公开(公告)号：WO1996031834A1

公开(公告)日：1996-10-10

申请号：PCT/US1996004286

申请日：1996-04-01

Applicant: WASHINGTON UNIVERSITY

Inventor： WASHINGTON UNIVERSITY ,  INDECK, Ronald, S. ,  MULLER, Marcel, W.

IPC: G06K07/00

CPC classification number: G06K1/125 ,  G06F21/79 ,  G06K19/06187 ,  G06K19/12 ,  G11B5/00813 ,  G11B5/02 ,  G11B5/035 ,  G11B5/488 ,  G11B5/54 ,  G11B5/58 ,  G11B20/10009 ,  G11B20/1816 ,  G11B20/24 ,  G11B33/10

Abstract: Data recorded on a magnetic medium (22) may be securely identified and manipulated for use in credit balance applications by determining a magnetic fingerprint benchmark (26) on the medium as well as a distance (d) between this benchmark and any pre-selected magnetic feature such as a magnetic transition (28) of a data bit of the data set. Verification of the data may be achieved by measuring this distance and comparing it with the distance recorded at the time that the data was originally placed on the medium. As there is a detectable difference in accuracy between reading this distance as contrasted with illegitimate attempts to write false data at a pre-selected distance from the benchmark, attempts at forgery are detectable.

Abstract translation: 记录在磁性介质（22）上的数据可以通过确定介质上的磁性指纹基准（26）以及该基准与任何预先选定的磁性（26）之间的距离（d）被安全地识别和操纵用于信用平衡应用中 特征如数据组的数据位的磁转换（28）。 可以通过测量该距离并将其与在数据最初放置在介质上时记录的距离进行比较来实现数据的验证。 由于在读取此距离之间存在可检测的准确性差异，与非法尝试以基准预先选择的距离写入虚假数据相反，伪造的尝试可能被检测到。