SYMMETRIC ENCRYTION Symmetric encryption is the oldest and best technique that contains a secret key (a number, a word, or just a string)of random letters. This key is applied to the text of a message to change the content. Secret key is used to encrypt and decrypt the message by the sender and receiver. · Same digital key is used by sender and receiver to encrypt and decrypt message · Different set of keys are required for each transaction · Length of binary key is used to encrypt data · Advanced Encryption Standard (AES) – Most widely used symmetric key encryption. It uses 128,192, and 256-bit encryption keys · Other standards use keys with up to 2,048 bits · It provides confidentiality of the message . · These algorithms tend to be comparatively fast, but they can be used only when involved parties have already exchanged keys. · DES, 3DES and AES are examples of symmetric algorithms. · The 56-
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