What does the encryption and decryption process of block ciphers involve?
Understand the Problem
The question is asking about the process of encryption and decryption specifically related to block ciphers, focusing on what methods and principles are applied in this technique.
Answer
Block ciphers encrypt and decrypt data in fixed-size blocks using a symmetric key and algorithm.
The encryption of block ciphers involves encrypting each block of plaintext separately using the cipher algorithm and a symmetric key, producing corresponding blocks of ciphertext. Decryption involves decrypting each block of ciphertext using the same algorithm and key to retrieve the original plaintext.
Answer for screen readers
The encryption of block ciphers involves encrypting each block of plaintext separately using the cipher algorithm and a symmetric key, producing corresponding blocks of ciphertext. Decryption involves decrypting each block of ciphertext using the same algorithm and key to retrieve the original plaintext.
More Information
Block ciphers are used to encrypt fixed-size blocks of data, usually 128 bits, following processes like substitution-permutation. They form a basic element in symmetric key encryption and rely heavily on strong algorithms like AES (Advanced Encryption Standard).
Tips
A common mistake is confusing block ciphers with stream ciphers, which encrypt data one bit or byte at a time rather than in blocks.
Sources
- What is Block Cipher? | ITU Online - ituonline.com
- Block Cipher - an overview | ScienceDirect Topics - sciencedirect.com
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