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By Sokratis Katsikas

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The main advantage offered by public-key technology is increased security. Although slower than some private-key systems, public-key encryption generally is more suitable for modern applications, like electronic commerce, for it is more scalable to very large systems, it has a more flexible means of authentication, it can support digital signatures, and it enables non-repudiation procedures. In the following sections we will describe concrete approaches of using public and private key encryption technologies for guarding against disclosure, fabrication, modification, and repudiation.

The protection mechanisms of the OS have to maintain the integrity of the audit log, so that once a security problem arises the event can be tracked to the perpetrator. Auditing is truly after-the-fact technique. Specifically, audit trails reinforce the use of security countermeasures by giving the security administrator a list of evidence to use in the prosecution of computer crime. Most Web browsers keep a complete log of all transactions carried out. However, due to HTTP limitations coupled with privacy protection constraints the logs typically do not include the identity of the user who initiated a transaction, but only the name of the respective host.

The overall goal of our security architecture is to manage access control in a large intranet. This is realized by the authorization service shown at the top of Figure I. The purpose of this service is to determine whether a user has the right to access a specified resource. This decision is usually based on some sort of access control list, which can be used to determine the privileges of a given user with regard to the resource accessed. The authorization service depends on the following supporting components of our framework.

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