Mercy (cipher)
978-613-2-94580-8
6132945806
136
2010-09-09
45.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In cryptography, Mercy is a tweakable block cipher designed by Paul Crowley for disk encryption. The block size is 4096 bits—unusually large for a block cipher, but a standard disk sector size. Mercy uses a 128-bit secret key, along with a 128-bit non-secret tweak for each block. In disk encryption, the sector number would be used as a tweak. Mercy uses a 6-round Feistel network structure with partial key whitening. The round function uses a key-dependent state machine which borrows some structure from the stream cipher WAKE, with key-dependent S-boxes based on the Nyberg S-boxes also used in AES. Scott Fluhrer has discovered a differential attack that works against the full 6 rounds of Mercy. This attack can even be extended to a seven-round variant.
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