12-23-2005 11:49 PM - edited 03-03-2019 01:14 AM
12-24-2005 03:27 AM
Hello,
the process is not reversible. In your case, somebody has entered the command ´service password-encryption´, after which the passwords were encrypted. After that, ´no service password-encryption´ has been entered, but this affects only newly configured passwords, not existing ones. The existing ones will remain encrypted...
Does that make sense ?
Regards,
GP
12-24-2005 12:52 AM
Hello,
let´s say you enter the following to your router configuration:
Router#conf t
Router(config)#username xxxx password xxxx
Router(config)#line vty 0 4
Router(config-line)#password xxxx
The configuration that would be visible to anybody with access to your router would be:
Router
!
username xxx password xxx
!
line vty 0 4
password xxxx
login
That means that anybody could see the passwords, which is a otential security risk. Now, after entering ´service password-encryption´, the configuration would look like this:
Router
!
username xxx password xxxxx
!
line vty 0 4
password xxx
login
As you can see, now the passwords are encrypted. Be aware though that these passwords are fairly easy to decrypt, there are numerous tools available on the Internet which let you decrypt them, such as this:
Cisco weak password decryption applet
http://users.skynet.be/glu/ciscopw.htm
HTH,
GP
12-24-2005 02:22 AM
Thanks for your reply. but please see the following "show run" output in my Cisco CatOS 3550 switch:
no service password-encryption
.
.
.
.
.
.
.
line con 0
line vty 0 4
password 7 0832455A0C4B50434v5D5F52
line vty 5 15
12-24-2005 03:27 AM
Hello,
the process is not reversible. In your case, somebody has entered the command ´service password-encryption´, after which the passwords were encrypted. After that, ´no service password-encryption´ has been entered, but this affects only newly configured passwords, not existing ones. The existing ones will remain encrypted...
Does that make sense ?
Regards,
GP
12-25-2005 08:12 PM
Ok, thanks.
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