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How to think like a hacker - Scott Culp's 10 Immutable Laws of Security

Back in the year 2000 Scott Culp published a paper outlining the 10 Immutable Laws of Security. I've restated them here to be concise but strongly encourage you to read the original article as it develops each law to discuss each in turn.

If you're new to information security and would like to put everything in context then Scott's paper will help. In addition remember that information security is all about risk measurement, mitigation together with policy, process and people - security policy must support the requirements of the business whilst mitigating the risks to a level that the company are comfortable with.

Policy and processes must be constantly reviewed and updated to ensure compliance with the requirements and operation of the business. People outside the security team must be involved with and buy into the security of information otherwise they are likely to take shortcuts.

Security Policy must be realistic - users can be encouraged to comply with reasonable security policy and associated guidelines - if they think "the policy's stupid" then they are far less likely to follow it. Security policies must "have teeth" to make it clear to users that failure to comply will result in consequences.

Here are the 10 Immutable Laws of Security:

Law #1: If a bad guy can persuade you to run his program on your computer, it's not your computer anymore
Law #2: If a bad guy can alter the operating system on your computer, it's not your computer anymore Law #2: If a bad guy can alter the operating system on your computer, it's not your computer anymore
Law #3: If a bad guy has unrestricted physical access to your computer, it's not your computer anymore Law #3: If a bad guy has unrestricted physical access to your computer, it's not your computer anymore
Law #4: If you allow a bad guy to upload programs to your website, it's not your website any more Law #4: If you allow a bad guy to upload programs to your website, it's not your website any more
Law #5: Weak passwords trump strong security Law #5: Weak passwords trump strong security
Law #6: A computer is only as secure as the administrator is trustworthy Law #6: A computer is only as secure as the administrator is trustworthy
Law #7: Encrypted data is only as secure as the decryption key Law #7: Encrypted data is only as secure as the decryption key
Law #8: An out of date virus scanner is only marginally better than no virus scanner at all Law #8: An out of date virus scanner is only marginally better than no virus scanner at all
Law #9: Absolute anonymity isn't practical, in real life or on the Web Law #9: Absolute anonymity isn't practical, in real life or on the Web
Law #10: Technology is not a panacea Law #10: Technology is not a panacea

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