Abstract This paper deals with the development of text messages protection from unauthorized access and malicious software. The structure of an attacker model and main security threats are provided. The article tells about the requirements for protective systems of this kind, examines the main information security threats. The tools of system development such as protecting messages using the RSA algorithm, using ELGamal algorithm and using an algorithm based on elliptic curves are described. The performance results and effectiveness of the proposed ideas are provided. The implementation can be performed directly on mobile subscribers in the form of a software product, or as additional functional software of a virtual operator. The proposed protection system can significantly enhance security of mobile communication.