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  4. Practical Cryptography in High Dimensional Tori
 
conference paper

Practical Cryptography in High Dimensional Tori

van Dijk, Marten
•
Granger, Robert  
•
Page, Dan
Show more
Cramer, Ronald
2005
Advances in Cryptology – EUROCRYPT 2005, 24th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Aarhus, Denmark, May 22-26, 2005. Proceedings
Advances in Cryptology – EUROCRYPT 2005

At Crypto 2004, van Dijk and Woodruff introduced a new way of using the algebraic tori $T_n$ in cryptography, and obtained an asymptotically optimal $n/\phi(n)$ savings in bandwidth and storage for a number of cryptographic applications. However, the computational requirements of compression and decompression in their scheme were impractical, and it was left open to reduce them to a practical level. We give a new method that compresses orders of magnitude faster than the original, while also speeding up the decompression and improving on the compression factor (by a constant term). Further, we give the first efficient implementation that uses $T_{30}$, compare its performance to XTR, CEILIDH, and ECC, and present new applications. Our methods achieve better compression than XTR and CEILIDH for the compression of as few as two group elements. This allows us to apply our results to ElGamal encryption with a small message domain to obtain ciphertexts that are 10% smaller than in previous schemes.

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Type
conference paper
DOI
10.1007/11426639_14
Author(s)
van Dijk, Marten
Granger, Robert  
Page, Dan
Rubin, Karl
Silverberg, Alice
Stam, Martijn
Woodruff, David
Editors
Cramer, Ronald
Date Issued

2005

Publisher

Springer Berlin Heidelberg

Published in
Advances in Cryptology – EUROCRYPT 2005, 24th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Aarhus, Denmark, May 22-26, 2005. Proceedings
Series title/Series vol.

Lecture Notes in Computer Science; 3494

Start page

234

End page

250

Subjects

Torus-based cryptography

•

Discrete-log based cryptography

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
IIF  
Event nameEvent placeEvent date
Advances in Cryptology – EUROCRYPT 2005

Aarhus, Denmark

May 22-26, 2005

Available on Infoscience
January 19, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/122388
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