发明名称 |
METHOD OF AUTHENTICATING A PLURALITY OF FILES LINKED TO A TEXT DOCUMENT |
摘要 |
A method of authenticating a text document with links to a plurality of files by modifying at least a selected attribute of invisible characters on a plurality of inter-word intervals of the text document, this method comprising the steps of computing (step 10 ) a one-way hash function of each file in order to obtain a hash value composed of a subset of hash digits for each one, encoding (step 16 ) each subset of a plurality of subsets of space characters in the document by replacing in each subset of space characters, the value of the selected attribute for each space character by a corresponding encoded hash digit of each subset of hash digits corresponding to each file, computing (step 18 ) the electronic signature of the encoded text document by using a public-key algorithm composed of a subset of signature digits, and encoding (step 20 ) another subset of space characters in the encoded document by replacing the value of the selected attribute for each space character by a corresponding encoded signature digit. |
申请公布号 |
EP1396142(B8) |
申请公布日期 |
2005.06.08 |
申请号 |
EP20020764596 |
申请日期 |
2002.06.04 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION;IBM FRANCE |
发明人 |
CARRO, FERNANDO, INCERTIS |
分类号 |
G06F21/62;H04N1/32;(IPC1-7):H04N1/32 |
主分类号 |
G06F21/62 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|