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- See also changes related to Plaintext, or pages that link to Plaintext or to this page or whose text .
- Cryptography : A field at the intersection of mathematics and computer science that is concerned with the security of information, typically the confidentiality, integrity and authenticity of some message.
- Cryptology : The theory and practice of protecting the content of communications, and of defeating the protective measures
- Information theory : Theory of the probability of transmission of messages with specified accuracy when the bits of information constituting the messages are subject, with certain probabilities, to transmission failure, distortion, and accidental additions.
- Ciphertext : The result of applying a encryption algorithm and an encryption key to plaintext]
- Cipher : A means of combining plaintext (of letters or numbers, or bits), using an algorithm that mathematically manipulates the individual elements of plaintext, into ciphertext, a form unintelligible to any recipient that does not know both the algorithm and a randomizing factor called a cryptographic key
- Code (cryptography) : A means of substituting, for the linguistically meaningful symbols of plaintext composed of words or other symbols meaningful to humans, into inherently meaningless numbers, letters, or words that make no sense to a recipient who is not in possession of a codebook or other means of reversing the substitution of symbols
- Cryptographic key : Value used by a computer together with a complex algorithm to encrypt and decrypt messages.