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Square Always Exponentiation

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Progress in Cryptology – INDOCRYPT 2011 (INDOCRYPT 2011)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 7107))

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Abstract

Embedded exponentiation techniques have become a key concern for security and efficiency in hardware devices using public key cryptography. An exponentiation is basically a sequence of multiplications and squarings, but this sequence may reveal exponent bits to an attacker on an unprotected implementation. Although this subject has been covered for years, we present in this paper new exponentiation algorithms based on trading multiplications for squarings. Our method circumvents attacks aimed at distinguishing squarings from multiplications at a lower cost than previous techniques. Last but not least, we present new algorithms using two parallel squaring blocks which provide the fastest exponentiation to our knowledge.

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Clavier, C., Feix, B., Gagnerot, G., Roussellet, M., Verneuil, V. (2011). Square Always Exponentiation. In: Bernstein, D.J., Chatterjee, S. (eds) Progress in Cryptology – INDOCRYPT 2011. INDOCRYPT 2011. Lecture Notes in Computer Science, vol 7107. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25578-6_5

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  • DOI: https://doi.org/10.1007/978-3-642-25578-6_5

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-25577-9

  • Online ISBN: 978-3-642-25578-6

  • eBook Packages: Computer ScienceComputer Science (R0)

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