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On Long-Term Validation of E-Documents

In last few years we have observed tremendous growth in digital communications and e-commerce. In order to use public networks for business purposes (e.g. buying goods and signing contracts) we need mechanisms capable of vouching for validity of digitally signed documents long after their creation. Conventional validation techniques (e.g. digital signatures, certificate revocation lists) have been developed mainly for ephemeral use and must be supported by new techniques such as digital time-stamping and notary services. We outline the basic advantages these services provide in the context of longterm validation. We briefly summarize the aims and the current state of the CUCULUS time-stamping project and of new research and developement projects on notary services.