Cryptography, derived from Greek words: krptos- secret and graphy- writing. Cryptography or secret writing is method of transforming the appearance of the information without changing the information content. It refers both to the process or skill of communication in secret writing and to the use of codes to convert the information so that only the recipient will be able to read it.
The basic keywords used in cryptography are plaintext and ciphertext, and Cryptanalysis and Cryptology. Plaintext refers to the information that is written in natural language, easily read by everyone. Ciphertext is different representation of information, designed to protect the information from an unauthorized access. Encryption is conversion of plaintext into ciphertext and decryption, the reverse process of encryption, is conversion of ciphertext into plaintext.
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