| Presentation | 2003/3/20 A Forward-Secure Digital Signature Scheme Using Previous Signatures for Renewing the Signing-Key Tomofumi TAKAHASHI, Junji SHIKATA, Tsutomu MATSUMOTO, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Several digital signature schemes such as Forward-Secure Digital Signatures and Key-Insulated Sgnature Schemes have been proposed in order to realize the resistance to the physical attacks. The Forward-Secure Digital Signature provides a solusion for the problem of the damage of signing-key exposure by evolving the signing-key for each divided period. If the key-evolution is one-way, it is shown that the adversary cannot forge any signature which was generated in previous periods even if he could steal a signing-key in the current period by physical attacks. Also. The Key-Insulated Signature Scheme is a signature scheme with the aim of solving the problem of damage of key exposure. In this scheme, a signing-key is updating by the use of a secure external devic, such as smart cards, storing "master-kye" Therefore, under the assumption that the master-key is kept secure, it is shown that even the adversary who can successfully steal a current signing-key cannot forge any signature which is generated in other periods. In this paper, we propose a new digital signature scheme based on Forward-Secure Digital Signatures. Our scheme meets the same security requirement which the Key-Insulated Signature Scheme achieves without a secure external device, since our scheme uses the record of previously issued signatures instead of the master-key in order to renew the signing-key. Another advantage of our sheme includes the use of the record of previously issued signatures for the evidence to prove an illegal signature. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Physical attacks / Signing-key renewing / Previous signatures |
| Paper # | IT2002-92,ISEC2002-150,SST2002-198,ITS2002-175 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2003/3/20(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Information Security (ISEC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Forward-Secure Digital Signature Scheme Using Previous Signatures for Renewing the Signing-Key |
| Sub Title (in English) | |
| Keyword(1) | Physical attacks |
| Keyword(2) | Signing-key renewing |
| Keyword(3) | Previous signatures |
| 1st Author's Name | Tomofumi TAKAHASHI |
| 1st Author's Affiliation | Graduate School of Environment and Information Sciences Yokohama National University() |
| 2nd Author's Name | Junji SHIKATA |
| 2nd Author's Affiliation | Graduate School of Environment and Information Sciences Yokohama National University |
| 3rd Author's Name | Tsutomu MATSUMOTO |
| 3rd Author's Affiliation | Graduate School of Environment and Information Sciences Yokohama National University |
| Date | 2003/3/20 |
| Paper # | IT2002-92,ISEC2002-150,SST2002-198,ITS2002-175 |
| Volume (vol) | vol.102 |
| Number (no) | 744 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |