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On reusing ephemeral keys in Diffie-Hellman key agreement protocols
by Alfred Menezes, Berkant Ustaoglu
International Journal of Applied Cryptography (IJACT), Vol. 2, No. 2, 2010

 

Abstract: A party may choose to reuse ephemeral public keys in a Diffie-Hellman key agreement protocol in order to reduce its computational workload or to mitigate against denial-of-service attacks. In this note, we show that small-subgroup attacks can be successfully launched on some Diffie-Hellman protocols that reuse ephemeral keys if domain parameters are not appropriately selected or if public keys are not appropriately validated.

Online publication date: Fri, 28-Jan-2011

 

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