C. Marinescu and N. Ţǎpuş (Romania)
communication protocols, digital signatures, PKI, security, time-stamping, TSA.
One of the most important problems users of digital signa tures are facing is establishing the exact moment the signa ture was created. Because many non-repudiation and au thentication services require this capacity, it is very impor tant to deliver trustworthy and secure time-stamping ser vices. But what is the real importance of time-stamping? Is it possible to deliver secure time-stamp services based on the protocols known today? If not, what other proto cols are needed to achieve this task? This paper presents some of the problems that time-stamping techniques are confronted with and tries to put the advantages and disad vantages of the different available time-stamping schemes in perspective. The paper also aims to propose one possi bility to overcome the current dead-end in achieving highly secure time-stamping schemes.
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