Fast, affordable and convienient: Messaging services are enjoying incredible popularity worldwide. In Europe, WhatsApp is especially successful, whereas WeChat from China and Line from Japan are widespread in Asian regions. Despite the popularity of such apps, a debate has sprung up about data security on these services. Experts have been criticizing the inadequate encryption on many services, including WhatsApp. After it was sold to Facebook, user numbers for other messaging services rose. According to current test results, Swiss app Threema is considered the safest alternative.