Realization of Electronic Official Seal System Based on WORD

The paper describes a new electronic official seal system scheme based on the technologies of MD5, RSA and USBkey. In order to guarantee the reliability of transmitting data, the system develops the toolbar by utilizing VBA to found the toolbar object in WORD and calling CryptoAPI to realize encryption and decryption, and USBkey is applied to save the key and the digital certificate. Moreover, we combine USBkey with the dynamic password, so that the PIN code could be produced dynamically. According to the experimental results, the storage and transmission of documents are much simpler in electronic form and are more inclined to be accepted by users. The system guarantees the validity, authentication and non-repudiation of the documents. Therefore, the system is of great value in electronic commerce, electronic government and other electronic official fields.