Serious Cryptography by Jean-Philippe Aumasson
Author:Jean-Philippe Aumasson
Language: eng
Format: epub, mobi, pdf
Publisher: No Starch Press, Inc.
Published: 2016-12-01T05:00:00+00:00
How SipHash Works
SipHash uses a trick that makes it more secure than basic sponge functions: instead of XORing message blocks only once before the permutation, SipHash XORs them before and after the permutation, as shown in Figure 7-5. The 128-bit key of SipHash is seen as two 64-bit words, K1 and K2, XORed to a 256-bit fixed initial state that is seen as four 64-bit words. Next, the keys are discarded, and computing SipHash boils down to iterating through a core function called SipRound and then XORing message chunks to modify the four-word internal state. Finally, SipHash returns a 64-bit tag by XORing the four-state words together.
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