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More and more classes of devices become capable of connecting to the Internet. Due to the observation that a point-to-point communication is insufficient for many non-interactive application integration scenarios we assume the existence of a logically centralized message warehousing service, which clients can use to deposit and retrieve messages. The particular challenge in this context is that a client depositing messages can only describe eligible receiving clients using their characterizing attributes and does not know their specific identities. The depositing client still wants to prevent exposure of the message content to the message warehousing service. We explore how this many-to-many integration between devices and enterprise systems can achieve end-to-end information confidentiality using a solution based on Identity-Based Encryption.