| Aspect | Evaluation | |--------|-------------| | | Unlike Type 7, Type 5 is a true hash – cannot be decrypted to plaintext, only cracked offline. | | Salt included | Each hash has a unique salt (e.g., 8ZxUc ), preventing rainbow table precomputation for your specific hashes. | | Industry standard (legacy) | Widely supported, no external tools needed on Cisco devices. | | Better than Type 7 | Type 7 is reversible (weak obfuscation). Type 5 is a major security upgrade. |
The vulnerability of Type 5 lies not in the reversal of the algorithm, but in its speed and age. MD5 was designed for data integrity and speed in the 1990s, not for modern password security. Modern Graphics Processing Units (GPUs) and specialized cracking hardware can compute billions of MD5 hashes per second. If an administrator uses a weak or common password, a cracking tool can guess it in seconds. If the password is complex and long, the time required to guess it becomes computationally infeasible. Thus, Type 5 security relies entirely on the strength of the password, not the strength of the algorithm itself. cisco password decrypt type 5