Block ciphers

Block ciphers encrypt a fixed size (block) of data at a time. If you're sending a message and your computer is using a block cipher encryption algorithm, it would create blocks of a fixed size such as 64-bits or even 128-bits and encrypt all the data inside each block. Some examples of block cipher algorithms are: Data Encryption Standard, Triple Data Encryption Standard, and Advanced Encryption Standard, to name just a few.