January 15, 2002
Practical Aspects of Modern
Cryptography
A Cryptographic Hash: SHA-1
Depending on the round, the “non-linear” function f is one of the following.
f(X,Y,Z)
= (XÙY) Ú ((ØX)ÙZ)
f(X,Y,Z)
= (XÙY) Ú (XÙZ) Ú (YÙZ)
f(X,Y,Z)
= X Å Y Å Z