Cryptography- Computer Security

Q1- Monoalphabetic Substitution Ciphers

1. choosing a keyword,
2. removing all duplicate letters from the keyword
3. start the cipher-alphabet with the letters from duplicate-free keyword
4. at the end of the codeword continue with the next unused letter of the alphabet that follows the last
letter in the codeword
5. continue filling in letters in alphabetical order leaving out those letters already used; if necessary,
start from the beginning of the alphabet again similar to a shift cipher

Q3- Feistel Ciphers

Q4: one time is not correct but tow time is correct. how?


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