AES or Advanced Encryption Standard is a symmetric encryption standard that is established by the US NIST (National Institute of Standards and Technology) in 2001. It is also a block cipher. It divides the input plaintext into several equal-sized blocks and then the...
In cryptography, the One Time Pad is an encryption technique in which a secret key of length more than or equal to that of the plaintext message is used to encrypt the message. The secret key is randomly generated and it is pre-shared with the communicating parties....
What is the Vigenere cipher? Let’s understand the Vigenere cipher with an example first. Let’s say the symbol size is 26 and we are encrypting English text. We are encrypting the plaintext “attackatdawn” with the key “road”. Firstly, we would map each letter of the...
What is the affine cipher? The affine cipher is a type of monoalphabetic substitution cipher. In the affine cipher, each letter of the plaintext is substituted with another letter from the alphabet. So, the affine cipher is a type of substitution cipher. And, in the...
In a transposition cipher, the ciphertext is a permutation of the plaintext. There are different types of transposition cipher. In a simple columnar transposition cipher, the plaintext is written row-wise in a table. The key is an integer that specifies the number of...
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