Modeling security of long-term integrity solutions

14.07.2016, 16:30 – 18:00

2016/07/14 16:30-18:00

Speaker: Matthias Geihs | Location: Mornewegstraße 32 (S4|14), Room 3.1.01, Darmstadt


The talk will start with a brief overview of the goals and challenges of CROSSING Project S6 “Long-term secure digital archiving”. Afterwards, the talk focuses on modeling security for long-term integrity solutions.

Digital signature schemes are commonly used to ensure integrity of digital information. Unfortunately, the security of such schemes can in general only be guaranteed over a few years. Therefore, various specifications have been made that promise to protect the integrity of digital information over a much longer period of time (i.e, decades or even centuries). To understand which level of security existing specifications for long-term integrity protection offer, it is important to formally analyze their security.

In this talk, we present a novel security model for analyzing the security of long-term integrity schemes. The model allows to estimate for which time period a given scheme provides sufficient protection, depending on properties of the environment in which the scheme is used in. Various existing specifications for long-term integrity protection use timestamps. We present an example construction of a timestamp-based long-term integrity scheme which captures the core functionality of many existing specifications. We analyze the security of that scheme using our model.

Short Bio

Website of Mathias Geihs at TU Darmstadt.