Substitution-Permutation Networks (SPN) are often used to construct an iterative block cipher. In an iterative block cipher, an input plaintext block goes through several rounds. In each round, separate round keys are used. In a Substitution-Permutation Network (SPN),...
RC4 is a stream cipher. It was designed by Ron Rivest in 1987. The algorithm is well-known for its simplicity and speed in software. In our previous article, we discussed how the RC4 algorithm works. In this article, we would discuss how to implement the RC4 algorithm...
RC4 is a stream cipher that was designed by Ron Rivest in 1987. This cipher is well-known for its simplicity and speed in software. RC4 is used in many protocols like WEP, WPA, Microsoft Point-to-Point encryption, etc. It was once used in protocols like TLS also. But,...
What is a Feistel cipher? While constructing a block cipher, we often use a Feistel cipher. A Feistel cipher is a structure that is used to construct a block cipher. It is named after the cryptographer Horst Feistel. A Feistel cipher is also known as a Feistel...
If the same block of plaintext is encrypted again and again with the same key, it should not produce the same ciphertext block. If it does, then attackers can easily analyze the ciphertext and get information about the plaintext. To address the problem we use block...
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