Methods and apparatus to authenticate a document
    1.
    发明申请
    Methods and apparatus to authenticate a document 审中-公开
    验证文档的方法和设备

    公开(公告)号:US20050166052A1

    公开(公告)日:2005-07-28

    申请号:US10764645

    申请日:2004-01-24

    IPC分类号: G06T1/00 H04L9/00 H04L9/32

    摘要: In one representative embodiment the present invention provides for a method of generating an authentication key that can be used to authenticate an electronic document file representative of a document. The method includes providing the electronic document file as an initial digital file, and applying a predetermined halftoning process to the digital file to generate a digital halftone file of a plurality of discrete digital values. A predetermined mathematical process is then performed on the plurality of discrete digital values to thereby generate the authentication key.

    摘要翻译: 在一个代表性实施例中,本发明提供了一种生成可用于认证代表文档的电子文档文件的认证密钥的方法。 该方法包括将电子文档文件提供为初始数字文件,并将预定的半色调处理应用于数字文件以生成多个离散数字值的数字半色调文件。 然后对多个离散数字值执行预定的数学处理,从而生成认证密钥。