Because they cannot be reversed, you only have two options if you've lost the password: Cracking (Brute Force/Dictionary Attack): You can use tools like John the Ripper to perform a brute-force attack
Changing the (usually to 0x2142 ) to ignore the startup configuration.
username admin secret 5 $1$nTc1$ZV9JZ.5X5p3L.9wL6wZ3e/
The fluorescent lights of the data center hummed, a low-frequency buzz that matched the headache throbbing behind Elias’s eyes. He was a senior network consultant, brought in to untangle a mess of legacy equipment left behind by a sysadmin who had departed on very bad terms.
"A classic human flaw," Elias said, copying the password. "He used the company name and his sentiment. It’s memorable for him, but it follows a pattern my software can predict."
If you’ve ever looked at a Cisco router configuration, you’ve likely seen a line starting with enable secret 5 . This "Type 5" designation indicates that the password is obfuscated using a hashing algorithm, specifically .
Decrypting a "Type 5" Cisco password is a common point of confusion for network administrators. Unlike passwords, which are weakly encrypted and easily reversed, Type 5 passwords are not encrypted at all—they are hashed.
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