assure that the message has not been changed either by accident or intentionally. In addition, secure Digital Signature cannot be repudiated, which means that the signer cannot deny its signature by claiming it was forged. Thus Digital Signature enable authentication of Digital message by assuming both the Id of the sender and the integrity of the message.So Digital Signatures need Digital Ids to assure what this later cannot.Software compatibility.Certificates, both for individual users or for server application can operate within special software.1- Individual use: - Microsoft Internet Explorer 3.02 (with Authenticode 2.0) - Microsoft Internet Explorer 4.x - Microsoft Internet Explorer 5.0 - Microsoft Outlook Express - Microsoft Outlook 98 - Netscape Communicator 4.0 - Opera 3.52- Server application: - Apache SSLeay - Apache Stronghold - Microsoft IIS4 - Netscape Entreprise Server 3 - OpenMarket Transact 4 - ZeusConclusion.As human, we establish trust all the time in people we know or whose voice or face are recognizable, and depending on how much we know them, we decide whether to believe their information or not. In electronic life, unfortunately, this is not the case. As long as business is business, trust on the net cannot be performed unless by undergoing special rules and procedures which provide all possible required mean of security which certificates and Digital Signatures are two of them, providing more than an averaged secure tool, even in the presence of some problems....
