Symmetric Key Management Systems address the need to improve the way that enterprises manage symmetric keys over their lifecycle.

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While not as popular as public key methods, there are strong mechanisms for establishing authenticity through symmetric cryptography. If Alice and Bob know they have a reliable and unique shared secret (symmetric) key, then the ability for either of them to sensibly decrypt a message with that key provides strong evidence that the encrypted message came from the other party. Defence methods like the Fortezza card uses symmetric authentication in this way.

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