the science or study of the techniques of secret writing, especially code and cipher systems, methods, and the like. Compare cryptanalysis ( def 2 ).
the procedures, processes, methods, etc., of making and using secret writing, as codes or ciphers.
anything written in a secret code, cipher, or the like.

1635–45; crypto- + -graphy

cryptographer, cryptographist, noun
cryptographic [krip-tuh-graf-ik] , cryptographical, cryptographal, adjective
cryptographically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cryptography or cryptology (krɪpˈtɒɡrəfɪ, krɪpˈtɒlədʒɪ)
the science or study of analysing and deciphering codes, ciphers, etc; cryptanalysis
cryptology or cryptology
cryp'tographer or cryptology
cryp'tographist or cryptology
cryp'tologist or cryptology
cryptographic or cryptology
crypto'graphical or cryptology
crypto'graphically or cryptology

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1650s, from Mod.L. cryptographia, from Gk. kryptos "hidden" + graphia "writing."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

cryptography definition

The science of coding and decoding messages so as to keep these messages secure. Coding (see encryption) takes place using a key that ideally is known only by the sender and intended recipient of the message.

Note: Historically used in warfare, cryptography is now used routinely in computer networks. This often pits the desire of individuals and businesses to keep Internet information private against the need of government to investigate crime and terrorism.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

cryptography definition

The practise and study of encryption and decryption - encoding data so that it can only be decoded by specific individuals. A system for encrypting and decrypting data is a cryptosystem. These usually involve an algorithm for combining the original data ("plaintext") with one or more "keys" - numbers or strings of characters known only to the sender and/or recipient. The resulting output is known as "ciphertext".
The security of a cryptosystem usually depends on the secrecy of (some of) the keys rather than with the supposed secrecy of the algorithm. A strong cryptosystem has a large range of possible keys so that it is not possible to just try all possible keys (a "brute force" approach). A strong cryptosystem will produce ciphertext which appears random to all standard statistical tests. A strong cryptosystem will resist all known previous methods for breaking codes ("cryptanalysis").
See also cryptology, public-key encryption, RSA.
Usenet newsgroups: news:sci.crypt, news:sci.crypt.research.
Cryptography glossary (
RSA cryptography glossary (
Cryptography, PGP, and Your Privacy (
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It is an organization devoted to cryptography as a hobby.
Unfortunately, much of the information online about email encryption and
  cryptography is unnecessarily detailed and complex.
It's going to be a barnstorming adventure through symmetry groups, equation
  solving in a ring, and cryptography.
Again, you should not be writing books that involve cryptography.
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