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Table Of Contents  CertiGuide to Security+
 9  Chapter 4:  Basics of Cryptography (Domain 4.0; 15%)
      9  4.1  Algorithms

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4.1.2  Symmetric

Symmetric cryptography algorithms use a “shared secret” key known to the sender and authorized recipient of an encrypted message. The same key is used whether you are encrypting or decrypting the document (thus the name, symmetric). The key must be protected so that unauthorized personnel can’t use it to decrypt the document.

Symmetric

Symmetric encryption uses a “shared secret” key and (usually) a non-secret algorithm to perform the encryption and decryption.

The same key is used to encrypt and decrypt the message.

Because anyone possessing the key can decrypt the message, it is important to protect the key from access by unauthorized personnel.


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Types of Symmetric Algorithms
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