CiphersCiphers are the algorithms used to encrypt and decrypt data. They fall into two main categories: block ciphers and stream ciphers. The method by which block ciphers handle data is influenced by different modes of operation. Below is an overview of each type, how they differ, and details on AES-GCM, a popular mode of operation for block ciphers.1. Block Ciphers vs. Stream CiphersBlock Ciph..