The enable password command should no longer be used. Because of the weak encryption algorithm, it has always been Cisco's position that customers should treat any configuration file containing passwords as sensitive information, the same way they would treat a cleartext list of passwords. It was never intended to protect against someone conducting a password-cracking effort on the configuration file. The encryption scheme was designed to avoid password theft via simple snooping or sniffing. We would expect any amateur cryptographer to xisco able to create a new program with little effort. For more information on document conventions, refer to the. This document is not restricted to specific software typf hardware versions. There are no specific requirements for this document. This decrypt explains the security model behind Cisco password encryption, and the security limitations of that encryption. The unexpected concern that this program has caused among Cisco customers has led us to suspect that many customers are relying on Cisco password encryption for more security than it was designed to provide. The program type not decrypt passwords set with the enable secret command. While Cisco has provided a method to test devices for existence of these problematic passwords, you may still want a way to ensure that such passwords are not introduced anytime in the future.Ī non-Cisco source has released a program to decrypt cisco passwords and other passwords in Cisco configuration files. I have tried 3 different things for salts.įirewall.cx - A local user with access to a hashed Type 4 password can conduct a brute-force guessing attack. Use of this code for any malicious or illegal purposes is strictly prohibited! You know I mean the space of all possible passwords. Since hashes were weak, the information was more than enough to crack millions of hashes in hours if anyone gets their hands on hashes. I thought I had it but it still escapes me.

More Information On Cisco Passwords and Which can be Decoded Back in late 1995, a non-Cisco source had released a program that was able to decrypt user passwords and other type of passwords in Cisco configuration files.

Decrypt cisco secret 4