Cipher Block Chaining

Cipher Block Chaining (CBC) is a method of encrypting data so that each message block depends on the previous one, enhancing security. It works by combining (XORing) the first data block with an initial secret value (called an initialization vector), then encrypting it. The encrypted output is used to transform the next data block in the same way, and so on. This chaining ensures that similar data blocks produce different ciphertexts, making it harder for attackers to analyze or predict the original content. CBC is commonly used to securely protect data in various communication systems.