Unencrypted vs encrypted password

0 specifies a password UNENCRYPTED will follow
7 specifies a HIDDEN password will follow
LINE the UNENCRYPTED (clear) user password

What do these options mean?

When you enter a password or a key for something without putting a 0 or 7 in front of the value am I actually enter as unencyrpted or gross?  The 7 is used only when copying to a different config?  Can you copy the line with the hash in it from the config on one switch/router to another and make it work for what you are configuring?  I don't understand why you would use these rather than the plain text values in the issuance of an order.

Also.  I entered a password for a local user while the service password encryption has been disabled.  When I did a show run it displays the password in plain text.  However, when I didn't do a no service password-encryption and run the password of another show still encrypted with the hash.  Why is this?

First and most important: the type 7 passwords you get with "service-encryption" are not hashed. They are just 'hidden' and can easily be reversed. They only protect against someone looking over your shoulder, but not enough to protect passwords when the configuration file is communicated to the public.

Normally, the new passwords are always entered in clear text:

 inet(config)#enable password ThisIsSuperSecret

If you "service password encryption" enabled, the router calculates the type 7 password and entering the password in the config:

 inet(config)#do sh run | i password service password-encryption enable password 7 053F0E0632655D3A0C151200380907382E30

This line can now be copied to another machine and will be recognized as password.

Turning off encryption service is not turning back the password, but all the newly entered password will be displayed as plain text.

The type 7 passwords can be cancelled in clear text with tools found on the internet. I use python for this script:

 kiMaMi:~ karsten$ ./cipade.py 053F0E0632655D3A0C151200380907382E30 ThisIsSuperSecret kiMaMi:~ karsten$ 

Today, it is a general notice do not to use all the functions of "password".

Use "enable secret" instead of "enable password" and "username NAME secret" instead of 'user name and password NAME' as these passwords are really only hashes and cannot be restored:

 inet(config)#username TEST secret NotSoSecurePassword inet(config)#do sh run | i TEST object-group service TEST username TEST secret 5 $1$UkL8$O2H1/rz7CzmCu0vfCiNdK. 

Here, a md5 hash is used which is not at all more advanced. If you have a newer IOS, you can use the more secure PBKDF2:

 inet-home(config)#username TEST algorithm-type sha256 secret THISisNotSecureEnough inet-home(config)#do sh run | i TEST username TEST secret 8 $8$ucEtAF7OpgRpVU$CPP9//P40ibq0LEORAha6S6S6gDF4bVtUiz8VGHcz1U 

Tags: Cisco Network

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