Encrypt username

Question

How do I go about encrypting "username" so that it is not saved in plain text format in database. I was looking for a module that does this, but couldn't find one.

Would adding logic (hook_user_presave() and hook_user_load()) as described in How can you encrypt the username and email address in the database, to protect against emails being stolen from a compromised database (D7) be sufficient? The accepted answer says:

This is just my point of view, but if you want do it what you can use this module http://drupal.org/project/aes and with some user hooks, such as hook_user_presave() and hook_user_load().

Answer 1

I think it may be easier to store an arbitrary string or number (maybe the UID) as the username, and then store the actual (encrypted) username in a custom field.

This would mean writing a custom login script that uses your custom table, however it means you won't have to start changing stuff in the users module.