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By de Guyot-Guedon, Jean-Luc Syren

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In hash functions, we do not use a secret key to process the data. With these three kinds of algorithms, we achieve data confidentiality, data integrity, and data authentication. Symmetric Key Algorithms The examples for symmetric key algorithms are the advanced encryption standard (AES) and the triple data encryption algorithm (TDEA), and are used in most cryptographic applications for data encryption. 3 present more details about the TDEA and AES algorithms, simulations, and efficient implementation techniques.

2. Do not repeat the secret key when generating the S-Box of RC4. 3. Do not use RC4 for generating (or encrypting) lengthy data patterns. For more information on RC4 weaknesses, see Mister and Tavares (1998); Mantin and Shamir (2001); and Fluhrer, et al. (2001). 4 are also used for generating pseudorandom numbers. In the following, we discuss the complexity and simulation of RC4 as well as an efficient software implementation method for the RC4 encryption process. 4, the computation of new j value requires updated (swapped) S-Box values.

Perform S-Box mixing by combining eight look-up tables into a single big look-up table sb[ ] and accessing the corresponding 4-bit words with appropriate offsets. The look-up table sb[ ] values can be found on this book’s companion website. ). ). ). ) takes 32 bits of data as input and outputs 32 bits as permuted data. 16. 1) to perform the permutation operation. 4 Computational Complexity of DES Algorithm Most of the operations involved in the DES key scheduler, DES cipher and DES inverse cipher are bit operations rather than byte or word operations and consume more cycles to run DES on the reference embedded processor as we process all the data in terms of bits.

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