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Explanation/Reference: Symmetrickey cryptography uses the same key to encrypt and decrypt data. Therefore the sender and receiver must each have a copy of the key. It is important that no other entity gains access to the key otherwise they would be able to decrypt the data as well. Common key algorithms include the Data Encryption Standard (DES), Triple DES (3DES), and Advanced Encryption Standard (AES). Reference: Oracle Reference Architecture, Security , Release 3.1