Document management method and apparatus, and recording medium therefor

摘要

The seal mark information that system manager 100 encoded with the cryptographic key that seal mark management equipment 101 manages according to a requirement of employee 110 is embedded in the mark of seal image design that employee 110 created and transmitted. A public key being necessary for decoding is attached to a seal mark or distributed to outside system manager 100N associated with employee terminal 111 inside company in advance Because the received side can be confirmed if it is embedded in a seal mark with a public key distributed in advance or a public key attached to a seal mark, document certification, an original and validity can be controlled, and can be confirmed on the network. <IMAGE>