![]() # Credits for original code and description SPHiXe. Here is a small PERL program to decrypt Cisco type 7 passwords: #!/usr/bin/perl -w There are many programs that decrypt Cisco type 7 passwords. Cisco Type 7 passwordsĪ password in the configuration file with a ‘7’ in the second to last field is encrypted with Cisco’s weak proprietary algorithm. The second, type 5, uses strong MD5 encryption. The first, type 7, uses a Cisco proprietary weak encryption algorithm. Cisco Password EncryptionĬisco uses two encryption methods to secure IOS passwords. ![]() One server may have theĬonfiguration files for every Cisco device on the network. (Trivial File Transfer Protocol) servers. Network administrators often store IOS configuration files on T FTP ![]() ‘service password-encryption’ is enabled using the following command: ![]() Once there is access to the Cisco configuration file, the passwords can be decrypted fairly easily. If ‘service password-encryption’ is configured on the Cisco device, most of the passwords are encrypted with a weak encryption algorithm (Type 7) that is easy to decrypt. If ‘service password-encryption’ is not configured on the Cisco device, simply read the plain text passwords from the configuration file.
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