Date: Mon, 3 May 1999 02:05:30 -0400 From: "Allen Smith" <easmith@beatrice.rutgers.edu> To: Robert Watson <robert@cyrus.watson.org>, 0x1c <nick@shibumi.feralmonkey.org> Cc: freebsd-security@FreeBSD.ORG Subject: Re: Blowfish/Twofish Message-ID: <9905030205.ZM6442@beatrice.rutgers.edu> In-Reply-To: Robert Watson <robert@cyrus.watson.org> "Re: Blowfish/Twofish" (May 3, 1:58am) References: <Pine.BSF.3.96.990503020707.5183L-100000@fledge.watson.org>
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On May 3, 1:58am, Robert Watson (possibly) wrote: > > I don't believe so, as long as they are not just crypto algorithms. I.e., > I believe our DES hashing is not exportable, whereas our MD5 hashing is. > In a sense, it's all a matter of perspective on how you use an algorithm. > It's all just mathematics, right? Sort of like you can't patent > mathematical formulas, but you can patent algorithms. :) So SHA-1 support > for FreeBSD would be quite exportable, I'd imagine, and would probably > make a worthwhile addition. I don't see Blowfish as a great addition > other than the interoperability concerns expressed previously. > On Mon, 3 May 1999, 0x1c wrote: > > > On a similar note, is there any restriction on one-way hashing algorithms? > > I forget. > > > > Nick One can use any cryptographically secure one-way hash function as a (secret key) encryption method. The procedure is as follows: Sender and recipient have shared secret key K. They want to transmit information I. Sender takes three-bit chunks (the most efficient size) of information I, finds a random salt S of sufficient size for each chunk, and does: hash(K S I-chunk) then sends the result and the random salt to the recipient. Recipient then looks for the 2-bit combination that hashed as above along with the secret and the key gives the result. -Allen -- Allen Smith easmith@beatrice.rutgers.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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