Cryptology and Cryptography

The word cryptology is nowadays used for all schemes, or only all mathematical schemes, which enable parties who distrust each other or outsiders to cooperate in a useful way. For more types of cryptologic schemes than authentication and secrecy schemes, see, e.g, [Bras88, Schn96] or some subschemes in the later chapters of this text. Cryptography is sometimes regarded as a synonym and sometimes as more restricted, either to the construction of schemes (in contrast to cryptanalysis, for instance) or to secrecy schemes. 

Cryptography is the use of a cipher to represent hidden letters, words, or messages. Cryptology is the study of ciphers. Ciphers are not codes. Codes are used to represent a word or concept, and they do not have a hidden meaning. An example is the... 

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