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Is it possible to encrypt or make sure that the indexed IOTA messages are received/extracted only by receiver they are meant for. My user case: User A, B, and C each have IDs that are known to all users (A,B,C in this case). Now user A want to send a message to B, so A will use B's ID as an index and attach the message to the tangle. User B will be looking for messages on the tangle that have B's ID as index and will be able to extract it. How could I make sure that only user B is able to extract this indexed data (and not User C, if user C decide to look for the same index)? Are there any other IOTA options?

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You can add metadata to tx and store message.

But blocks containing tx or simply data are always public. So, to keep a message private you need to encrypt it using the public key of the user that you want to be the only one able to access (decrypt) the message.

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