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: [EMAIL PROTECTED] _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
