Question

A bank is using a=13 and b=8 in affine cipher to encrypt all pin numbers and send to a customer. A customer received a cipher text 6. What is the plain text pin number ?

Answer 1

Explanation: A stream cipher is a type of symmetric encryption algorithm that operates on continuous streams of plain text and is appropriate for hardware-based encryption. The Stream ciphers can be designed to be exceptionally fast, much faster than any block cipher. It is generates w is called a keystream . It is more secured and stronger. Stream ciphers can be viewed as approximating the action of a proven unbreakable cipher, the one-time pad (OTP), sometimes known as the Vernam cipher. A one-time pad uses a keystream of completely random digits. It is combined with the plaintext digits one at a time to form the ciphertext .