Method of producing a response

Details Method of producing a response Method of producing a response

2006-09-12

2006-09-12

Moise, Emmanuel L. (Department: 2137)

Information security

Access control or authentication

Stand-alone

C726S009000, C713S159000, C713S172000, C713S179000, C705S065000, C705S067000, C705S071000, C705S072000, C380S281000, C380S282000, C902S026000

Reexamination Certificate

active

07107616

ABSTRACT:
The present invention relates to a device (1) comprising an input for receiving an input; calculation means (P) for producing a response (OUTPUT) in response to the input (INPUT) and a secret key (A) by utilizing a first predetermined function (f), and an output (3) for feeding said response (OUTPUT) further. In order for an attacker not be able to find out the secret key, the device further comprises a memory (M) in which the key-specific number (RND) is stored, and means for retrieving the key-specific number (RND) from the memory (M) and for feeding it to the calculation means (P′) for carrying out predetermined calculation operations (f2) on the basis of the key-specific number (RND) when producing said response (OUTPUT).

REFERENCES:
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patent: 4799258 (1989-01-01), Davies
patent: 5546463 (1996-08-01), Caputo
patent: 5604801 (1997-02-01), Dolan et al.
patent: WO 99/35782 (1999-07-01), None
Messerges et al., “Investigations of Power Analysis Attacks on Smartcards”,USENIX Workshop on Smartcard Technology, pp. 151-161, (1999).
Kocher et al., “Differential Power Analysis”,Advances in Cryptology, pp. 388-397, (1999).

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