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Using a list of common passwords (wordlist) and trying each one to see if it matches the hashed password. Tools like Aircrack-ng or John the Ripper support wordlist attacks.
# Generate a Cisco Type 5 hash for testing (on Linux with mkpasswd) mkpasswd -m md5 -S cisco mysecretpass # Output: $1$cisco$Tm3fH4jK9lQ8xP2mN7bR/. cisco secret 5 password decrypt
Given the rise of GPU-based cracking (a single high-end GPU can test millions of MD5 hashes per second), Type 5 is no longer advisable for new deployments. Using a list of common passwords (wordlist) and
# Mock "decrypt" demo print("\n--- Mock Decryptor (Rainbow Table Demo) ---") mock = CiscoSecret5Decryptor() mock_result = mock.decrypt(args.hash) print(f"Decrypt attempt: mock_result") Given the rise of GPU-based cracking (a single
has been the standard for over two decades. It uses MD5 with a salt and 1000 iterations of the hash function. Iterations make brute-force slower, but MD5 is no longer considered secure for high-stakes environments.
Every Type 5 hash includes a random 32-bit (4-character) salt. This ensures that even if two users have the same password, their stored hashes will look entirely different, effectively neutralizing rainbow tables. Iteration: The algorithm runs MD5 over the result 1,000 times