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    • 3. 发明申请
    • METHOD AND APPARATUS FOR SECURING AND AUTHENTICATING ENCODED DATA AND DOCUMENTS CONTAINING SUCH DATA
    • 用于保护和认证包含此类数据的编码数据和文档的方法和装置
    • US20080028460A1
    • 2008-01-31
    • US11842097
    • 2007-08-20
    • CLAY VON MUELLERRobert Mos
    • CLAY VON MUELLERRobert Mos
    • H04L9/32
    • G06K7/0008G06K7/084
    • 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.
    • 一种用于确定从存储在介质(即文档)上的第一逻辑状态到第二逻辑状态的转换之间的距离的方法和装置。 该确定用于精确地表征信息模式,以便认证信息和存储信息的介质。 本发明使用具有前导和后置读取装置的读取器,其允许从间隔已知距离的两个或多个位置同时读取信息。 每个读取装置的中心线之间的距离优选地是逻辑时钟转换之间的距离的一半的奇整数倍。 前导读取装置的第一转换与尾部读取装置的下一个转换之间的距离用作参考(即“参考值”)。 将参考值与介质上的第一转换和下一转换之间的距离(即“抖动值”)进行比较。 检测转换间距的偏差不受介质相对于读取器的速度的变化的影响。