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What does encryption mean and how does it work?

Encryption is the process of converting a plaintext message into an alternate ciphertext message. The cipher text message contains all the information of the plaintext message, but is not in a format readable by a human or computer.

The inverse process, of extracting the original information, is called decryption and can only be accomplished using auxiliary information, called a key.

Most encryption methods can be divided into symmetric key algorithms and asymmetric key algorithms. In a symmetric key algorithm (e.g., DES and AES), the sender and receiver must have a shared key set up in advance and kept secret from all other parties; the sender uses this key for encryption, and the receiver uses the same key for decryption. In an asymmetric key algorithm (e.g., RSA), there are two separate keys: a public key is published and enables any sender to perform encryption, while a private key is kept secret by the receiver and enables him to perform decryption. Learn more about symmetric key algorithm





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