Assured Office - Version 4.1 Assured Office(AO) 4.1 is a desktop application which integrates seamlessly within the Windows environment and supports security frameworks of IE, Netscape and Entrust. Based on PKI technology, it allows for digital signing and encryption of electronic documents and files and supports applications like MSOffice and Adobe Acrobat. It also allows users to create graphic images of their handwritten signature to be added to the Signature Block during the signing operation. AO 4.1 also provides for online validation of digital certificates used for signing, verification, encryption and decryption.