Multiple choice

Which of the following is a method of encryption by which units of plain text are substituted with cipher text according to a regular system?

  1. Substitution cipher technique

  2. Transposition cipher technique

  3. Block cipher technique

  4. Stream cipher technique

  5. Cipher text

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A Correct answer
Explanation

Substitution cipher is a method of encryption by which units of plain text are substituted with cipher text according to a regular system.