Changing some part of the plain text for some matching part of cipher text. Historical algorithms typically use this.

Changing some part of the plain text for some matching part of cipher text. Historical algorithms typically use this.
A . Decoding
B. Substitution
C. Transposition
D. Collision

View Answer

Answer: B

Explanation:

Substitution

https://en.wikipedia.org/wiki/Substitution_cipher

In cryptography, a substitution cipher is a method of encrypting by which units of plaintext are replaced with ciphertext, according to a fixed system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing the inverse substitution.