According to § 33a of the German Social Security Code, Volume Five (SGB V, Sozialgesetzbuch (SGB) Fünftes Buch (V)), persons with statutory health insurance are under certain conditions entitled to be provided with so-called eHealth applications. These applications are designed to support the “detection, monitoring, treatment or alleviation of diseases or the detection, treatment, alleviation or compensation of injuries or disabilities” [SGB V section 33a]. This Technical Guideline is addressed to manufacturers of eHealth applications for mobile devices. Furthermore, it can be used as a guideline for mobile applications that process and store sensitive data.