diff options
Diffstat (limited to 'proposals/222-remove-client-timestamps.txt')
| -rw-r--r-- | proposals/222-remove-client-timestamps.txt | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/proposals/222-remove-client-timestamps.txt b/proposals/222-remove-client-timestamps.txt index dd84bf2..7cd9cc5 100644 --- a/proposals/222-remove-client-timestamps.txt +++ b/proposals/222-remove-client-timestamps.txt @@ -3,7 +3,8 @@ Title: Stop sending client timestamps Authors: Nick Mathewson Created: 22 August 2013 Target: 0.2.5.x -Status: Open +Status: Closed +Implemented-In: 0.2.4.?? 0. Summary @@ -46,12 +47,14 @@ Status: Open The AUTHENTICATE cell is not ordinarily sent by clients. It contains an 8-byte timestamp and a 16-byte random value. - Instead, let's replace both with a 24-byte (truncated) HMAC of - the current time, using a random key. + Instead, let's just send 24 bytes or random value. - This will achieve the goal of including a timestamp in the - cell (preventing replays even in the presence of bad entropy), - while at the same time not including the time here. + (An earlier version of this proposal suggested that we replace + them both with a 24-byte (truncated) HMAC of the current time, + using a random key, in an attempt to retain the allegedly + desirable property of avoiding nonce duplication in the event of + a bad RNG. But really, a Tor process with a bad RNG is not going + to get security in any case, so let's KISS.) 2.3. TLS @@ -89,7 +92,7 @@ Status: Open Hidden service descriptors include a publication time. I propose that we round this time down to the nearest N minutes, - perhaps for N=30. + where N=60. 4.2. INTRODUCE2 cell timestamp @@ -102,8 +105,12 @@ Status: Open 0.2.2.x (and really, no hidden services should be running on 0.2.2.x!), we can simply send 0 instead. (See ticket #7803). - This might be a good place to use a consensus parameter, so - that a large number of clients switch at the same time. + We can control this behavior with a consensus parameter + (Support022HiddenServices) and a tristate (0/1/auto) torrc option of + the same name. + + When the timestamp is not completely disabled, it should be + rounded to the closest 10 minutes. I claim this would be suitable for backport to 0.2.4. |