panazen.blogg.se - Ipassword cost

Instead, I’ll present you with a few meaningful examples that illustrate how changes to these components affect the strength of the protection of your users' passwords. To show how the four components above relate to the initial questions asked by management, I won’t give a definition of these four components.

(Which equates to the minimum password complexity required.)

The minimum charset required to the users when selecting their passwords.

The hashing algorithm used to protect the password.

In summary, there are four key components that define the cost of cracking a password: A nation state attacker may have more resources available and be willing to devote more time to processing the password hashes. A script kiddie might dedicate a few hours to a few days to trying to get access to those passwords. Quick point – a reasonable amount of time changes based on the profile of your attacker. In other words: how, from a design perspective, can we make the cracking process more time intensive thus reducing the ability of an attacker trying to crack a specific set of password hashes in a reasonable amount of time. Under this scenario and putting aside the breach itself, the two immediate questions to answer to the management will be: “How were we protecting user’s passwords?” and “Would the intruder be able to impersonate our clients (obtain their corresponding plain text passwords)?” These questions are somewhat subjective and to properly answer these questions you need to understand the costs of password cracking, and what elements of your password policy affect those costs. Somehow, an intruder was able to evade all the security measures you had in place to breach your website database and was able to obtain all the usernames and password hashes related to your clients. Let’s assume for a moment that you suffered a security breach for a web application accessed by your customers. The exponential nature of password cracking costs The following is his analysis on the exponential nature of password cracking costs. Flavio De Cristofaro used to run our Security Consulting Services (SCS) group and long time password cracking enthusiast was recently asked to present at AppSecLatam2012 on Lessons learned from Recent Password Leaks.