Abstract: Chimaera is a model intended to secure data (messages) exchanges between applications. Chimaera uses the PEM (Privacy Enhanced Mail) format which enables the receiver to authentificate the sender identity using special informations (certificates, signature, hash-coding) held into the message. PEM is a model for e-mail authentification and certification. PEM complies to X509 standard as for the handling of certificates. Chimaera provides a way to generate PEM formatted mails. Such mails will be fully read by users running a similar PEM application, not necessarily Chimaera. Basic Chimaera services are: The certification of public keys of individuals thru submission to the local certification authority.