Cryptography Definitions and Concepts

Why can’t I read this?

Response: It is in ciphertext.

Encryption is a method of transforming readable data, called plaintext, into a form that appears to be random and unreadable, which is called ciphertext. Plaintext is in a form that can be understood either by a person (a document) or by a computer (executable code). Once it is transformed into ciphertext, neither human nor machine can properly process it until it is decrypted. This enables the transmission of confidential information over insecure channels without unauthorized disclosure. When data are stored on a computer, they are usually protected by logical and physical access controls. When this same sensitive information is sent over a network, ...

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