full-disclosure - [FD] [IAIK JCE] Timing Attack Side Channel in DSA Implementation

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Message-ID: <CA+ObNtaSN9vOc=dDiGBzcKGxJG1qj6Lz-W1sqTzO-4xW=GrSdQ@mail.gmail.com>
Date: Fri, 22 May 2020 15:22:38 +0200
From: Giuseppe Cocomazzi <sbudella@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] [IAIK JCE] Timing Attack Side Channel in DSA Implementation

IAIK JCE is a provider for the Java Cryptography Extension that,
according to the vendor, "supplements the security functionality of
the default JDK". It is a commercial product developed by Stiftung
Secure Information and Communication Technologies:
https://jce.iaik.tugraz.at/about-us/

The way that some of the computations involved in the signature
generation are carried out introduces a side channel that leaks timing
information about the ephemeral number k.

Full details about the vulnerability are available here:
http://sbudella.altervista.org/blog/20200521-iaik-timing.html

Giuseppe Cocomazzi
http://sbudella.altervista.org

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