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gsm security and encryption.ppt
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please send me ppts on gsm security and encryption.
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you can refer these pages to get the details on GSM SECURITY AND ENCRYPTION
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.pptx  gsm security and encryption.pptx (Size: 409.76 KB / Downloads: 49)
What is GSM?

GSM stands for Global System for Mobile communication
The GSM emerged in the early 1970’s
The GSM is a circuit switched system that divides each 200KHZ channel into eight 25KHZ timeslots
The GSM owns a market share of more than 70 % of the digital cellulor subscribers.

Why GSM?

International roaming
Low-cost mobile sets and base stations
High quality speech
Compatability with integrated services digital network(ISDN) and other telephone company services
Support for new services.

GSM Brief history

1982 CEPT establishes a GSM group inorder to develop the standerds for a pan european cellulor mobile system
1987 Time Division Multiple Access (TDMA) is choosen as the access method
1988 GSM system is validated

GSM security model

The purpose of GSM security:
The access to the mobile services.
Any relavent item from being disclosed at the radio path,mainly inorder to ensure that.
Privacy of user- related information.

Security features of GSM

Authentication of registered subscribers only.
Secure data transfer through the use of encryption.
Subscriber identity protection.
Mobile phones are inoperable without a SIM.
Duplicate SIM or not allowed in the network.

The Authentication Procedure

The mobile station send IMSI to the network.
The network received IMSI and found corresponding KI of that IMSI.
The network generated a 128 bit random number(RAND) and sent it to the mobile station over the air interface.
The MS calculates a SRES with A3 algorithm using the given challenge(RAND) and KI residing in the SIM.At the same time networks calculates the SERS using the same algorithm and same inputs
The MS sends SERS to the network
The network test the SERS for the validity

Encryption of the data

Encrypted communication is initiated by a ciphering mode request command for the GSM network
A5 algorithm used for encrypt the data
The MS authentication is an optional procedure in the beginning of the call,but it is usually not performed

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