Martin H. Ackroyd

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[ 131 Data Encryption Standard, Federal Information Processing Standard (FIPS) Publication 46, National Bureau of Standards, US Dept. of Commerce, Washington, DC, 1977. i) No solutions exist when L =4a + 1, a > 1. (L = 3 gives well-known Huffman sequences and is a special case.) ii) For L-7, there is a class of integer Huffman sequences given by (1, 2m,(More)
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