Re: secure replacements for passwords


J. Spencer Love (JSLove@MIT-MULTICS.ARPA)
Sun, 1 Mar 87 00:41 EST


    Date: 18 January 1987 15:57 est
    From: The Matt Crawford of net.* <matt at ODDJOB.UCHICAGO.EDU>
    Subject: Re: secure replacements for passwords

    J. Spencer Love writes:
    ) I don't know about your TCP, but the Multics TCP will send a RST
    ) immediately if it receives a packet with an ACK that is too high. I
    ) believe that this is clearly spelled out in the specification, but I am
    ) at home and don't have the specification handy.

    Nope, RFC-793 says "If the ACK acks something not yet sent
    (SEG.ACK > SND.NXT) then send an ACK, drop the segment, and
    return.

Thank you for pointing this out. I'm sorry that this reply is so
delayed.

The Multics TCP does, in fact, behave as I claimed. I have examined
RFC-793, and the sentence which Matt Crawford quoted is on page 72 (page



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