Abstract
In this paper, we developed a secure system for issuing digital signature for digital documents and certificates using message digest algorithm (MD5). The developed system is providing the integrity and authentication for certificates by combining the information of participant and supply them to MD5 algorithm to produce a unique hash key of 32 digits which is hard to guess or attack. The process provides a certificate which allows for the authentication of a document at any time. The proposed system used and tested to produce digital certificate for participant of electronic seminars in Mustansiriyah university which were about 1000 certificate. The results were good and very fair to authenticate certificates and preventing forgery.
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