You do not need SAT keys to use and sign in Firmamex.

If you have your SAT e.signature .KEY and .CER files, register.

If you don’t have them, Firmamex helps you to generate your key pair – on your computer – associated to your email address, or associated to your cell phone number.

Select the PDF file you wish to sign or open the link to an invitation to sign that you received.

Sign where you want or, if the document contains a sticker for you, sign where indicated. Anyone, anywhere in the world, will be able to authenticate your signature, independent of Firmamex, with Adobe Reader, PDF Tools, Foxit, iText, Nitro Pro, etc.

Digital signatures in Firmamex, meet the legal definition of Advanced Electronic Signature. The means of identity used – SAT, mail-linked, or cellular-linked – depends on the circumstances of the case, and the level of risk you face.

Documents can be validated worldwide using standard PDF software, such as Foxit, Acrobat Reader, PDF Tools, iText, Nitro Pro, etc.