Original scientific paper

https://doi.org/10.24138/jcomss-2021-0104

State Transition Analysis of GSM Encryption Algorithm A5/1

Praveen Kumar Gundaram orcid.org/0000-0002-4229-4209 ; Acharya Nagarjuna University, Guntur, Andhra Pradesh - 522510, India
Appala Naidu Tentu ; CR RAO AIMSCS, UoH Campus, Hyderabad, Telangana - 500046, India
Swamy Naidu Allu ; CR RAO AIMSCS, UoH Campus, Hyderabad, Telangana - 500046, India

Abstract

A5/1 stream cipher is used in Global System for Mobile Communication(GSM) phones for secure communication. A5/1 encrypts the message transferred from a mobile user. In this paper, we present the implementation of cryptanalytic on A5/1 techniques such as minimized state recovery for recovering the session key. The number of state transitions/updations needed for a state S to reoccur is maintained in the lookup table. This table can be used to recover the initial state from which the keystream was produced. Experiments are carried out for reduced version, full A5/1 cipher on 3.20 GHz machine, and cluster computing facility.

Keywords

A5/1 stream cipher; Cryptanalysis; Precomputed Tables; Keystream; Initial State Transition; Periodicity

Hrčak ID:

272234

URI

https://hrcak.srce.hr/272234

Publication date:

31.3.2022.

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