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While signing, the functionalities are to prompt a list of user certificates

 . 2 Cross-platform Web Browser The third design requirement is the digital signature must be available in all cross-platform web browsers. ...

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2 Cross-platform Web Browser The third design requirement is the digital signature must be available in all cross-platform web browsers. This includes Internet Explorer, 


Google Chrome and Mozilla Firefox. As a result, a dedicated web extension for each web browser is built. Web extension for Internet Explorer is using ActiveX technology. For Google Chrome, technology applied is a Chrome extension and native messaging. For Mozilla Firefox the technology is ‘Add-on’. These web extension technologies are built using multiple languages; C++, JavaScript, and combination thereof. 2.3. Identical Core Functionalities Across all Web Browser The functionalities of the digital signature solution are described in three phases, data before signing, data while signing and data after signing. Prior to sign, the functionalities are to present the data to be signed to a user, hash the data to sign using the SHA-256 algorithm and add a button to sign the data. 


While signing, the functionalities are to prompt a list of user certificates available on the web browser, view the content of the selected certificate and present a PIN dialogue for the user to access the private key and compute the digital signature using RSA 2048-bit key operation. After signing, the functionalities are to present the signature and the status of the digital signature. The format of the digital signature is a raw, PKCS#1 padded digital signature. Verification of the digital signature is assisted with a user’s public key and result in a cryptographic hash value. This hash value will then be compared to the hash value of the data to sign. The signature verification is achieved without the presence of hardware-based tokens. The prementioned core functionalities are required to be uniformly featured in all web browsers. Hence, to support cross-platform web browsers, the codes of web extension for each of web browsers, must provide identical functions, inputs, and outputs. The five main functions across all web browsers are performing sign on a hash value, get signature value, get user certificate value, get status of digital signing and get a web extension version.

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