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1.3.1 Data integrity 18 Lotus Security Handbook Data integrity can be summed up as the following: ► The condition existing when data is unchanged from its source and has not been accidentally or maliciously modified, altered, or destroyed [INFOSEC-99] ► The condition in which information is identically maintained during any operation, such as transfer, storage, and retrieval ► The preservation of information for its intended use Specific to the <strong>IBM</strong> architecture, data integrity can also be said to provide detection of the unauthorized modification of data. Data integrity can be compromised in a number of ways, not all of them being specifically due to an error in the security services provided as part of the IT infrastructure. For example, lack of data integrity occurs when: ► Human errors are made when information is entered ► Transmission errors occur when information is transmitted from one computer to another ► Software bugs occur or viruses actively target the information ► Hardware malfunctions, such as hard disk crashes ► Natural disasters occur, such as fires, floods, and earthquakes To ensure data integrity, organizations must allow for the use of data by authorized users and applications, as well as the transmission of data for remote processing, while at the same time, ensuring that this information is not altered by unauthorized users. Data integrity facilities can indicate whether information has been altered. There are many ways to minimize these threats to data integrity. These include, but are not limited to the following: ► Backing up data regularly ► Controlling access to information via security mechanisms ► Designing user interfaces that prevent the input of invalid data ► Using error detection and correction software when transmitting data
1.3.2 Confidentiality Confidentiality can be summed up as the following: ► Assurance that information is not disclosed to unauthorized persons, processes, or devices. [INFOSEC-99] ► In regard to classified or sensitive information, the degree to which the information has not been compromised, in that it has not been made available or disclosed to unauthorized individuals, processes, or other entities Specific to the <strong>IBM</strong> architecture, confidentiality can be said to protect sensitive information from disclosure. When it is stored locally, sensitive data can be protected by access controls or encryption mechanisms. For network communication security, sensitive data should be encrypted as it is transmitted from system to system. There are specific ISO standards (8730, 8731, and 9564) relating to use of cryptography for confidentiality and data integrity. 1.3.3 Identification and authentication Identification and authentication (I&A) facilities verify the identity of individuals. The basic function uniquely identifies users and programs, verifies these identities, and assures individual accountability. In other words, identification and authentication is required to ensure that users are associated with the proper security attributes (for example, identity, groups, roles, security or integrity levels). The unambiguous identification of authorized users and the correct association of security attributes with users and subjects is critical to the enforcement of the intended security policies. The security services and facilities in this class deal with determining and verifying the identity of users, determining their authority to interact with key components of the IT Infrastructure, key components of the computer system, or key information handled by software running on the computer system (for instance, a document in a Notes database), based on the correct association of security attributes for each authorized user. These are all dependent upon correct identification and authentication of users in order to be effective. Authentication may take many forms, such as: ► Simple authentication, for an individual user of the computer system, which is generally based on a user ID and a password. This is generally the weakest form of authentication. Chapter 1. Fundamentals of IT security 19
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* Notes SDK include files */ #inclu
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* *********************************
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Hostname="localhost.dotnsf.com" Por
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