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| Subject: | Re: Secure Password Policy? |
|---|---|
| Date: | Thu, 19 Jan 2006 19:35:57 +0200 (IST) |
On Thu, 19 Jan 2006, Sulaiman, Wilmar wrote:
I would like to know where they derived the number (6 and 8 characters).
The method is as follows: you define how long an attacker can try (T), how many attempts he can make per time unit (A) and what is the probability of breakin (P). If the whole keyspace is S then A*T/S = P and so S = A*T/P Next step is to determine how many bits of entropy (B) are in each character and the length of the password can be calculated: L = log(S)/B -- Regards, ASK ------------------------------------------------------------------------------ Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 -------------------------------------------------------------------------------
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