Unformatted text preview: The ciphertext “USAXCYKUSAPNUCOQMHIJESXKYHVS” was produced by a Vigenere cipher. What is the likely key length? 6. Vigenere cipher is a polyalphabetic cipher that uses multiple Cesar ciphers. Design a polyalphabetic cipher that uses multiple Playfair ciphers. 7. Do Problem 2.20 on the 5 th edition (or 2.21 on the 4 th edition) of Stallings. This question is about steganography. The key is a sequence of singledigit integers, namely 7, 8, 7, 6, 5, 6, 5, 4, … Hint: what do these singledigit integers indicate?...
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 Spring '10
 TenH.Lai
 Cryptography, Encryption, Ciphertext

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