Arrangement for protecting against the unauthorized reading of p

Details Arrangement for protecting against the unauthorized reading of p Arrangement for protecting against the unauthorized reading of p

1983-05-04

1986-04-22

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 704, G06K 700

Patent

active

045846650

ABSTRACT:
The unauthorized reading of program words stored in a memory of a dating processing system is counteracted by supplying the unauthorized reader with nuisance data from a data source instead of program words from the memory. In order to determine whether the memory is being read by an unauthorized reader or by a data processor unit of the system for the execution of the program, use is made of the sequence in which the data processor unit reads the program words from the memory. This sequence deviates from the sequence in which the program words are stored in the memory. Additional information is added to each program word stored in the memory, said additional information containing an indication of a subsequent program word to be read by the data processor unit. On the basis of this additional information it is tested whether the memory is being read in the sequence determined by the data processor, for the execution of the program, or in some other sequence by an unauthorized reader who does not know the sequence determined by the data processor unit.

REFERENCES:
patent: 3806882 (1974-04-01), Clarke
patent: 3996449 (1976-12-01), Attanasio et al.
patent: 4183085 (1980-01-01), Roberts et al.
patent: 4271482 (1981-06-01), Giraud
patent: 4446519 (1984-05-01), Thomas

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