If you’ve spent any time looking at a Cisco running-config, you’ve likely seen a line that looks like this: enable secret 5 $1$w1Jm$bCt7eJNv.CjWPwyfWcobP0
: Type 5 uses salted MD5 hashing. A hash is a one-way trip; you can go from "password" to "hash," but you can't mathematically turn "hash" back into "password".
are the current recommendations, offering modern key derivation functions. cisco secret 5 password decrypt
: The current gold standard, specifically designed to be extremely slow for hardware to brute-force.
If you have lost access to a device and need to find the password, professionals often use: If you’ve spent any time looking at a
: While mathematically irreversible, MD5 is now considered weak. Modern hardware (GPUs) can guess millions of passwords per second, making "brute-force" or "dictionary" attacks effective against simple passwords. Comparison of Cisco Password Types
However, you can the plaintext using:
A tool takes a guess (like "p@ssword123"), runs it through the same MD5 hashing algorithm, and compares the result to the hash in your config.