1. Information System Security Engineering and Management Additional slides for INFORMATION SECURITY RISK MANAGEMENT Dr. William Hery hery@isis.poly.edu

2. Two Clarifications From Last Week Since we are only looking at IT security, for our purposes an asset is at risk because some IT asset is at risk. An IT asset may be information, a process run on the IT system, or a piece of IT equipment. The corresponding “real world” asset is used to put a value on the IT asset. These added slides will relate the IT asset to the “real world” assets discussed in the POSA example last week. Examples should have been included of the risks as  asset, threat, vulnerability combinations

3. POSA Functional Diagram POSA CFAC USER 1 Sale information 7 Complete Trans. Register 5 Y/N 4 Sale & user information 8 Complete transaction 3 User CC information 6 Y/N 2 Display Sale Info

4. Store Assets at Risk Value of purchase (for incorrect approval)  IT asset: the approval process integrity, customer credit card data confidentiality Loss of purchase profit (for incorrect denial, POSA unavailability)  IT assets: the approval process integrity, system availability Loss of customer good will (for incorrect denial, unavailability)  IT assets: the approval process integrity, system availability Store ability to process sales (if CFAC is taken down by an attack through POSA)  IT assets: system availability Corporate reputation (for repeated problems, publicized problems)  IT asset: system availability, the approval process integrity, customer credit card data confidentiality …

5. Credit Card Holder Assets at Risk Credit card number/pin  Time, ability to purchase (for incorrect denial, unavailability due to cancelled card)  $50 (for incorrect approval on a lost/stolen card used by someone else)  $50 (for use of a credit card number stolen through the system)  Time cost to correct problem & possible temporary loss of credit (for use of a credit card number stolen through the system)  Temporary use of checking account (for use of a debit card number/pin stolen through the system)  IT Asset: approval system integrity, card number/pin confidentiality …

6. Credit Card Company Assets at Risk Credit card number/pin  Amount of purchase (for incorrect approval)  IT Asset: customer credit card data confidentiality …

7. Sample POSA Risks Confidentiality of customer information  read by insiders using internal network vulnerabilities  read by insiders using POSA terminal vulnerabilities  read by insiders using POSA-register link vulnerabilities  read by hackers using vulnerabilities on Internet connections Integrity of verification process, modified by  insiders using internal network vulnerabilities  insiders using POSA-register link vulnerabilities  modified by insiders using POSA terminal vulnerabilities  modified by insiders using vulnerabilities on Internet connections Availability of verification process, attacked by…...