Method for protecting a portable card

Information security – Protection of hardware

Reexamination Certificate

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C380S265000, C380S046000

Reexamination Certificate

active

10019344

ABSTRACT:
A method for protecting a portable card, provided with at least a crypto algorithm for enciphering data and/or authenticating the card, against deriving the secret key through statistical analysis of its information leaking away to the outside world in the event of cryptographic operations, such as power-consumption data, electromagnetic radiation and the like. The card is provided with at least a shift register having a linear and a non-linear feedback function for creating cryptographic algorithms. An algorithm is applied to the card, which is constructed in such a manner that the collection of values of recorded leak-information signals is resistant to deriving the secret key from statistical analysis of those values. Advantageously, after the key has been loaded into the shift register, the shift register clocks on, using at least the linear-feedback function. A suitable alternative is loading only the key into the shift register in the event of a fixed content of the shift register.

REFERENCES:
patent: 5054067 (1991-10-01), Moroney et al.
patent: 5365585 (1994-11-01), Puhl et al.
patent: 6278780 (2001-08-01), Shimada
patent: 6327661 (2001-12-01), Kocher et al.
patent: 6510228 (2003-01-01), Rose
patent: 196 22 533 (1997-12-01), None
patent: WO 98/52319 (1998-11-01), None
(International Search Report supplied).
Paul C. Kocher, “Timing Attacks on Implementations of Diffie-Hellman, RSA, DSS, and Other Systems”, Proceedings of the Annual International Cryptology Conference (Crypto), vol. CONF. 16, 1996, pp. 104-113.

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