A session key is a single-use symmetric key used for encrypting all messages in one communication session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or multicast key which refers to any key used for encrypting messages, contrary to other uses like encrypting other keys (key encryption key (KEK) or key wrapping key).
The session key is derived independently at both ends. It is never transmitted. How long is this session key valid? As long as a piece of string. It is valid until a re-handshake is performed, which can be initiated by either peer at any time. How does the server keep track of which session key is valid for which client? In the SSL Session.
Private Key Ssl
Apr 07, 2015 These keys are created together as a pair and work together during the SSL/TLS handshake process (using asymmetric encryption) to set up a secure session. The private key is a text file used initially to generate a Certificate Signing Request (CSR), and later to secure and verify connections using the certificate created per that request. In SSL protocol handshake both sides generate the same encryption key which is then used for the session. It is done following this procedure, in general: Client & server generate each a random value and send to each other Server sends the public key to the client.
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Session keys can introduce complications into a system, yet they solve some real problems. There are two primary reasons to use session keys:
- Several cryptanalytic attacks become easier the more material encrypted with a specific key is available. By limiting the amount of data processed using a particular key, those attacks are rendered harder to perform.
- asymmetric encryption is too slow for many purposes, and all secret key algorithms require that the key is securely distributed. By using an asymmetric algorithm to encrypt the secret key for another, faster, symmetric algorithm, it's possible to improve overall performance considerably. This is the process used by PGP and GPG.[1]
Like all cryptographic keys, session keys must be chosen so that they cannot be predicted by an attacker, usually requiring them to be chosen randomly. Failure to choose session keys (or any key) properly is a major (and too common in actual practice) design flaw in any crypto system.[citation needed]
See also[edit]
References[edit]
- ^OpenPGP Message Format http://tools.ietf.org/html/rfc4880