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KBS. Knowledge-Based System.
Key. A value used as part of a process of encryption or decryption to transform confidential information. Decryption is easy if you have the key, otherwise it is very difficult. Security depends on keeping the key secret.
Key escrow. Storage of a private key by a neutral third party. Key length. The number of bits comprising a key. Key management. The secure generation, allocation, distribution and replacement of keys for a cryptosystem.
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Cards and payments