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...
What is the Caesar Cipher? Caesar cipher is a widely known historical cipher. In this cipher, each letter from plaintext is replaced with another letter. And, the key determines how many positions down the alphabet the plaintext letter will be shifted. In other words,...
HMAC or Hash-based Message Authentication Code is used for verifying the data integrity and the authenticity of a message. It uses symmetric key cryptography. Using a hash algorithm and a symmetric secret key a Message Authentication Code or MAC is generated. The MAC...
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