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Q. Show the Character-level Encryption?
- Substitutional
- Monoalphabetic - simplest form; also called Caesar cipher
- Every character is replaced with another character in the set
- Ke and Kd are the similar and define the added or subtracted value
- Can be broken easily; does not hide repetition
- Polyalphabetic - each occurrence can have a different substitute (ex. Vigenere)
- Based also on position of character in the text
- Frequencies are not preserved; more difficult to break than monoalphabetic
Q. Permutation representation through Matrix? Figure: Clos Network The functioning of this above permutation is displayed in Figure. This permutation is able to
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Q. Explain the Types of Security Service? Security Services fall into one of the subsequent categories - Confidentiality: Confirms that the info in a system and transm
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