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Mobile edge caching is a promising technology for next-generation mobile networks to effectively offer service environments and cloud-storage capabilities at the edge of networks. By exploiting the storage and computing resources at the network edge, mobile edge caching can significantly reduce service latency, decrease network load, and improve the user experience. On the other hand, edge caching is subject to a number of threats regarding privacy violations and security breaches. In this article, we first introduce the architecture of mobile edge caching, and address the key problems regarding why, where, what, and how to cache. Then we examine the potential cyber threats, including cache poisoning attacks, cache pollution attacks, cache side-channel attacks, and cache deception attacks, which result in huge concerns about privacy, security, and trust in content placement, content delivery, and content …