Renaming transit encryption key

I have created different transit encryption keys for each user on my site. The path I have followed is /myapp/transit/keys/[username]. All the user specific documents are encrypted/decrypted in this way with their own encryption key.

Now if the user have renamed its username, is it possible to rename the encryption key also or is there any other workaround to this scenario?

Got it… I have to use backup/restore.