Editing Encyclopedia:Signatures (section)

=== Signature forgery ===
{{policy section|WP:SIGFORGE}}
{{strong|Never use another editor's signature.}} Impersonating another editor by using their username or signature is forbidden. Altering the markup code of your signature to make it look substantially like another user's signature may also be considered a form of impersonation. Editing the code of your signature to link it to another editor's user page is not permitted. It is also ineffective, as the change log of the page records the IP address and (if applicable) username of all editors; as such, any impersonators can easily be caught if the signature in the ''diff'' view differs from the editor's default signature. While not an absolute requirement, it is common practice for a signature to resemble to some degree the username it represents.

If you encounter a user whose signature is disruptive or appears to be impersonating another account, it is appropriate to ask that user to consider changing their signature to meet the requirements of this policy. When making such a request, always be polite, and [[WP:Good faith|assume good faith]]; do not immediately assume that the user has intentionally selected a disruptive or inappropriate signature. If {{em|you}} are asked to change your signature, please avoid interpreting a polite request as an attack. Since the success of Wikipedia is based on effective teamwork, both parties should work together to find a mutually acceptable solution.