| 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. 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. No check is done on the validity of the entered character string other than trying to process the decrypted file, but when an incorrect character string is entered, the output of the decryption is useless. <IMAGE> |
