An Improved Guess-and-Determine Attack on the A5/1 Stream Cipher


  •  Ayan Mahalanobis    
  •  Jay Shah    

Abstract

In Europe and North America, the most widely used stream cipher to ensure privacy and confidentiality of conversations in GSM mobile phones is the A5/1. In this paper, we present an improved guess-and-determine attack on the A5/1 stream cipher with an average time complexity of 2^48.5, which is much less than any known guess-and-determine attack. The attack has a 100% success rate and requires a small amount of memory. We provide a detailed description of our new attack along with its implementation results.


This work is licensed under a Creative Commons Attribution 4.0 License.
  • ISSN(Print): 1913-8989
  • ISSN(Online): 1913-8997
  • Started: 2008
  • Frequency: semiannual

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