Abstract
We present W-OTS+, a Winternitz type one-time signature scheme (W-OTS). We prove that W-OTS+ is strongly unforgeable under chosen message attacks in the standard model. Our proof is exact and tight. The first property allows us to compute the security of the scheme for given parameters. The second property allows for shorter signatures than previous proposals without lowering the security. This improvement in signature size directly carries over to all recent hash-based signature schemes. I.e. we can reduce the signature size by more than 50% for XMSS+ at a security level of 80 bits. As the main drawback of hash-based signature schemes is assumed to be the signature size, this is a further step in making hash-based signatures practical.
Original language | English |
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Title of host publication | Progress in Cryptology–AFRICACRYPT 2013 |
Subtitle of host publication | 6th International Conference on Cryptology in Africa, Cairo, Egypt, June 22-24, 2013. Proceedings |
Editors | A. Youssef, A. Nitaj, A.E. Hassanien |
Place of Publication | Berlin |
Publisher | Springer |
Chapter | 10 |
Pages | 173-188 |
Number of pages | 16 |
ISBN (Electronic) | 978-3-642-38553-7 |
ISBN (Print) | 978-3-642-38552-0 |
DOIs | |
Publication status | Published - 2013 |
Externally published | Yes |
Event | 6th International Conference on the Theory and Application of Cryptographic Techniques in Africa (Africacrypt 2013) - Cairo, Egypt Duration: 22 Jun 2013 → 24 Jun 2013 Conference number: 6 |
Publication series
Name | Lecture Notes in Computer Science (LNCS) |
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Volume | 7918 |
ISSN (Print) | 0302-9743 |
ISSN (Electronic) | 1611-3349 |
Conference
Conference | 6th International Conference on the Theory and Application of Cryptographic Techniques in Africa (Africacrypt 2013) |
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Abbreviated title | Africacrypt 2011 |
Country/Territory | Egypt |
City | Cairo |
Period | 22/06/13 → 24/06/13 |
Keywords
- digital signatures
- hash functions
- hash-based signatures
- one-time signature schemes
- provable security