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Investigative journalists gather and produce a great deal of information during their research, most of which is stored on mobile or computer devices. When handling digital data, it is necessary to be aware of how to protect information and fend off security threats. One main concern during an investigation should be to ensure communication with sources is safe at all times. This chapter will discuss digital security threats and introduce various software and tools to support a secure working environment. It focuses on common computer systems (Mac, Windows) and smartphones (Android, iOS).