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• W1502914266 abstract "For many cryptographic protocols, security relies on the assumption that adversarial entities have lim- ited computational power. This type of security degrades progressively over the lifetime of a protocol. However, some cryptographic services, such as timestamping services or digital archives, are long-lived in nature; they are expected to be secure and operational for a very long time (i.e., super-polynomial). In such cases, security cannot be guaranteed in the traditional sense: a computationally secure protocol may become insecure if the attacker has a super-polynomial number of interactions with the protocol. This paper proposes a new paradigm for the analysis of long-lived security protocols. We allow entities to be active for a potentially unbounded amount of real time, provided they perform only a polynomial amount of work per unit of real time. Moreover, the space used by these entities is allocated dynamically and must be polynomially bounded. We propose a new notion of long-term implementation, which is an adaptation of computational indistinguishability to the long-lived setting. We show that long-term implementation is preserved under polynomial parallel composi- tion and exponential sequential composition. We illustrate the use of this new paradigm by analyzing some security properties of the long-lived timestamping protocol of Haber and Kamat." @default.
• W1502914266 created "2016-06-24" @default.
• W1502914266 creator A5035682803 @default.
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• W1502914266 date "2008-11-22" @default.
• W1502914266 modified "2023-09-23" @default.
• W1502914266 title "Modeling Computational Security in Long-Lived Systems, Version 2" @default.
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• W1502914266 hasPublicationYear "2008" @default.
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