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I S P  G L O S S A R Y
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digital envelope
Last modified: Thursday, April 24, 1997 

A type of security that uses two layers of encryption to protect a message. First, the message itself is encoded using symmetric encryption, and then the key to decode the message is encrypted using public-key encryption. This technique overcomes one of the problems of public-key encryption, which is that it is slower than symmetric encryption. Because only the key is protected with public-key encryption, there is very little overhead.

 
Related Categories

Security

Related Terms

encryption

public-key encryption

symmetric encryption

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