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Subject: BIP150/151 concerns and some comments
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Hi
Recently I read some concerns about BIP150/151 and its =E2=80=9Eidentity =
system=E2=80=9C.
I think we should take those concerns seriously and I wrote some
comments for some of the concerns I'm aware of. In my opinion, most of
these worries are unfounded.
Concern 1: BIP150 introduces a identity system that could partition the
network
#########################################################################=
######
- Users already filtering/authenticate peers by IP tables, =E2=80=9Eaddno=
de=E2=80=9C
command, peer banning in app-layer. Fast block relay is a good example
(example: FIBRE).
- BIP150 allows to switch from IP based authentication (which is
obviously not ideal) to a secure form of authentication with pre-shared
keys (ECDH).
- We can=E2=80=99t stop peer operators to selectively manage peers and th=
ere are
valid reasons to do that
Concern 2: But BIP150 makes it simpler and increase the risk of network
partitioning
#########################################################################=
###########
- What is simpler, presharing a pubkey over a secure channel (PGP /
Signal) and store in on both peers or calling a =E2=80=9Eaddnode <ip>=E2=80=
=9C, or
=E2=80=9Eiptables-DROP <ip>=E2=80=9C?
Concern 3: Identity is not something we want in Bitcoin
#######################################################
- BIP150 introduces an **optional** authentication over a EC pubkey. The
EC pubkey can be changed. It=E2=80=99s different per network interface. Y=
ou only
reveal it to peers that already have proven the know your identity.
- IP addresses are also a form of identity and way more inflexible and
different to hide.
Concern 4: But peers can fingerprint my node and ban me after BIP150 has
been deployed
#########################################################################=
#############
- They can=E2=80=99t fingerprint you over BIP150 messages, it does not re=
veal
your identity unless the responding peer has proven he knows your identit=
y.
Concern 5: BIP150/151 is not necessary, we have already Tor and STunnel,
etc.
#########################################################################=
####
- Tor is an alternative, right. But do we want to depend on those
technologies? Using tor for a single secure channel seems like using
a sledgehammer to crack a nut.
- How many SPV users have encrypted channels to trusted nodes today? Is
it accessible for the novice user?=20
- Peer operators who depend on designated connections (with addnode),
what security do they have today (IP address, really?)?
- I think tor is great, it can be an alternative or an additional
security enhancement (encrypt twice). IMO the focus of Tor is not on
securing single channels (it's rather onion routing / anonymity).
=20
Concern 6: BIP151 gives a false sense of security and has no MITM detecti=
on
#########################################################################=
##
- BIP151 (pure encryption) has no MITM detection, correct.
- Without BIP151 encryption, everyone can hook into the stream and read
what=E2=80=99s going on. With BIP151, an attacker needs to actively subst=
itute
ephemeral keys in both direction. This attack is A) more complex to
achieve and B) it=E2=80=99s an active attack (no excuse of =E2=80=9EI jus=
t made some
statistics=E2=80=9C), C) it requires the attacker to accept the risk of b=
eing
detected.
- C) is true because an optional authentication (can be BIP150 or
different) would reveal the attack.
- Some attacks are worthless if you have to take the risk mentioned in C)=
=20
Concern 7: But Bitcoin traffic is trustless, why the hell you want to
encrypt it?
#########################################################################=
########
- If you use one of the todays available SPV clients, you will reveal
your complete wallet content (=E2=80=9E~all your addresses") to every net=
work
observer between you and the node you have connected to. This means, if
you pay for a coffee (while being on the owners WIFI), the coffee owner
and all the involved ISPs can correlate your wallet with your other
internet behavior. Same is true for your cellphone provider if you use
cellular.
- They still can, if you don=E2=80=99t have a trusted node, by performing=
the
attack that involves the risk mentioned in Concern 6.
=20
Concern 8: If you want to have a light client, you should use a
different channel to communicate with your full node then the p2p layer
#########################################################################=
##############################################################
- From a design perspective, this could make sense
- From an end user=E2=80=99s perspective, this is undesirable (enabled di=
fferent
port, lack of a (RPC / ZMQ, etc.) standard, no fallback option if the
trusted node is down, hard to setup)
- Using the p2p channel as the todays SPV do, seems very reasonable to
me. Keep the users on the p2p layer! If we don=E2=80=99t want the users o=
n that
channel, we automatically form a different layer, the wallet-com wild-wes=
t.
- Keeping the users on the p2p layer also allows future changes where
they can help the network in some ways.
- Using the p2p layer for a trusted connection also allows to fallback
anytime to non-trusted nodes (if your trusted node is no longer
reachable). If your SPV peer needs to catch up a couple of hours while
your trusted peer was done, fine, download full blocks or change your
bloom filters FP rate significant (or sacrifices your privacy in this cas=
e).
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table List 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table List 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table List 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table List 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table 3D effects 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table 3D effects 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table 3D effects 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Contemporary"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Elegant"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Professional"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Subtle 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Subtle 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Web 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Web 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Web 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Balloon Text"/>
<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Table Theme"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"=
true"
Name=3D"Note Level 9"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholde=
r Text"/>
<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" Name=3D=
"No Spacing"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading"=
/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1"=
/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2"=
/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1"=
/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2"=
/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3"=
/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List"=
/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid"=
/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Acc=
ent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Acc=
ent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/=
>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true"
Name=3D"List Paragraph"/>
<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" Name=3D=
"Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true"
Name=3D"Intense Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Acce=
nt 1"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Acc=
ent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Acc=
ent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Acc=
ent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Acc=
ent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Acce=
nt 3"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Acc=
ent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Acc=
ent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Acce=
nt 4"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Acc=
ent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Acc=
ent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Acce=
nt 5"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Acc=
ent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Acc=
ent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading=
1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading=
2 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Acce=
nt 6"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shadi=
ng Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"19" QFormat=3D"true"
Name=3D"Subtle Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"21" QFormat=3D"true"
Name=3D"Intense Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"31" QFormat=3D"true"
Name=3D"Subtle Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"32" QFormat=3D"true"
Name=3D"Intense Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"33" QFormat=3D"true" Name=3D=
"Book Title"/>
<w:LsdException Locked=3D"false" Priority=3D"37" SemiHidden=3D"true"
UnhideWhenUsed=3D"true" Name=3D"Bibliography"/>
<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true"
UnhideWhenUsed=3D"true" QFormat=3D"true" Name=3D"TOC Heading"/>
<w:LsdException Locked=3D"false" Priority=3D"41" Name=3D"Plain Table 1"=
/>
<w:LsdException Locked=3D"false" Priority=3D"42" Name=3D"Plain Table 2"=
/>
<w:LsdException Locked=3D"false" Priority=3D"43" Name=3D"Plain Table 3"=
/>
<w:LsdException Locked=3D"false" Priority=3D"44" Name=3D"Plain Table 4"=
/>
<w:LsdException Locked=3D"false" Priority=3D"45" Name=3D"Plain Table 5"=
/>
<w:LsdException Locked=3D"false" Priority=3D"40" Name=3D"Grid Table Lig=
ht"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 L=
ight"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2"/=
>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3"/=
>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4"/=
>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 C=
olorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 C=
olorful"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"Grid Table 1 Light Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51"
Name=3D"Grid Table 6 Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52"
Name=3D"Grid Table 7 Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"Grid Table 1 Light Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 A=
ccent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 A=
ccent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 A=
ccent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51"
Name=3D"Grid Table 6 Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52"
Name=3D"Grid Table 7 Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"Grid Table 1 Light Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 A=
ccent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 A=
ccent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 A=
ccent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"51"
Name=3D"Grid Table 6 Colorful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"52"
Name=3D"Grid Table 7 Colorful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"Grid Table 1 Light Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 A=
ccent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 A=
ccent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 A=
ccent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"51"
Name=3D"Grid Table 6 Colorful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"52"
Name=3D"Grid Table 7 Colorful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"Grid Table 1 Light Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 A=
ccent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 A=
ccent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 A=
ccent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"51"
Name=3D"Grid Table 6 Colorful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"52"
Name=3D"Grid Table 7 Colorful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"Grid Table 1 Light Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 A=
ccent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 D=
ark Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"51"
Name=3D"Grid Table 6 Colorful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"52"
Name=3D"Grid Table 7 Colorful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 L=
ight"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2"/=
>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3"/=
>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4"/=
>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 D=
ark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 C=
olorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 C=
olorful"/>
<w:LsdException Locked=3D"false" Priority=3D"46"
Name=3D"List Table 1 Light Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4 A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 D=
ark Accent 1"/>
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<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">Hi<br>
<br>
Recently I read some concerns about BIP150/151 and its
=E2=80=9Eidentity system=E2=80=9C.<br>
I think we should take those concerns seriously and I wrote
some comments for some of the concerns I'm aware of. In my
opinion, most of
these=C2=A0worries=C2=A0are=C2=A0unfounded.</span></tt><tt><o:p=
></o:p></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><br>
Concern 1: BIP150 introduces a identity system that could
partition the network</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">################################################=
###############################<br>
</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">
- Users already filtering/authenticate peers by IP tables,
=E2=80=9Eaddnode=E2=80=9C command,
peer banning in app-layer. Fast block relay is a good example
(example: FIBRE).<br>
- BIP150 allows to switch from IP based authentication (which
is obviously not
ideal) to a secure form of authentication with pre-shared keys
(ECDH).<br>
- We can=E2=80=99t stop peer operators to selectively manage pe=
ers and
there are valid
reasons to do that<br>
<br>
Concern 2: But BIP150 makes it simpler and increase the risk
of network
partitioning</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US">############################################=
########################################</span></tt></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US"></span></tt>
- What is simpler, presharing a pubkey over a secure channel
(PGP / Signal) and
store in on both peers or calling a =E2=80=9Eaddnode <ip>=
=E2=80=9C, or
=E2=80=9Eiptables-DROP
<ip>=E2=80=9C?<br>
<br>
Concern 3: Identity is not something we want in Bitcoin</span><=
/tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US">############################################=
###########</span></tt></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US"></span></tt>
- BIP150 introduces an **optional** authentication over a EC
pubkey. The EC
pubkey can be changed. It=E2=80=99s different per network inter=
face.
You only reveal it
to peers that already have=C2=A0proven the know your identity.<=
br>
- IP addresses are also a form of identity and way more
inflexible and
different to hide.</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><br>
Concern 4: But peers can fingerprint my node and ban me after
BIP150 has been
deployed</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US">############################################=
##########################################</span></tt></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US"></span></tt>
- They can=E2=80=99t fingerprint you over BIP150 messages, it d=
oes not
reveal your
identity unless the responding peer has proven he knows your
identity.</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">
<br>
Concern 5: BIP150/151 is not necessary, we have already Tor
and STunnel, etc.</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US">############################################=
#################################</span></tt></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><tt><span style=3D"font-size: 9pt; color: black;=
"
lang=3D"EN-US"></span></tt>
- Tor is an alternative, right. But do we want to depend on
those technologies? Using tor for a single
secure channel seems like using a=C2=A0sledgehammer to crack a =
nut.<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- How many SPV
users have encrypted channels to trusted nodes today? Is it
accessible for the
novice user?=C2=A0<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- Peer operators
who depend on designated connections (with addnode), what
security do they have
today (IP address, really?)?<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- I think tor is
great, it can be an alternative or an additional security
enhancement (encrypt
twice). IMO the focus of Tor is not on securing single
channels (it's rather onion routing / anonymity).<o:p></o:p></s=
pan></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><o:p>=C2=A0</o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">Concern 6: BIP151
gives a false sense of security and has no MITM detection</span=
></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">################################################=
###########################</span></tt><br>
<tt><span style=3D"font-size: 9pt; color: black;" lang=3D"EN-US"><o=
:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- BIP151 (pure
encryption) has no MITM detection, correct.<o:p></o:p></span></=
tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- Without BIP151
encryption, everyone can hook into the stream and read what=E2=80=
=99s
going on. With
BIP151, an attacker needs to actively substitute ephemeral
keys in both
direction. This attack is A) more complex to achieve and B)
it=E2=80=99s an active
attack (no excuse of =E2=80=9EI just made some statistics=E2=80=
=9C), C) it
requires the
attacker to accept the risk of being detected.<o:p></o:p></span=
></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- C) is true
because an optional authentication (can be BIP150 or
different) would reveal
the attack.<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- Some attacks are
worthless if you have to take the risk mentioned in C)<o:p></o:=
p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><o:p>=C2=A0</o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">Concern 7: But
Bitcoin traffic is trustless, why the hell you want to encrypt
it?</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">################################################=
#################################</span></tt><br>
<tt><span style=3D"font-size: 9pt; color: black;" lang=3D"EN-US"><o=
:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- If you use one
of the todays available SPV clients, you will reveal your
complete wallet
content (=E2=80=9E~all your addresses") to every network observ=
er
between you and
the node you have connected to. This means, if you pay for a
coffee (while
being on the owners WIFI), the coffee owner and all the
involved ISPs can
correlate your wallet with your other internet behavior. Same
is true for your
cellphone provider if you use cellular.<o:p></o:p></span></tt><=
/p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- They still can,
if you don=E2=80=99t have a trusted node, by performing the att=
ack
that involves the
risk mentioned in Concern 6.<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><o:p>=C2=A0</o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">Concern 8: If you
want to have a light client, you should use a different
channel to communicate
with your full node then the p2p layer</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">################################################=
#########################################################################=
##############</span></tt><br>
<tt><span style=3D"font-size: 9pt; color: black;" lang=3D"EN-US"><o=
:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- From a design
perspective, this could make sense<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- From an end user=E2=80=99s
perspective, this is undesirable (enabled different port, lack
of a (RPC / ZMQ,
etc.) standard, no fallback option if the trusted node is
down, hard to setup)<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- Using the p2p
channel as the todays SPV do, seems very reasonable to me.
Keep the users on
the p2p layer! If we don=E2=80=99t want the users on that chann=
el, we
automatically
form a different layer, the wallet-com wild-west.<o:p></o:p></s=
pan></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- Keeping the
users on the p2p layer also allows future changes where they
can help the
network in some ways.<o:p></o:p></span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US">- Using the p2p
layer for a trusted connection also allows to fallback anytime
to non-trusted
nodes (if your trusted node is no longer reachable). If your
SPV peer needs to
catch up a couple of hours while your trusted peer was done,
fine, download
full blocks or change your bloom filters FP rate significant
(or sacrifices
your privacy in this case).</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><br>
</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"><br>
</span></tt></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size: 9pt; color: blac=
k;"
lang=3D"EN-US"></jonas><br>
</span></tt>
</p>
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