公开(公告)号：GB2358115A

公开(公告)日：2001-07-11

申请号：GB0022614

申请日：2000-09-15

Applicant: IBM

Inventor： BRAUDAWAY GORDON WESLEY ,  HOWARD PATRICK D ,  KAMESAM PASUMARTI VENKATA ,  MINTZER FREDERICK COLE ,  SACHAR HOWARD EDWARD ,  SMITH SEAN WILLIAM ,  SOCOLOFSKY JOHN MARK ,  TRESSER CHARLES PHILIPPE LOUIS ,  WU CHAI WAH

IPC: G03G21/04 ,  G07F17/26 ,  H04N1/32 ,  H04N1/44 ,  H04L9/30

Abstract: A communication link is provided between a certified document owner and a remote printing station. The printing station is provided with a leaf of special paper and determines whether the leaf is legitimate by comparing a representative number and its encrypted version (encrypted using a first key) at locations on the leaf Extra hidden data may also be provided on the leaf for checking its authenticity. The printing station transmits the representative number and its encrypted version to the certified document owner who can also perform the authenticity check. The certified document owner appends a document with the representative number, computes a digitally signed version of the appended document (using a second key) and transmits the document and the signed version to the printing station for printing. As such, further unauthorised prints of this document as well as copies of this document can be recognized as non-authentic. The printer used does not need to be specialised with security controls.