If the boot image does not support enable secret, note the following caveats: Look at your boot image using the show version command from your normal operating mode (Full Cisco IOS image) to see whether the boot image supports the enable secret command. Which Cisco IOS Image Supports enable secret? Indeed, the strength of the encryption used is the only significant difference between the two commands. Note: This applies only to passwords set with enable secret, and not to passwords set with enable password. As far as anyone at Cisco knows, it is impossible to recover an enable secret based on the contents of a configuration file (other than by obvious dictionary attacks).
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The only instance in which the enable password command might be tested is when the device is running in a boot mode that does not support the enable secret command.Įnable secrets are hashed using the MD5 algorithm. Use the enable secret command for better security.
The enable password command should no longer be used. It was never intended to protect against someone conducting a password-cracking effort on the configuration file.īecause of the weak encryption algorithm, it has always been Cisco's position that customers should treat any configuration file containing passwords as sensitive information, the same way they would treat a cleartext list of passwords. The encryption scheme was designed to avoid password theft via simple snooping or sniffing. The scheme used by Cisco IOS for user passwords was never intended to resist a determined, intelligent attack. We would expect any amateur cryptographer to be able to create a new program with little effort. User passwords and most other passwords ( not enable secrets) in Cisco IOS configuration files are encrypted using a scheme that is very weak by modern cryptographic standards.Īlthough Cisco does not distribute a decryption program, at least two different decryption programs for Cisco IOS passwords are available to the public on the Internet the first public release of such a program of which Cisco is aware was in early 1995. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions.
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This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. AAA can use local, RADIUS, and TACACS+ databases. Note: Cisco recommends that all Cisco IOS devices implement the authentication, authorization, and accounting (AAA) security model. This document explains the security model behind Cisco password encryption, and the security limitations of that encryption. The unexpected concern that this program has caused among Cisco customers has led us to suspect that many customers are relying on Cisco password encryption for more security than it was designed to provide.
The program will not decrypt passwords set with the enable secret command. A non-Cisco source has released a program to decrypt user passwords (and other passwords) in Cisco configuration files.
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