Generalized linear threshold scheme
Proceedings of CRYPTO 84 on Advances in cryptology
Fair exchange with a semi-trusted third party (extended abstract)
Proceedings of the 4th ACM conference on Computer and communications security
Communications of the ACM
Security Architecture of the Austrian Citizen Card Concept
ACSAC '02 Proceedings of the 18th Annual Computer Security Applications Conference
Providing Certified Mail Services on the Internet
IEEE Security and Privacy
Multiparty nonrepudiation: A survey
ACM Computing Surveys (CSUR)
An intensive survey of fair non-repudiation protocols
Computer Communications
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It is vital for public administrations and private businesses to send important documents such as bids or subpoenas in a secure and reliable way. Therefore, many countries have put various certified mail systems in place on the Internet. Due to the low number of official deliveries, it is reasonable to search for synergies with the private sector to guarantee the economic success of such widely-deployed systems. Opening a governmental system to the private sector inevitably raises challenges and security requirements in terms of qualified identification, data privacy protection, and trust. Privacy issues may arise when national (governmental) identification numbers are used. Trust issues may arise when trusted third parties are involved. Even if trusted third parties do not conspire with senders or recipients concerning a fair message exchange, they may cheat when financial interests come into play, e.g. in a permessage payment scheme. In this paper we present a solution addressing these issues from a practical viewpoint. Our solution distributes trust among different domains and introduces a scheme for qualified authentication and identification of recipients using the Austrian national electronic ID card to meet the requirements for data privacy protection.