1 . 1 . The Caesar Cipher is our first historical cryptosystem and has numerous flaws. (...
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1. The Caesar Cipher is our first historical cryptosystem and has numerous flaws.
(a) Decrypt the Caesar Cipher ciphertext: IT STY ZXJ RJ YT JSHWDUY DTZW UFXXBTWI
(b) The Caesar Cipher has an inadequate keyspace. What other problems does it have that make it insecure?
(c) The Caesar Cipher is often described as having a fixed shift of three positions. Explain why in this case, the Caesar Cipher is not really a cryptosystem at all.
(d) Is ROT13 a cryptosystem?
2. Describe Playfair Cipher (limit your answer to 50 words).
3. Describe Vigenre Cipher (limit your answer to 50 words).
4. R and Q appear as one−letter words in a cryptogram. R has frequency 7, and Q has frequency 3. Which ciphertext letter is likely to be the substitute for a, and which is likely to be the substitute for i? Explain your reasoning.
5. The two−letter word KC appears in a cryptogram. K has frequency 5, and C has frequency 2. One of K and C is a consonant, and the other is a vowel. Which is likely to be which? Explain your reasoning.
6. BKKL appears in a cryptogram. What are some possible plaintext words for this four−letter encrypted word?
Related Book For
Java How To Program Late Objects Version
ISBN: 9780136123712
8th Edition
Authors: Paul Deitel, Deitel & Associates
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