Php Generate Unique Session Key
Apr 13, 2016 Generating Sessions Ids. Umer Mansoor Follow Apr 13. Session Ids are unique, transient and non-guessable. The server then uses the username, the IP address and secret key to re-generate the session Id and see if it matches with the session Id passed by the client. If it does, the verification is successful. Sessioncreateid is used to create new session id for the current session. It returns collision free session id. If session is not active, collision check is omitted. Session ID is created according to php.ini settings. It is important to use the same user ID of your web server for GC task script. The Global Session Helper You may also use the global session PHP function to retrieve and store data in the session. When the session helper is called with a single, string argument, it will return the value of that session key. When the helper is called with an array of key / value pairs, those values will be stored in the session.
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).
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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]
Php Generate Session Key
References[edit]
Php Generate Unique Session Key In Word
- ^OpenPGP Message Format http://tools.ietf.org/html/rfc4880