Henri Massias

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This paper discusses some of the issues that appear on the creation and use of secure digital timestamps. From the timestamp creation side, it first introduces a review on the existing systems, giving a recommendation for the one we believe is more suitable for the general use. Afterwards, it deals with an extension of the basic scheme in order to be used(More)
2 Overview The interaction between time and cryptography is a new subject. Nevertheless , the time in cryptography is of high importance especially for electronic contracts. First we must deene what we call time in cryptography and the diierent situations we will deal with. Two of the needs are to timestamp a document to answer the question \When has this(More)
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