Protecting digital goods using oblivious checking

Details Protecting digital goods using oblivious checking Protecting digital goods using oblivious checking

2006-02-10

2008-11-04

Kincaid, Kristine (Department: 2139)

Electrical computers and digital processing systems: support

Computer program modification detection by cryptography

C713S193000, C713S194000, C726S026000, C726S027000

Reexamination Certificate

active

07447912

ABSTRACT:
Oblivious checking of a digital good is performed by identifying a plurality of key instructions within a function of a digital good. Each key instruction is an instruction that possibly modifies a register or a flag. An extra instruction is then inserted into the function for each of the key instructions. The extra instructions each correspond to one of the key instructions and modify a register in a deterministic fashion based on the corresponding key instruction. A set of inputs to the function are then identified that result in different valid computation paths in the function being taken. A checksum for the function is then generated by using a mapping function which maps the contents of the register to the set of inputs.

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