Enabled by proven public key infrastructure (PKI) technology, digital signatures are widely recognized as a best practice for providing digital verification of electronic transactions. Digital signatures provide 'non-repudiation' — the ability to identify the author and whether the document has been changed since it was digitally signed. This functionality is particularly useful for workflow processes where one or multiple approvals are required, such as supply-chain management or financial management of forms like expense reports. Digital signatures provide confidence to customers, citizens and consumers that the material actually came from the originating organization. Depending on organization requirements, Entrust can help with a variety of solutions for the implementation of digital signatures. Entrust Certificates for Adobe CDS enable the signing of Entrust Document Signing Certificates, while digital certificates from Entrust Managed Services PKI can sign a variety of formats, and include authentication and encryption functionality. Entrust also offers secure e-statement delivery via the Entelligence product portfolio. We are all familiar with paper signatures - a hand-written signature on a paper document. Aside from legal and contractual issues, the primary properties of a paper signature are: it is intended to be associated with a particular individual; it generally shows a commitment related to a particular document, with the exact meaning depending on context. Though far from perfect, paper signatures serve surprisingly well in many parts of the world as the basis for business and legal transactions. Societies have learned to use paper signatures in circumstances in which a physical marking on a paper document, augmented by sufficient controls and context, provides sufficient recallable evidence of a commitment related to that document by the marking party. The evidence is important in order to reconstruct circumstances, in the rare case of later disputes.