Encryption has a remarkably long and varied history.The invention of writing was apparently soon followed by a desire to conceal messages.One of the methods,was the simple substitution of numbers for letters,for example A = 1,B = 2,etc.This is an example of
A)a hashing algorithm.
B)symmetric key encryption.
C)asymmetric key encryption.
D)a public key.

Question

Quizplus · Accepted Answer

The method of substituting numbers for letters is an example of symmetric key encryption, where the same key is used for both encryption and decryption. Hashing algorithms are used for data integrity and do not involve encryption. Asymmetric key encryption and public keys involve the use of different keys for encryption and decryption.

Encryption Has a Remarkably Long and Varied History