Title:
A METHOD AND DEVICE FOR EXECUTING A DECRYPTING MECHANISM THROUGH CALCULATING A STANDARDIZED MODULAR EXPONENTIATION FOR THWARTING TIMING ATTACKS
Document Type and Number:
WIPO Patent Application WO1999014880
Kind Code:
A3
Abstract:
An encrypting exponentiation modulo M is effected by a modular multiplication X*YmodM, where M is a temporally steady but instance-wise non-uniform modulus. The method involves an iterative series of steps. Each step executes one or two first multiplications to produce a first result, and a trim-down reduction of the size of the first result by one or more second multiplications to produce a second result. The method furthermore takes a distinctive measure for keeping the final result of each step below a predetermined multiplicity of the modulus. In particular, the method postpones substantially any subtraction of the modulus as pertaining to the measure to a terminal phase of the modular exponentiation. This is possible through choosing in an appropriate manner one or more parameters figuring in the method. This further maintains overall temporal performance.
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Inventors:
HOLLMANN HENDRIK DIRK LODEWIJK
VAN DIJK MARTEN ERIK
LENOIR PETRUS JOHANNES
VAN DIJK MARTEN ERIK
LENOIR PETRUS JOHANNES
Application Number:
PCT/IB1998/001255
Publication Date:
June 10, 1999
Filing Date:
August 17, 1998
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS SVENSKA AB (SE)
PHILIPS SVENSKA AB (SE)
International Classes:
G06F7/72; G09C1/00; H04K1/02; H04L9/30; (IPC1-7): H04K1/02; H04L9/30
Foreign References:
| US5166978A | 1992-11-24 | |||
| US5479511A | 1995-12-26 | |||
| US5604805A | 1997-02-18 |
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