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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.

F I G U R E 2-7

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:

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The payroll is generally recorded initially in the general journal. Since the payroll register is the input for the entry, it is generally totaled for the payroll period and proved before any entry is made. Employers are required to pay unemployment taxes to both the fed eral and state governments. Although the typical state unemployment tax rate is 5.4 percent, rates vary depending on the state, nature of the busi ness, and the employer s experience with unemployment. The of cial

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.

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

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.

federal unemployment tax rate is 6.2 percent. As long as the employer is up to date on the state tax, the employer is allowed an automatic credit of 5.4 percent no matter what rate the employer actually pays. The effective federal unemployment rate is therefore 0.8 percent.

Long-position coupon 6 % Time to maturity 5 years Instrument-specific parameters: Duration Rating Currency Long/short position, etc. instrument-specific parameters: Duration Rating Currency Long / short position, etc.

be received by a recipient that is not S/MIME-compliant, rendering the original content unusable. To counter this problem, S/MIME uses an alternative structure, the multipart/signed MIME type. The body of the multipart/signed MIME type is made up of two parts. The first part, which can be of any MIME content type, is left in the clear and placed in the final message. The contents of the second part are a special case of signed data, known as a detached signature, which omits the copy of the plaintext that may be contained within the signed data. Figure 8-4 illustrates the S/MIME clear-signed data process.

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