Security impact of removing timestamp check in rd_rep()

Sam Hartman hartmans at
Sun May 15 21:04:55 GMT 2005

>>>>> "Luke" == Luke Howard <lukeh at PADL.COM> writes:

    Luke> You actually want to check that they are different, to avoid
    Luke> replay attacks.

But you need to store all the timestamps you have seen in an allowable

Really, I don't understand why you use a timestamp in a three-leg
protocol.  It seems like you want to have a challenge in the second
leg copied back in the third leg encrypted in a per-session key.
However it sounds like DCE did not do this.


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