电子文档中嵌入和提取文本的方法

    公开(公告)号:CN1394313A

    公开(公告)日:2003-01-29

    申请号:CN01803422.5

    申请日:2001-11-02

    Inventor: 崔钟昱 崔基哲

    Abstract: 本发明涉及一种使用文本嵌入的方式对各种数字证书进行认证的方法和装置。根据证书的特性,本发明的方法的执行分为两种情况:一种情况是证书中包含图象,另一种情况是证书中不包含图象。前一种情况中,对证书中所含的图象使用一种嵌入文本的方法,将由证书发行者指定的一组信息文本(证书的特定号码,发行证书的组织,或者负责人的名字等)嵌入到图象中。在后一种情况中,将生成一幅人眼不可觉察但与证书背景具有相同颜色的图象。

    COLLUSION-ROBUST WATERMARKING
    25.
    发明申请

    公开(公告)号:WO2003071533A1

    公开(公告)日:2003-08-28

    申请号:PCT/IB2003/000215

    申请日:2003-01-21

    Abstract: Watermark embedding is often used to identify multiple copies (Qi) of the same content (Q). Each copy (Qi) is provided with a different private watermark (Wi) which, for example, identifies the player on which that copy may be reproduced. Private watermarks can be hacked. Averaging two or more watermarked copies may cause any ofthe private watermarks to become undetectable. The watermark embedder (10) in accordance with the invention embeds a global (fixed) watermark (W) in addition to the private watermark (Wi). The global watermark is the same in each copy and therefore remains detectable. Its presence indicates that a private watermark shall be present as well. It can be used in a protocol like: no playback allowed if the global watermark is present and a private watermark is not found.

    Abstract translation: 水印嵌入通常用于识别相同内容的多个拷贝(Qi)(Q)。 每个副本(Qi)被提供有不同的私有水印(Wi),其例如标识可以再现该副本的播放器。 私有水印可能被黑客入侵。 平均两个或更多水印的副本可能导致任何私有水印变得不可检测。 根据本发明的水印嵌入器(10)除了私有水印(Wi)之外还嵌有全局(固定)水印(W)。 全局水印在每个拷贝中是相同的,因此保持可检测。 它的存在表明私有水印也应该存在。 它可以在如下协议中使用:如果存在全局水印并且没有找到私有水印,则不允许播放。

    SECURE DISTRIBUTION OF DIGITAL REPRESENTATIONS
    27.
    发明申请
    SECURE DISTRIBUTION OF DIGITAL REPRESENTATIONS 审中-公开
    数字代表的安全分配

    公开(公告)号:WO99041900A1

    公开(公告)日:1999-08-19

    申请号:PCT/IB1999/000393

    申请日:1999-02-09

    Abstract: Techniques for secure distribution of digital representations that combine encryption and watermarking. When a user at a client desires to download a digital representation, the user makes a request to a server for the digital representation, which encrypts the digital representation using a first key and downloads the encrypted digital representation to the user. Before the user performs any operation on the decrypted digital representation, a secret fingerprint watermark identifying the user is added to the digital representation. The fingerprint watermark is added either at the server or at the client and a copy of the fingerprinted digital representation is kept at the server. If the user makes an impermissible use of the digital representation, the secret fingerprint watermark can be used to identify the user. The request made by the user indicates the type of use that the user whished to make of the digital representation. If the use involves storage of the digital representation at the client, the server provides a second key that the client employs to encrypt the digital representation. If the user has permission to do so, the user may modify the digital representation and return the modified digital representation to the server for further distribution. In this case, the second key is used to encrypt the digital representation when it is sent to the server. The second key also serves as the user identification in the fingerprint watermark. If the user loses the second key, it can be recovered from the copy of the fingerprinted digital representation kept at the server. The first and second keys and any decrypted copy of the digital representation are kept in secure storage in the client.

    Abstract translation: 用于安全分发加密和水印的数字表示的技术。 当客户端的用户希望下载数字表示时,用户向数字表示服务器发出请求,数字表示使用第一密钥加密数字表示,并将加密的数字表示下载给用户。 在用户对解密的数字表示执行任何操作之前,将标识用户的秘密指纹水印添加到数字表示。 指纹水印在服务器或客户机中被添加,并且指纹数字表示的副本被保存在服务器上。 如果用户不允许使用数字表示,则可以使用秘密指纹水印来识别用户。 用户发出的请求指示用户想要进行数字表示的使用类型。 如果使用涉及在客户端处存储数字表示,则服务器提供客户端用于加密数字表示的第二密钥。 如果用户具有这样做的权限,则用户可以修改数字表示并将修改的数字表示返回到服务器以进一步分发。 在这种情况下,第二个键用于在发送到服务器时对数字表示进行加密。 第二个键也用作指纹水印中的用户标识。 如果用户丢失第二个密钥,则可以从保存在服务器上的指纹数字表示的副本中恢复。 数字表示的第一个和第二个键和任何解密的副本都保存在客户端的安全存储中。

    METHOD FOR CERTIFYING AND SUBSEQUENTLY AUTHENTICATING ORIGINAL PAPER OR DIGITAL DOCUMENTS FOR THE CONSTITUTION OF EVIDENCE
    28.
    发明申请
    METHOD FOR CERTIFYING AND SUBSEQUENTLY AUTHENTICATING ORIGINAL PAPER OR DIGITAL DOCUMENTS FOR THE CONSTITUTION OF EVIDENCE 审中-公开
    证明和随后认证原始文件或数字文件以构成证据的方法

    公开(公告)号:WO2007077324A8

    公开(公告)日:2007-08-30

    申请号:PCT/FR2006002799

    申请日:2006-12-19

    Abstract: The present invention relates to a method for certifying and subsequently authenticating original physical or digital documents. The concept of the evidence lies in the dual nature of a physical information item and a digital information item, one being the reference for the other that cannot be amended at the risk of the evidence being lost. For a physical original document (8) associated with a bubble seal (7) there is a corresponding time-and-date-stamped, proprietary paperless reference counterpart. For a time-and-date-stamped, proprietary digital original document (15) there is a corresponding reference counterpart in the form of a bubble seal (7).

    Abstract translation: 本发明涉及用于证明和随后认证原始物理或数字文件的方法。 证据的概念在于实体信息和数字信息的双重性质,一方面是另一方面的参考,在证据丢失的风险下不能修改。 对于与气泡密封(7)相关联的物理原始文档(8),存在相应的时间和日期标记的专有无纸参考副本。 对于时间和日期标记的专有数字原始文档(15),存在以泡沫密封(7)的形式的相应参考对应物。

    METHOD FOR EMBEDDING AND EXTRACTING TEXT INTO/FROM ELECTRONIC DOCUMENTS
    29.
    发明申请
    METHOD FOR EMBEDDING AND EXTRACTING TEXT INTO/FROM ELECTRONIC DOCUMENTS 审中-公开
    嵌入和提取电子文档文本的方法

    公开(公告)号:WO02037309A1

    公开(公告)日:2002-05-10

    申请号:PCT/KR2001/001862

    申请日:2001-11-02

    Abstract: The present invention relates to a method and apparatus for authenticating various types of digital certificates by using a text embedding method. The execution of the present invention is divided into two cases, one case including images in the certificate and another case not including the images in the certificate, according to the characteristic of the certificate. In the former case, a text embedding method is applied to images included in the certificate to embed a series of information text (a specific number of the certificate, and issuing organization, name of a person in charge, etc.) designated by a person who issues the certificate into the images. In the latter case, there is generated an image imperceptible to the human eye but having the same color as the ground color of certificate.

    Abstract translation: 本发明涉及一种通过使用文本嵌入方法来认证各种类型的数字证书的方法和装置。 根据证书的特征,将本发明的执行分为两种情况,一种情况包括证书中的图像和不包括证书中的图像的另一种情况。 在前一种情况下,将文本嵌入方法应用于包含在证书中的图像,以嵌入一系列信息文本(特定号码的证书,发行组织,负责人的姓名等),由人指定 谁将证书发布到图像中。 在后一种情况下,产生了人眼不可察觉但具有与证书的底色相同的颜色的图像。

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