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.
A Type 5 hash of an 8-character complex password (upper, lower, digit, symbol) has ~6 quadrillion combinations. At 60 GH/s, an attacker would need ~28 hours to exhaust the full keyspace. But with targeted wordlist attacks, that drops to . "But It's a Hash, Not an Encryption!" This is the common retort. "You can't decrypt a hash." True. But the industry has moved past pedantry. When we say "decrypt Type 5," we mean recover the plaintext password through efficient precomputation or brute force. cisco password 5 decrypt
And for a while, it worked. In 2005, a standard CPU might attempt 5-10 million MD5 hashes per second. A reasonably strong 8-character password could take weeks or months to crack. But in the world of modern password cracking,
By: Network Security Desk