FUNDAMENTALS OF COMPUTER

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COMPUTER THREATS SECURITY

TYPES OF NETWORK SECURITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A(n) ____ is a keyless substitution cipher with N inputs and M outputs that uses a table to define the relationship between the input
A
S-box
B
P-box
C
T-box
D
None of the ementioned
Explanation: 

Detailed explanation-1: -a) Symmetric encryption: The same key is shared between the Sender and the Receiver and it is used to encrypt and decrypt the message.

Detailed explanation-2: -The sender uses a public key to encrypt the message. The recipient uses its private key to decrypt the message. Asymmetric encryption is also called public-key encryption, but it actually relies on a key pair.

Detailed explanation-3: -The shift cipher is the simplest mono-alphabetic cipher. it uses modular arithmetic with a modulus of 26.

Detailed explanation-4: -Transposition ciphers reorder units of plaintext (typically characters or groups of characters) according to a regular system to produce a ciphertext which is a permutation of the plaintext.

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