Susanne Engels

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Modern cryptography today is substantially involved with securing lightweight (and pervasive) devices. For this purpose, several lightweight cryptographic algorithms have already been proposed. Up to now, the literature has focused on hardware-efficiency while lightweight with respect to software has barely been addressed. However, a large percentage of(More)
We present DROWN, a novel cross-protocol attack on TLS that uses a server supporting SSLv2 as an oracle to decrypt modern TLS connections. We introduce two versions of the attack. The more general form exploits multiple unnoticed protocol flaws in SSLv2 to develop a new and stronger variant of the Bleichenbacher RSA padding-oracle attack. To decrypt a(More)
Elliptic curves have become widespread in cryptographic applications since they offer the same cryptographic functionality as public-key cryptosystems designed over integer rings while needing a much shorter bitlength. The resulting speedup in computation as well as the smaller storage needed for the keys, are reasons to favor elliptic curves. Nowadays,(More)
This paper accelerates FPGA computations of discrete logarithms on elliptic curves over binary fields. As an illustration, this paper reports successful completion of an attack against the SECG standard curve sect113r2, a binary elliptic curve that was not removed from the standard until 2010 and was not disabled in OpenSSL until June 2015. This is a new(More)
This paper accelerates FPGA computations of discrete logarithms on elliptic curves over binary fields. As a toy example, this paper successfully attacks the SECG standard curve sect113r2, a binary elliptic curve that was not removed from the SECG standard until 2010 and was not disabled in OpenSSL until June 2015. This is a new size record for completed(More)
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