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Network Security CISSP-Discussion
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[CISSP-D] Work factor of Birthday attacks

Subject: [CISSP-D] Work factor of Birthday attacks
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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