Computer file integrity verification

Details Computer file integrity verification Computer file integrity verification

1998-01-22

2000-09-19

De Cady, Albert

Electrical computers and digital processing systems: support

Computer program modification detection by cryptography

713176, 713189, 380 25, 714758, G06F 900

Patent

active

061227382

ABSTRACT:
System and method for verifying the integrity of contents within a computer file. A security value S is stored within the file. A verification function f is applied against the entire contents of the file including S, where f is a function of S. Results R of the applying step are compared against a preselected value r, where r is not stored within the file. When R equals r, a determination is made that the file has not been modified. f is typically a distributive invertible function such as the Cyclic Redundancy Check (CRC) function known as modulo p, where p is a prime number and is one bit greater than the length of S. Typically, the value of r is zero. Before executing the verification function f, a check generating program is first executed. This check generating program is executed by a computer that is remote from the file, further enhancing the security of the system.

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