vb.net gs1 128 Public-Key Infrastructures and the X.509 Standard in Software

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Public-Key Infrastructures and the X.509 Standard
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As organizations plan for deploying PKIs, they have three basic options: outsourcing, insourcing, or running their own. With outsourcing, a third party runs a CA on behalf of the organization. This option requires the organization to have a great deal of trust in the third party and its policies and practices. The advantage of outsourcing is that the organization can leverage outside expertise and resources that it may not have inhouse. With insourcing, an organization provides its own resources, but the administrative staff is leveraged from outside. This option enables an organization to maintain control over its own CA policies while taking advantage of outside expertise. Many PKI vendors, including Entrust Technologies and Verisign, include this service in their standard offerings. Finally, it is possible for an organization to run its own CA. By using PKI-enabling products or building its own, an organization manages every aspect of the PKI. This option greatly benefits organizations that have in-house expertise, affording them the most flexibility and control over the system.
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The Future of PKI
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PKIs have grown considerably in the past decade as increasing numbers of organizations have become dependent on them. However, many improvements are in the works, not only by noncommercial organizations such as the International Organization for Standardization (ISO) and Internet Engineering Task Force (IETF) but also by many PKI vendors. Two such improvements are roaming certificates and attribute certificates, discussed in the next two sections.
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As you ve seen, standard certificates do a great job of binding an individual to a public key, but a new problem has arisen: the need for portability. It is not uncommon for a user to move among several computers within an organization. A certificate can be placed on every possible machine, but in order to be effective, the private key also must be present.
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Until recently, only two real solutions have provided the mobility of certificates and their corresponding private keys. The first is smart card technology, in which the public/private key pair is stored on the card. However, this option has drawbacks, such as the inconvenience of carrying an item that can be lost or damaged. In addition, smart cards are usable only on systems that have a smart card reader. The second option, which is not much better, is to copy the certificate and private key onto a floppy for later use. Again, the user is forced to carry an item that can be lost or damaged, and a floppy is not as cryptographically secure as a smart card. A new solution is the use of roaming certificates (perhaps better stated as roaming certificates and private keys), which are provided through third-party software. Properly configured on any system, the software (or plug-in) enables a user access to his or her public/private key pairs. The concept is simple. Users certificates and private keys are placed in a secure central server. When the user logs into a local system, the public/private key pair is securely retrieved from the server and placed in the local system s memory for use. When the user has completed work and logs off of the local system, the software (or plug-in) scrubs the user s certificate and private key from memory. To date, this technology has been limited mainly to private PKIs, such as corporations, because of scalability issues. However, as roaming applications and users become more prevalent, it s conceivable that roaming certificate technology will be developed into a cost-effective way of providing virtual PKIs worldwide. Figure 6-9 illustrates the interaction of common roaming certificate systems.
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Figure 6-9 Roaming certificates
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Host system
Credential server
Credential directory
Internet
Secure transport
Public-Key Infrastructures and the X.509 Standard
NOTE:
Although the concept of roaming certificates has proven quite useful, some standards do not support this technology. One such standard is ANSI X9.57, which requires that private keys used for the purposes of nonrepudiation be created, used, and destroyed within one secure module.
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