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encryption
In cryptography, encryption is the process of encoding messages or information in such a way that only authorized parties can read it.〔"What is Encryption? | EFF Surveillance Self-Defense Project." What is Encryption? | EFF Surveillance Self-Defense Project. Surveillance Self-Defense Project, n.d. Web. 03 Nov. 2014. .〕 Encryption does not of itself prevent interception, but denies the message content to the interceptor.〔Goldreich, Oded. Foundations of Cryptography: Volume 2, Basic Applications. Vol. 2. Cambridge university press, 2004.〕 In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted.〔 For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. It is in principle possible to decrypt the message without possessing the key, but, for a well-designed encryption scheme, large computational resources and skill are required. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.
==Types of encryption==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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