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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >>>>> "Ben" == Ben <orinjus@xxxxxxxxx> writes: Ben> Maybe this is the wrong place for this question, but here goes: Ben> Say I have some data d. I have a symmetric block cipher like Ben> Blowfish that encrypts the data such that e = b(d, k) with k Ben> being the key, d the original data, and e the encrypted data. Ben> Now I have a hash function like SHA that takes the hash of the Ben> encrypted data like this h = s(e) or h = s(b(d, k)). Now, Ben> assuming that an attacker can see only the data (d) and the hash Ben> of the encrypted data (h or s(b(d, k))). Would my key (k) be Ben> secure? Looks like. Is this a MAC? If so there are constructions as secure as this but more useful. - -- Casey Marshall || rsdio@xxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) Comment: Processed by Mailcrypt 3.5.7 <http://mailcrypt.sourceforge.net/> iD8DBQFAI5WEgAuWMgRGsWsRAj0DAJ4tXOVIrP67iH7Bb9mpYjsyy5Hq6QCeKm4Y NiPaUPfeb4mjkXKJ+COuK5M= =0upZ -----END PGP SIGNATURE----- _______________________________________________ gnu-crypto-discuss mailing list gnu-crypto-discuss@xxxxxxxxxx http://mail.nongnu.org/mailman/listinfo/gnu-crypto-discuss
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