Authentication & Encryption

certificate & Encryption
Introduction     assay-mark Procedures     Ciphering Procedures     

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Introduction
Authentication - Whenever a MS requests access to a interlocking, the network must authenticate the MS. Authentication verifies the identity and validity of the SIM bill to the network and ensures that the subscriber is authorized access to the network. 

Encryption - In GSM, encryption refers to the function of creating assay-mark and ciphering crypto-variables using a fussy key and an encryption algorithmic rule.

Ciphering - Ciphering refers to the process of changing plaintext data into encrypted data using a special key and a special encryption algorithm. Transmissions between the MS and the BTS on the Um link are enciphered.

Ki - The Ki is the idiosyncratic subscriber authentication key. It is a 128-bit number that is paired with an IMSI when the SIM card is created. The Ki is only stored on the SIM card and at the Authentication Center (AuC). The Ki will never be ancestral across the network on any link.

RAND - The RAND is a random 128-bit number that is generated by the AuC when the network requests to authenticate a subscriber. The RAND is utilize to generate the Signed receipt (SRES) and Kc crypto-variables.





Signed Response - The SRES is a 32-bit crypto-variable used in the authentication process. The MS is challenged by being given the RAND by the network, the SRES is the expected correct response. The MS receives the RAND as a challenge and uses it to calculate the SRES. The SRES is passed up to the network to as a response to the challenge.
A3 Algorithm - The A3 algorithm computes a 32-bit Signed Response (SRES). The Ki and RAND are inputted into the A3 algorithm and the essence is the 32-bit SRES. The A3 algorithm resides on the SIM card and at the AuC.

A8 Algorithm - The A8 algorithm computes a 64-bit ciphering key (Kc). The Ki and the RAND are inputted into the A8 algorithm and the dissolving agent is the 64-bit Kc. The A8...If you want to get a full essay, order it on our website: Orderessay



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