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Chapter 13. Cryptography > Secret-Key (Symmetric) Cryptography

Secret-Key (Symmetric) Cryptography

In a symmetric cryptosystem, shown in Figure 13-1, the message, sometimes called the plaintext, is encrypted using a key. The resulting ciphertext is sent to the recipient, who decrypts the message using the same key. Note that the same key must be known to both parties. Perhaps the best-known secret-key system is the Data Encryption Standard (DES), now supplanted by Triple DES and by the Advanced Encryption Standard (AES). Table 13-2 shows how symmetric cryptography achieves privacy, authentication, integrity, and nonrepudiation.

Figure 13-1. Symmetric Cryptosystem



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