CBC
/ˌsiː-biː-ˈsiː/
n. “Chaining blocks like a linked chain of trust.”
CBC, or Cipher Block Chaining, is a mode of operation for block ciphers used in cryptography. It was designed to improve the security of block cipher encryption by ensuring that each block of plaintext is combined with the previous ciphertext block before being encrypted. This creates a “chain” effect where the encryption of each block depends on all previous blocks, making patterns in the plaintext less discernible in the ciphertext.