Method and apparatus for securing and authenticating encoded...

Details Method and apparatus for securing and authenticating encoded... Method and apparatus for securing and authenticating encoded...

2007-01-09

2007-01-09

Moazzami, Nasser (Department: 2136)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C235S449000

Reexamination Certificate

active

09901920

ABSTRACT:
A method and apparatus for determining the distance between transitions from a first logical state to a second logical state stored on a medium (i.e., a document). This determination is used to precisely characterize the information pattern in order to authenticate the information and the medium on which the information is stored. The invention uses a reader having a leading and trailing read apparatus which allow information to be read simultaneously from two or more locations spaced a known distance apart. The distance between the centerlines of each read apparatus is preferably an odd integer multiple of one half the distance between logical clock transitions. The distance between a first transition at the leading read apparatus and a next transition at the trailing read apparatus is used as a reference (i.e., the “Reference Value”). The Reference Value is compared with the distance between the first transition and the next transition on the medium (i.e., the “Jitter Value”). Detection of an deviations in spacing between transitions is unaffected by variations in the velocity of the medium with respect to the reader.

REFERENCES:
patent: 5412718 (1995-05-01), Narasimhalu et al.
patent: 5514856 (1996-05-01), Kitahara et al.
patent: 5616904 (1997-04-01), Fernadez
patent: 5708851 (1998-01-01), Togawa

Affiliated with

Also associated with

Rating

Method and apparatus for securing and authenticating encoded... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for securing and authenticating encoded..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for securing and authenticating encoded... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3795953