preshared keys

(redirected from Preshared secret)

preshared keys

The use of secret passwords or encryption keys that are entered into both sides of the message exchange ahead of time. Preshared keys (PSK) are typed into the clients and servers (authentication servers, access points, etc.) or entered via floppy, CD-ROM or smart card. Contrast with "server-based keys," in which one side generates a key and sends it to the other side during the authentication session.
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GSM uses a 128-bit preshared secret key for securing the interface between the mobile device and the base station.
UMTS also uses a 128-bit preshared secret key between the USIM card of the mobile device and the AuC.