| 摘要 |
A method and apparatus of secure transmission of digital data relating to a document between any of a scanner, a printer and a host computer such as a user workstation. <??>At a sending station, a document file is generated or otherwise specified and a user-defined character string is inputted by an operator in the local user interface. Then, the sending station automatically forms an encryption key based on said user-defined character string and encrypts document file therewith. However, one or more predetermined specifying header items of the file are not encrypted, to facilitate recognition and handling of the file. <??>A transmission file, including the encrypted document file, is then transmitted towards a receiving station, where the encrypted document file is decrypted on the basis of the same user-defined character string as was entered at the sending station, when the latter is entered in the local user interface of the receiving station. <??>Even though the transmission file is encrypted, the unencrypted header items enable file handling, such as routing, and accounting. <IMAGE>
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