Symmetric Encryption

If the same key is used to encrypt and decrypt a message, this is known as? 

• Symmetric encryption
• Encryption doesn't exist!
• Asymmetric encryption
• Same-key encryption

hello has been encrypted with Caesar cipher to khoor. The key used was:

• abc
• 3
• 2
• alphabet mapping table

The key for a random substitution cipher is 

• a number
• an alphanumeric string
• a mapping of the letters of the alphabet to other letters
• two keys, a public and a private

The process of converting plaintext to ciphertext.

• cryptography

• cyphertext

• decryption

• encryption

Information that is readable without performing any cryptographic operations.

• cryptography

• plaintext

• encryption

• decryption

Information that is readable without performing any cryptographic operations.

• cryptography

• plaintext

• encryption

• decryption

A string of text that has been converted to a secure form using encryption.

• encryption

• decryption

• ciphertext

• plaintext

The process of converting a ciphertext into plaintext.

• encryption

• decryption

• plaintext

• cryptography

A method of encryption and decryption in which each letter in the alphabet is replaced by another.

• encryption

• decryption

• substitution cypher

• plaintext

A method for determining a solution to a problem by sequentially testing all possible solutions.

• brute force

• relative frequency

• cipher

• paired keys