What is Cipher Block Chaining Process?
In a cipher block chaining process, data is encrypted in specific blocks and each block is dependent on the blocks before decryption. The process uses what is known as an initialization vector to link these blocks of encrypted data together.
Cipher block chaining was invented in 1976 and provides a consistent way to encrypt and decrypt large amounts of data. In a block encryption process, blocks of text are treated as isolated units that are encrypted and decrypted one after the other. An alternative is a stream cipher method in which each bit is processed independently.
In ciphertext block chaining, each block of ciphertext is decrypted in a process that requires observation of the blocks that have already been processed. The cipher block chaining process uses a logic gate called XOR to manage this observation process.
Cipher block chaining is often suggested as a stronger method of decryption to ensure quality. However, some experts warn of certain security flaws in cipher block blocking, including the use of predictable initialization vectors.