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Body Area Networks (BANs) are composed of multiple devices that measure, collect, forward and analyze physiological and medical data that may be used for different purposes like activity tracking, health monitoring or medical treatments. Given the type of data BANs manage, several security requirements must be addressed: confidentiality, integrity, privacy, authentication and authorization. This survey studies various proposals that aim to satisfy BAN security requirements, their advances and remaining challenges. We found that the mentioned requirements have not been comprehensively considered; the majority of the studied proposals do not address the entire BAN architecture, they focus on specific components. Although supporting security of individual BAN components is relevant, a comprehensive security view of an entire BAN environment is needed.