But in the world of modern password cracking, a one-way street often has a very fast exit ramp. In the late 1990s, Cisco introduced Type 5 (often called "secret") to replace the embarrassingly weak Type 7 (Vigenère cipher). Type 7 passwords can be decrypted instantly with a simple tool. Type 5 was different. It used MD5 + a 4-byte salt. The goal? Make offline brute-force attacks slow enough to be impractical.
By: Network Security Desk
For decades, network engineers have labored under a quiet assumption: if a Cisco device configuration shows a line like enable secret 5 $1$mERr$hLyHcj1oJjp7xR1EaE.CV. , the password is safe. After all, Type 5 hashes aren't reversible like Type 7 passwords. They are salted, MD5-based hashes. They are, by design, meant to be a one-way street.
But in the world of modern password cracking, a one-way street often has a very fast exit ramp. In the late 1990s, Cisco introduced Type 5 (often called "secret") to replace the embarrassingly weak Type 7 (Vigenère cipher). Type 7 passwords can be decrypted instantly with a simple tool. Type 5 was different. It used MD5 + a 4-byte salt. The goal? Make offline brute-force attacks slow enough to be impractical.
By: Network Security Desk
For decades, network engineers have labored under a quiet assumption: if a Cisco device configuration shows a line like enable secret 5 $1$mERr$hLyHcj1oJjp7xR1EaE.CV. , the password is safe. After all, Type 5 hashes aren't reversible like Type 7 passwords. They are salted, MD5-based hashes. They are, by design, meant to be a one-way street. cisco password 5 decrypt