A Probing Attack on AES

  • Authors:
  • Jörn-Marc Schmidt;Chong Hee Kim

  • Affiliations:
  • Institute for Applied Information Processing and Communications (IAIK), Graz University of Technology, Graz, Austria 8010 and Secure Business Austria (SBA), Vienna, Austria 1040;UCL Crypto Group, Université Catholique de Louvain, Belgium, Louvain-la-Neuve, Belgium 1348

  • Venue:
  • Information Security Applications
  • Year:
  • 2009

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Abstract

The Advanced Encryption Standard (AES) defines the most popular block cipher. It is commonly used and often implemented on smart cards. In this paper, we show how a 128-bit AES key can be retrieved by microprobing. Thereby, a probe is placed onto the chip to spy on inner values. Watching one arbitrary bit of the AES State during the first two rounds of about 210 encryptions is enough to reveal the whole key. For special positions of the probe, this number can be reduced to 168. The paper demonstrates that even few information is sufficient for a successful attack on AES.