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Article #1587Re: pseudo one time pad...
From: Steven Bellovin
Date: Thu, 12 Nov 1992 02:12
Date: Thu, 12 Nov 1992 02:12
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In article <1992Nov11.193848.10946@rchland.ibm.com>, lwloen@rchland.vnet.ibm.com (Larry Loen) writes: > I don't know exactly who has done what, > but I am sure something like that is out there. I recall, also, the > ANSI standard shows one possible way of doing something along this line. Yup, it's output feedback mode. You generate the pseudo-random key as follows: C[0] = DES(K, IV) C[n+1] = DES(K, C[n]) where K is the 56-bit DES key and IV is a 64-bit initial vector. The different modes of DES have different properties. I suggest reading Davies and Price's ``Security for Computer Networks'' for an excellent discussion of the topic.
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<1992Nov12.021258.15260@ulysses.att.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!bgsuvax!att!att!dptg!ulysses!ulysses!smbReferences:
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Newsgroups: sci.crypt Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!bgsuvax!att!att!dptg!ulysses!ulysses!smb From: smb@ulysses.att.com (Steven Bellovin) Subject: Re: pseudo one time pad... Message-ID: <1992Nov12.021258.15260@ulysses.att.com> Date: Thu, 12 Nov 1992 02:12:58 GMT References: <1992Nov11.173642.29608@ee.eng.ohio-state.edu> <1992Nov11.193848.10946@rchland.ibm.com> Organization: AT&T Bell Laboratories Lines: 16