full-disclosure - Time Expiry Alogorithm??

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From: gautam.singh at gmail.com (Gautam R. Singh)
Subject: Time Expiry Alogorithm??

Thanks list for the good discussion, now I going back to read crypto basics :) 

Thanks & regards,
Gautam


> Yo Gautum!
> 
> On Fri, 19 Nov 2004, Gautam R. Singh wrote:
> 
> > I was just wondering is there any encrytpion alogortim which expires wit
> > h time.
> 
> IPSec, kerboros, etc. all use time as part of the auto-generated session
> key to prevent playback attacks.
> 
> If a black hat has an intercepted message he wants to decode then he can
> set his clock to anything he wants to.  Time is no help there, except
> to expand the key search space if they are looking for an unknown key.
> If they have the key already nothing you can do if they can reset their
> clock.
> 
> All that time gets you is protection from replays.
> 
> RGDS
> GARY
 


-- 
Gautam R. Singh
[MCP, CCNA, CSPFA, SA1 Unemployed] pgp:
http://gautam.techwhack.com/key/ | ymsgr: er-333 | msn: ro0_@...mail