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| Subject: | [CISSP-D] Work factor of Birthday attacks |
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| Date: | Tue, 26 Jul 2005 07:11:24 +0100 |
Hello all, In Cryptographic Domain: Can someone please explain the following: MD5 produces a 128 bit digest. Birthday attacks mounted against MD5 use only (128/2) 64 bit (2 to the power of 64 possibilities) SHA-1 produces a 160 bit digest. Birthday attacks mounted against SHA use only (160/2) 80 bit (2 to the power of 80 possibilities) Question is: Why 64 bits & 80 bits ??? Regards Rami
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