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Encryption is the process of transforming any plain-text into cipher text,
which cannot be read by an unauthorized user. Decryption is the process of
transforming the cipher text back to its original form. Both encryption and
decryption use a "key" to transform data.
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In general, there are two types of encryption: symmetric and asymmetric.
In symmetric encryption both the encoder and the decipherer use the same key.
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Read more in the article "Securing Electronic Commerce".
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