Question

A ________ cipher replaces one character with another character. Select one:
a. Stream
b. Substitution
c. Transposition

Answer 1

Explanation:

Answer is B. Substitution

Answer 2

A Substitution cipher replaces one character with another character. Hence, option (b) is the correct option.

• A substitution cipher is an encrypting method in cryptography.

• In this method, plain text is substituted by ciphertext with the help of keys in a defined manner.

• The text which is replaced could be a single letter, word, or pair of words.

• The original message is extracted by receiver cipher by inverse substitution process.