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Implementation of AES Key Schedule Using Look-Ahead Technique

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Abstract

The commencement of decryption process of Advanced Encryption Standard (AES) algorithm is dependent on availability of the last round key. In this paper, we propose a look-ahead technique for increasing the speed of implementation of AES key schedule using which the last round key can be made available fast. The other round keys can also be computed in a parallel path using the proposed technique. Applications such as key search engines need to be agile to key changes for decrypting given encrypted messages using all the keys in the available key space so that fast decryption is possible. The FPGA implementation results using Xilinx XC5VLX85 are also provided.

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Authors and Affiliations

  1. Department of Computer Science and Engineering, Visvesvaraya Technological University, Belgaum, India

    Rashmi R. Rachh

  2. Electronics Corporation of India Lmited, Bangalore, 5600, India

    P. V. Ananda Mohan

  3. KLE Institute of Technology, Hubli, India

    B. S. Anami

Authors
  1. Rashmi R. Rachh
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  2. P. V. Ananda Mohan
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  3. B. S. Anami
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Correspondence to P. V. Ananda Mohan.

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Rachh, R.R., Mohan, P.V.A. & Anami, B.S. Implementation of AES Key Schedule Using Look-Ahead Technique. Circuits Syst Signal Process 33, 3663–3670 (2014). https://doi.org/10.1007/s00034-014-9825-2

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  • DOI: https://doi.org/10.1007/s00034-014-9825-2

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