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mechanism requires that a user be in possession of the token and additionally may require the user to know a PIN or password. These devices then perform a challenge/response authentication scheme using real-time parameters. The latter practice helps prevent an intruder from gaining unauthorized access through a login session playback. These devices may also encrypt the authentication session, preventing compromise of the authentication information through monitoring and capturing. Locking mechanisms can be used for network devices, workstations, or PCs, requiring user authentication to unlock. These tools can be useful when users must leave their work areas frequently. These locks allow users to remain logged in to the network and leave their work areas (for an acceptably short period of time) without exposing an entry point into the network.
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Because access control through the use of proper authentication is not always possible (because of shared drives and open networks), data confidentiality services can be used when it s necessary to protect the secrecy of information. The use of encryption through symmetric or asymmetric ciphers (or both) can reduce the risk of unauthorized disclosure, both in the case of data at rest and data in transit, by making it unreadable to those who may capture it. Only the authorized user who has the correct key can decrypt the data.
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Data integrity services provide protection against intentional and accidental unauthorized modification of data. This service can be used for data while it is at rest on a back-end database or while it is in transit across a network. This service can be provided by the use of cryptographic checksums and highly granular access-control and privilege mechanisms. The more granular the access-control or privilege mechanism, the less likely it is that an unauthorized or accidental modification can occur. Furthermore, data integrity services help to ensure that a message is not altered, deleted, or added to in any manner during transmission across a network. Most available security techniques cannot prevent the modification of a message, but they can detect that a message has been modified (unless the message is deleted altogether).
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Nonrepudiation helps to ensure that the entities in a communication cannot deny having participated in all or part of the communication. When a major function of the network is electronic mail, this service becomes crucial. Nonrepudiation services can be provided through the use of publickey cryptographic techniques using digital signatures.
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Throughout this book, we ve described a number of standards, guidelines, and regulations. For example, 6 explains how the X.509 standard can be used to provide for secure public-key operations, and 7 describes the SSL and IPSec protocols, which are used to provide various security services. The following sections outline the various organizations that have made the effort to ensure that each standard, guideline, and regulation provides for a proper security implementation.
The Internet Engineering Task Force
The Internet Engineering Task Force (IETF) is an international community of network designers, operators, vendors, and researchers. This group is concerned with the smooth operation of the Internet and the evolution of the Internet architecture. The technical work of the IETF is done in its working groups, which are organized by topic into several areas (routing, transport, security, and so on). The working groups are managed by area directors (ADs), who are members of the Internet Engineering Steering Group (IESG). Providing architectural oversight is the Internet Architecture Board (IAB). The IAB also adjudicates appeals when someone complains about the policies adopted by the IESG. The IAB and IESG are chartered by the Internet Society (ISOC) for these purposes. The general area director also serves as the chair of the IESG and of the IETF and is an ex officio member of the IAB.
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