公开(公告)号：WO1994015421A1

公开(公告)日：1994-07-07

申请号：PCT/US1993011173

申请日：1993-11-17

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： BELL COMMUNICATIONS RESEARCH, INC. ,  HABER, Stuart, Alan ,  STORNETTA, Wakefield, Scott

IPC: H04L09/00

CPC classification number: G06Q20/38215 ,  G06Q20/389 ,  H04L9/3263 ,  H04L2209/60

Abstract: A cryptographic certificate attesting to the authenticity of the original document elements will lose its validity when the cryptographic function underlying the certifying scheme is compromised. The present invention extends the reliability of such a certificate by subjecting the combination of the original certificate and the digital representation of the document to a scheme based on a less vulnerable function using the steps of: obtaining the original document (11); applying the function to the document to create the original certificate (13); combining the original document and the certificate (15); and, applying another function to the combination to create an extended certificate (17).

Abstract translation: 证明原始文档元素的真实性的加密证书将在认证方案底层的密码功能受到损害时失效。 本发明通过使用原始证书和文档的数字表示的组合基于较不易受攻击的功能的方案来扩展这种证书的可靠性，使用以下步骤：获得原始文档（11）; 将该功能应用于文档以创建原始证书（13）; 结合原始文件和证书（15）; 并且将另一个功能应用于该组合以创建扩展证书（17）。

公开(公告)号：EP0676109A1

公开(公告)日：1995-10-11

申请号：EP94902285.0

申请日：1993-11-17

Applicant: BELL COMMUNICATIONS RESEARCH, INC.

Inventor： HABER, Stuart, Alan ,  STORNETTA, Wakefield, Scott

IPC: G09C1 ,  H04L9

CPC classification number: G06Q20/38215 ,  G06Q20/389 ,  H04L9/3263 ,  H04L2209/60

Abstract: A cryptographic certificate attesting to the authenticity of the original document elements will lose its validity when the cryptographic function underlying the certifying scheme is compromised. The present invention extends the reliability of such a certificate by subjecting the combination of the original certificate and the digital representation of the document to a scheme based on a less vulnerable function using the steps of: obtaining the original document (11); applying the function to the document to create the original certificate (13); combining the original document and the certificate (15); and, applying another function to the combination to create an extended certificate (17).