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Although digital and written signatures can serve the same purposes, there are obvious physical differences. Let s look at the differences between the signatures applied to written and digital documents.
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Traditionally, someone s signature on a literal document authenticates the origin of the data contained in it. Because people sign various documents during their lifetimes, their signatures become a part of their identity over time. By using a unique combination of pencil strokes that is very difficult for anyone else to forge, they can sign anything, almost without thinking. Additionally, loan certificates (and other documents that may have legal force) have been designed to guard against forging of a signed document. Examples include documents that use watermarks, embossing, and special ink treatment, all of which provide protection against photocopies and other forgeries.
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Electronic documents can easily be copied and modified without detection. To generalize this consideration, digital information is usually defined (loosely) as the kind of information not bounded to any concrete carrier, such as the ink on a piece of paper. Additionally, the digital information lacks personality (a file saved by someone can be easily updated by someone else having the appropriate permissions). Clearly, the traditional methods of signing by appending the signature to an existing document do not work for electronic documents. Anyone can simply modify the document and append the same signature to it.
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Requirements for the Use of Digital Signatures
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For current digital signature legislation to withstand the test of litigation, a number of important issues must be resolved. The American Bar Association s Guidelines for Digital Signatures is an excellent foundation, but corporations and individuals might wish to focus on concerns not addressed in the guidelines. The following sections describe those requirements, which are essential if digital signatures are to stand up.
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10
Public Key Infrastructures
To effectively incorporate digital signatures within an e-commerce framework, an organization should create and maintain a public-key infrastructure (PKI), as described in 6. To a point, having a PKI ensures that only valid keys are used in signing and verifying electronic documents. The PKI must enforce policies whereby properly administered certification authorities (CAs) and registration authorities (RAs) are used, requiring end users to show reliable proof that authenticates them. Furthermore, public-key certificates can be housed in a central location that can be accessed by any relying party. Finally, a PKI serves to revoke or suspend certificates as needed.
Control of Key Revocation
Another important issue related to the use of digital signatures is the management of private signature keys. If an unauthorized person gains access to a private key, the thief will be able to forge the owner s signature on electronic documents. To prevent this, a user should be able to revoke a compromised signature key in the public directory. Here are some guidelines:
All users should be able to revoke their public keys from the directory at any time. For this policy to work, CAs should save (in the public directory) information about all revoked keys. An authority should be able to revoke the signatures issued for its employees. A separate CA could certify digital signatures for employees of a given company. Online Certificate Status Protocol (OCSP), which was explained in 6, should be used to ensure that verifiers receive the most current revocation status.
Time-Stamping
Another issue is time-stamping. Digital signatures provided through the use of public-key technology can be called into question for a simple reason: If the signer of a particularly important document (for example, a
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loan agreement) later wishes to repudiate her signature, she can dishonestly report the compromise of her private key and ask it to be revoked. A later verifier will not be able to certify whether the signing happened before or after the revocation. Time-stamping is a set of techniques that enable you to ascertain whether an electronic document was created or signed at (or before) a certain time. In practice, most time-stamping systems use a trusted third party called a time-stamping authority (TSA). A time stamp is the TSA s digital attestation that an identified electronic document was presented to the TSA at a certain time. A time-stamping service (TSS) is a collection of methods and techniques providing long-term authentication of digital documents. The object of a TSS is to authenticate not only the document but also the moment in time at which the document is submitted for authentication. Figure 10-1 illustrates the interaction between end-users and a trusted time-stamping server available from Datum.
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