Hanno Langweg

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Digital signatures are a key technology for many Internet-based commercial and administrative applications and, therefore, an increasingly popular target of attacks. Due to their strong cryptographic properties an attacker is more likely to subvert them with malicious software, ie Trojan horse programs. We show that by fusing two techniques, our(More)
Software for the creation of digital signatures performs a delicate task. The signatory has to trust the manufacturer of the software that it will work in the intended way. Signing a document electronically will have legal consequences in a growing number of countries, therefore the security of the signing software is an important issue. In the past, Trojan(More)
Electronic signatures are introduced by more and more countries as legally binding means for signing electronic documents with the primary hope of boosting e-commerce and e-government. Given that the underlying cryptographic methods are sufficiently strong, attacks by Trojan horse programs on electronic signatures are becoming increasingly popular. Most of(More)