Method and device for the prevention of disparities or error...

Details Method and device for the prevention of disparities or error... Method and device for the prevention of disparities or error...

2006-11-21

2006-11-21

Sheikh, Ayaz (Department: 2131)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S160000, C726S001000, C726S022000, C726S026000

Reexamination Certificate

active

07139913

ABSTRACT:
A method and device to prevent the creation of disparities in an interrogation-response system programmed in a first mode, the Mode 4 (M4) and interrogated in a second mode, a National Mode (NM), initially having a same message structure but a different enciphering key, the format of the message being constituted by a header followed by an information block separated by a time interval T. The method comprises at least one step in which the time interval T between the end of the header and the beginning of the information block is modified into a time interval Ti different from T.

REFERENCES:
patent: 3277466 (1966-10-01), Gardner
patent: 3949397 (1976-04-01), Wagner et al.
patent: 5822430 (1998-10-01), Doud
patent: 2 632 421 (1989-12-01), None

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