An Introduction to Cryptography

January 15, 2002

Practical Aspects of Modern Cryptography

A Cryptographic Hash: SHA-1

What’s in the final 32-bit transform?

•Take the rightmost word.

•Add in the leftmost word rotated 5 bits.

•Add in a round-dependent function f of the middle three words.

•Add in a round-dependent constant.

•Add in a portion of the 512-bit message.