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I can't say for sure. &nbsp;But have you tried:<br />
<br />
Turn on service password-encryption. &nbsp;Turn off service password-encryption. &nbsp;Reconfigure your other passwords but leave that one alone.
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Also you might try to use levels. I have never applied it as you require but you can give it a try.<br />
Router(config)# <b>privilege mode level level<br />
command-string</b><br />
Configures the specified privilege level to allow<br />
access to the specified command.<br />
Step 2 Router(config)# <b>enable secret level level {0 |5}<br />
password-string</b><br />
Sets the password for the specified privilege level.<br />
This is the password users will enter after entering the<br />
enable level command to access the specified level.<br />
• <b>0 indicates an unencrypted password string</b><br />
follows; 5 indicates an encrypted password string<br />
follows.<br />
<br />
More <a href="https://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfpass.pdf" rel="ugc">here</a>.
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I'm not altogether sure you can? just use AAA then theres no passwords there at all.
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I believe that once password encryption is turned off, that the passwords retain the encrypted information. &nbsp;So the author should be able to turn it on, turn it off, and reset the other passwords.
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Use secret vs service password encryption, if you just google crack Cisco password encryption there are a ton of sites out there that you can decrypt a level 7 password encryption.
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Or make sure you use password-encryption aes
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<div class="content wysiwyg-content">
From my understanding &quot;service password-encryption&quot; &nbsp;command encrypts all the password on the running config. &nbsp;<br />
<br />
How do you encrypt just the line con 0 password &nbsp;?
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From my understanding "service password-encryption"  command encrypts all the password on the running config.  

How do you encrypt just the line con 0 password  ?

Cisco: how to encrypt line console password only?

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

Cisco

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.