LNCS 2729 Instant Ciphertext Only Cryptanalysis of GSM Encrypted Communication 1st Edition by Elad Barkan, Eli Biham, Nathan Keller  ISBN 3540451463 9783540451464

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Product details:

ISBN 10: 3540451463

ISBN 13: 9783540451464

Author:  Elad Barkan, Eli Biham, Nathan Keller  

LNCS 2729 – Instant Ciphertext-Only Cryptanalysis of GSM Encrypted Communication 1st Edition: In this paper we present a very practical ciphertext-only cryptanalysis of GSM encrypted communication, and various active attacks on the GSM protocols. These attacks can even break into GSM networks that use “unbreakable” ciphers. We describe a ciphertext-only attack on A5/2 that requires a few dozen milliseconds of encrypted off-the-air cellular conversation and finds the correct key in less than a second on a personal computer. We then extend this attack to a (more complex) ciphertext-only attack on A5/1. We describe new attacks on the protocols of networks that use A5/1, A5/3, or even GPRS. These attacks are based on security flaws of the GSM protocols, and work whenever the mobile phone supports A5/2. We emphasize that these attacks are on the protocols, and are thus applicable whenever the cellular phone supports a weak cipher, for instance they are also applicable using the cryptanalysis of A5/1. Unlike previous attacks on GSM that require unrealistic information, like long known plaintext periods, our attacks are very practical and do not require any knowledge of the content of the conversation. These attacks allow attackers to tap conversations and decrypt them either in real-time, or at any later time. We also show active attacks, such as call hijacking, altering of data messages and call theft.

 

LNCS 2729 – Instant Ciphertext-Only Cryptanalysis of GSM Encrypted Communication 1st Edition Table of contents:

1 Introduction

2 Description of A5/2 and GSM Security Background
2.1 GSM Security Background: A3/A8 and GPRS

3 A Known Plaintext Attack on A5/2
3.1 Optimization of the Known Plaintext Attack on A5/2

4 An Instant Ciphertext-Only Attack on A5/2

5 Leveraging the Attacks to Any GSM Network

6 Passive Ciphertext-Only Cryptanalysis of GSM-A5/1 Encrypted Communication

7 Possible Attack Scenarios
7.1 Call Wire-Tapping
7.2 Call Hijacking
7.3 Altering of Data Messages (SMS)
7.4 Call Theft — Dynamic Cloning

8 Summary

 

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