Electrical computers and digital processing systems: support – Computer program modification detection by cryptography
Reexamination Certificate
2007-06-12
2007-06-12
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Computer program modification detection by cryptography
C226S026000, C726S034000
Reexamination Certificate
active
09959413
ABSTRACT:
A method of making secure the use of a piece of software, the method consisting:in a substage of generating modified data (D′):for a first category of users possessing a generation unit (11g) including at least one generation secret (Sg) to be able to obtain modified data (D′); andfor a second category of users not possessing the generation unit (11g), to be able at best to generate original data (D) without being able to translate it in order to obtain modified data (D′); andin a substage of reconstituting original data (D):for a first category of users possessing a reconstitution unit including at least a reconstitution secret, to be able to restore the original data (D); andfor a second category of users not possessing the reconstitution unit, to be able at best to use the modified data (D′).
REFERENCES:
patent: 0191162 (1986-08-01), None
patent: 0768601 (1997-04-01), None
patent: 0795809 (1997-09-01), None
“Dea-based Pseudorandom Number Generator”, IBM Technical Disclosure Bulletin, US, IBM Corp. New York, vol. 35, No. 1B, Jun. 1, 1992, pp. 431-434.
Cuenod Jean-Christophe
Sgro Gilles
Chen Shin-Hon
Sheikh Ayaz
VALIDY
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