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Authentication
- Something you know. Pwd/Login
- Something you have. Physical Key or RSA tag
- Something you are. DNA, fingerprint
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Prevention was equated to...
protection
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DAC
- Discretionary Access Control: Means of restricting access to objects based on the indentity of subjects and/or groups to which they belong
- -owner of a file can specify what permissions members in the same group can have & also what permissions all others can have
- - ACLs are common mechanisms used to implement DAC
- "At the users discretion"
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MAC in regards to ACL
- Mandatory Access Control: means of restricting access based on sensitivity(as represented by labels) of the info contained in the objects & the formal authoriazation of subjects to access info of such sensitivity.
- -e.g. Secret, Top Secret
- "Multilevel Security"
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RBAC - Role
Role Based AC: Based on the user's ROLE. Permissions are granted based on terms of specific duties they must perform - not according to a security classification associated with individual objects
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RBAC - Rule
- Rule Based AC: Uses ACLs to determine whether access should be granted by a series of RULES.
- -e.g. No employee may access payroll files on weekends
- -can be used in additionto MAC & others
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Hardening of the OS
- Methods used to strengthen OS & to eliminate possible avenues through which attacks can be launched.
- -e.g. Windows Updates
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Anti Virus
Program designed to prevent damage caused by various types of malicious software
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Host - Based IDS
Host-Based Intrusion Detection Systems: Devices designed to determine whether an intruder has penetrated a computer system or network.
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Authentication: The "A" of CIA-AN
An individual is who they claim to be. Expanded in Chap 1
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Availability- The "A" of CIA-AN
To ensure that the data, or system itself, is available for use when the authenticated user wants it.
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Integrity- The "I" of CIA-AN
- Related to Confidentiality- modification of data.
- -Only authenticated individuals should be able to change or delete info
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Confidentiality: "C" of CIA-AN
Confidentiality: Ensures that only those indviduals who have the authority to view a piece of info may do so.
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CIA of Security - CIA-AN
- Original CIA
- Confidentiality
- Integrity
- Availability
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- AN: Added due to communication such as email
- Authentication
- Non-Repudiation
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Control Mechanisms
- DAC : Discretionary Access Control(AC)
- MAC : Mandatory AC
- RBAC : Role-Based AC
- RBAC : Rule-Based AC
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Job Rotation
By rotating through jobs, individuals gain a better perspective of how the various parts of IT can enhance (or hinder) business.
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Operational Model of Security
- Protection = Prevention + (Detection + Response)
- Protection = P + (D + R)
Every security technique & technology falls into @ least one of the three elements of the equation.
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Prevention
- Access Controls
- Firewalls
- Encryption
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Host Security
- Focus on protecting each computer and device individually
- - Bastion Hosts
- - Host-Based IDS
- - Anti-Virus
- - Hardening of the OS
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Network Security
- Emphasis is placed on controlling access to internal computers from external entities.
- -Routers, firewalls, authentication hardware & software, encryption & IDS
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Least Privilege
- Most fundamental approach to security
- An object (user, app, or process) should have only the rights & privileges necessary to perform its task, with no additional permissions
- -first step is to create a security baseline
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Separation of Duties
- Separation of Duties:
- Ensures that for any given task, more than one indvidual needs to be involved
- No single individual can abuse the system for his or her own gain
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Implicit Deny
- If a particular situation is not covered by any other rules access should NOT be granted.
- Applies to both access & authorization
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Non-Repudiation: "N" of CIA-AN
Ability to verify that a message has been sent and received so that the sender/receiver can't refute(or repudiate) sending/receiving the info.
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