This article describes the use of facial biometric features in implementing the security of digital messaging using RSA cryptosystems. Various studies have been conducted related to the security of secret messages one of which is RSA. The main focus on the RSA algorithm is the selection of public keys and private keys. Public key generation techniques as well as private keys can use simple random generation or other techniques such as using user biometrics like faces and other features. Cryptosystems that use facial biometrics require the identification process of the user face user involved, there are several techniques in recognizing the face one of them is to use back propagation algorithm because it is considered as a very stable algorithm in pattern recognition process but requires good preprocessing to be recognized by back propagation, prepossessing done with several stages of image processing that is gray scaling, then filtered with median, Otsu and split into grid to be input value to back propagation. By using face biometrics this app is capable of displaying messages according to user rights.