You need to have your signature, or the seal and official signatures of an authority on a document, authenticated (legalised).
In accordance with the Ordinance on the Swiss Persons and Institutions Abroad, the Swiss representations abroad are among others authorized to legalise the seal and official signatures of the receiving state as well as the signatures of private persons.
Legalisation involves a written declaration by the person carrying out the legalisation (judicial or administrative authority, notary public) attesting to the authenticity of an official signature or seal on a public document, or of a private signature, so that the signature and/or seal will be accepted whenever the document is produced. The public official certifies only the authenticity of the signature and does not accept any responsibility as to the validity of the document or its content.