Password Cracking

1
Password Cracking

• With John the Ripper
• Fred Schank
• Kevin Wetter

2
Overview

• Password Cracking Basics
• Common Password Crackers
• Installing JTR
• Running JTR
• Customizing JTR

3
Password Cracking

• Used by hackers and sys. admins. Alike
• Hackers
• Gain unauthorized access
• System Admin.
• Test strength of user password(s)

4
Common Password Crackers

• Crack Crack 5
• Rainbow
• Cracker Jack
• John the Ripper (JTR)

5
Why JTR?

• Extensive documentation
• Easy Install
• Multi-platform functionality
• One of the more popular crackers

6
Installing JTR

• Download .tar file
• Extract/make source code
• cd ./src
• make generic
• Result 3 directories
• src
• run
• doc

7
Running JTR

• Open run directory
• gt ./john ltpasswd filegt

8
Customizing JTR