ee4215_c3 - Preventive Security Approaches Content Two main...

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Unformatted text preview: Preventive Security Approaches Content Two main approaches Security Mechanisms Auditing Identification Encryption Key Management Access Control Privilege Selection Principles Security Kernel Configuration management Formal Method Enhanced life cycle 3.1 Two Main Approaches Safeguard is defined as any mechanism or procedure to mitigate the effect of a threat before it can occur Countermeasure is defined as any mechanism or procedure to mitigate the effect of a threat that has already occurred 3.1.1 Safeguards Integrated into Design introduce safeguard in its earliest stage Avoids Disastrous Threats life critical operations requires early safeguard Possible Waste of Resource additional resources must be justified Difficult to Measure Success uncertainty exists for the practical issues 3.1.2 Countermeasures Based on acted on EMERGENCY , teams will be formed to respond to the emergency. Advantages: Possibly Avoids Waste of Resources Easier To Measure Success Drawbacks: Allows Threats to Occur 3.2 Security Mechanisms Auditing and Intrusion Detection Identification, Authentication and Passwords Encryption Key Management Protocols Mandatory and Discretionary Access Control Privilege Security Kernels Configuration Management, Formal Methods and Enhanced Life Cycle Activities Classifications Preventive: Auditing, Intrusion Detection, Identification and Authentication and Encryption Logistic: Passwords , Key Management Protocol , Mandatory and Discretionary Access Control, Privilege and Security Kernels ( chapter 4 ) Others: Configuration Management, Formal Methods and Enhanced Life Cycle Activities 3.2.1 Auditing Concept: The method involves the use of automated mechanisms and associated procedure that cause a record of computer system activity to be automatically created and stored in a protected, computerized log. The log provides a means of identifying the time, source and other important characteristics of a given attack 3.2.1.1 Auditing Requirements Mechanisms and Procedures automatic obtaining computer activity and placing it in a protected log manual logging is not acceptable for on-line auditing Recording of Relevant Activity activities about potential malicious attacks must be included ideally all types of activities are included Minimal Effect on Functionality the auditing procedure should not introduce harmful or undesirable effects to the normal functionality of system Audit Record Format A well-defined format of audit records are required for data interpretation such as IEEE POSIX Records in Protected Log records are use to reconstruct the attack hence protection is very crucial. If protection cannot be introduced, effort should be made to avoid illegal modifications of audit record 3.2.1.2 Operational Description Three-step procedure is required...
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ee4215_c3 - Preventive Security Approaches Content Two main...

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