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*To*: [email protected]*Subject*: Re: How long would it take?*From*: [email protected] (Scott Collins)*Date*: Wed, 11 Aug 1993 11:56:28 -0800*Cc*: [email protected], [email protected]

>How does your "Yes" wash with the next paragraph of your note? I'm sorry. My answer was misleading (read 'wrong'). What I was trying to say was: "Yes, but not in a reasonable amount of time." My implication was that an attack against RSA with a 1264 bit key and an attack against IDEA with a 128 bit key are both prohibitive, but that my _guess_ is that cryptanalysis of the IDEA cypher would be the more fruitful attack. If the real question is: "Am I safe from the NSA when I use PGP and encrypt with a 1264 bit key?" Then I must answer: "In my opinion, you are reasonably safe." If the question is: > Could the NSA reverse PGP encryption on a message that was encrypted with a > 1264 bit key? Then I must answer: "Yes, it is mathematically possible; although unlikely in the extreme." I apologize. >Sorry I didn't include more numbers, ...really sorry. They said what I meant. >And IDEA is not susceptible to diff.cryptan - that's the way >it was *designed* (actually the designer proved mathematically >the invinsibility of IDEA to this attack). Thanks for this info. I have been trying to get the IDEA papers: "Detailed Description and a Software Implementation of the IPES Cipher" "Markov Ciphers and Differential Cryptanalysis" without success, as yet. Perhaps you have them or know of an ftp site? Thanks, Scott Collins | "Few people realize what tremendous power there | is in one of these things." -- Willy Wonka ......................|................................................ BUSINESS. voice:408.862.0540 fax:974.6094 [email protected] Apple Computer, Inc. 1 Infinite Loop, MS 301-2C Cupertino, CA 95014 ....................................................................... PERSONAL. voice/fax:408.257.1746 1024/669687 [email protected]

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