Abstract
Efficient secure time-stamping schemes employ a 2-level approach in which the time-stamping service operates in rounds. We say that a time-stamping service is accountable if if it makes the TSA and other authorities accountable for their actions by enabling a principal to detect and later prove to a judge any frauds, including attempts to reorder time-stamps from the same round. We investigate the paradigm of time-stamping services based on simply connected graphs, and propose a simple, yet optimal, accountable time-stamping service, using what we call threaded tree schemes. We improve upon the previously best scheme by Buldas and Laud by reducing the size of a time stamp by a factor of about 3.786 and show that our construction is optimal in a strict sense. The new protocols also increase the trustworthiness of the publication process, which takes place at the end of each round.
| Original language | English |
|---|---|
| Title of host publication | Public Key Cryptography (Proceedings PKC 2000, Melbourne, Australia, January 18-20, 2000) |
| Editors | H. Imai, Y. Zheng |
| Place of Publication | Berlin |
| Publisher | Springer |
| Pages | 293-305 |
| ISBN (Print) | 3-540-66967-1 |
| DOIs | |
| Publication status | Published - 2000 |
Publication series
| Name | Lecture Notes in Computer Science |
|---|---|
| Volume | 1751 |
| ISSN (Print) | 0302-9743 |
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Cite this
Buldas, A., Lipmaa, H., & Schoenmakers, L. A. M. (2000). Optimally efficient accountable time-stamping. In H. Imai, & Y. Zheng (Eds.), Public Key Cryptography (Proceedings PKC 2000, Melbourne, Australia, January 18-20, 2000) (pp. 293-305). (Lecture Notes in Computer Science; Vol. 1751). Springer. https://doi.org/10.1007/978-3-540-46588-1_20