Download e-book for iPad: Coding for Data and Computer Communications by David Salomon

By David Salomon

ISBN-10: 0387212450

ISBN-13: 9780387212456

Details crucial suggestions used to make the garage and transmission of knowledge quick, safe, and reliable.

obtainable to either experts and nonspecialists: Avoids advanced arithmetic

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Additional info for Coding for Data and Computer Communications

Sample text

R16 for the C and D registers is equal to 28. This is no coincidence and at the end of an encryption the registers C and D are back at their initial state. The registers are ready for the next encryption. It is also interesting to note that the key schedule can be reversed for decryption, with the register rotations being applied in the opposite directions (to the right). There is a somewhat irregular appearance to the rotations by one or two bit positions. In particular it may seem odd that the rotation amount in the ninth round is 1.

The development of the Advanced Encryption Standard (AES) allowed the cryptographic community to take a major step forward in block cipher design. Just as DES trained a generation of cryptographers, the AES process provided a massive spur to the design, analysis, and implementation of block ciphers. Ironically, the establishment and standardisation of the AES tended to dampen, at least for a while, any new research on block cipher designs. While some researchers continued to analyse the AES, there was little real purpose (or indeed desire) to design alternative block ciphers.

2. Using bitwise exclusive-or the 48-bit intermediate value is combined with the round key. 3. The 48 bits that result are split into eight groups of six, and used as inputs to eight different S-boxes. Each S-box returns four bits which, when concatenated together, give a 32-bit intermediate quantity. 2 The bitwise expansion E and bitwise permutation P in DES. The tables should be interpreted as those for IP and IP−1 in that the first bit of the output of E is taken from the 32nd bit of the input while the first bit of the output of P is taken from the 16th bit of the input.

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Coding for Data and Computer Communications by David Salomon

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