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EAX mode (encrypt-then-authenticate-then-translate [1]) is a mode of operation for cryptographic block ciphers. It is an Authenticated Encryption with Associated Data algorithm designed to simultaneously provide both authentication and privacy of the message (authenticated encryption) with a two-pass scheme, one pass for achieving privacy and one for authenticity for each block.
Authenticated Encryption (AE) is an encryption scheme which simultaneously assures the data confidentiality (also known as privacy: the encrypted message is impossible to understand without the knowledge of a secret key [1]) and authenticity (in other words, it is unforgeable: [2] the encrypted message includes an authentication tag that the sender can calculate only while possessing the ...
Known as the Diffie-Hellman key exchange, the encryption key can be openly communicated as it poses no risk to the confidentiality of encrypted messages. One party exchanges the keys to another party where they can then encrypt messages using the key and send back the cipher text.
The first successful password-authenticated key agreement methods were Encrypted Key Exchange methods described by Steven M. Bellovin and Michael Merritt in 1992. Although several of the first methods were flawed, the surviving and enhanced forms of EKE effectively amplify a shared password into a shared key, which can then be used for ...
A key derivation function is used to derive the different keys used in a crypto context (SRTP and SRTCP encryption keys and salts, SRTP and SRTCP authentication keys) from one single master key in a cryptographically secure way. Thus, the key management protocol needs to exchange only one master key, all the necessary session keys are generated ...
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The encryption function uses an encryption key e to change a plaintext message m into an encrypted message, or ciphertext, (,) . Corresponding to each encryption key e there is a decryption key d which allows the message to be recovered using the decryption function, D ( d , E ( e , m ) ) = m {\displaystyle D(d,E(e,m))=m} .