Symmetric Round Ciphers
The symmetric round encryption scheme key remains constant for both the encrypting as well as the decrypting. It is one of the most efficient and well-adapted methods for encrypting a large amount of data within a short period. Key examples include:
- Data Encryption Standard (DES): One of the early block cipher that adopts a block size of 64-bit and 56-bit keys that functions round by round for sixteen rounds. Indeed, DES is no longer widely used because of its comparatively short key length, although it has been largely bolstered by other more secure algorithms.
- Advanced Encryption Standard (AES): It is implemented broadly today because of its effectiveness and compared to the capability based on AES. It is designed to work with 128, 192, or 256-bit keys and it processes 128-bit data blocks in 10, 12, or 14 rounds depending upon the key size selected.
- Blowfish: A variable key size (32-448 bits) symmetric cipher, working in 64-bit blocks with 16 rounds, developed by B. Preneel in 1994. It is fast and efficient and has some advanced features that many people are using.
What is Round Cipher?
Round ciphers are also known as block ciphers, and they are a classification of encryption algorithms that work systematically, converting the plaintext into ciphertext. These algorithms work on a limited number of bits at a time and subject them to a set of mathematical processes called rounds which are used to bring about the act of encryption. It continually becomes progressively more rigid to attack the data without the correct key, each round is added to the security of the data. These are the operation sequences of a round that include substitution, permutation, key mixing, and input data.
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