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NIP-704

Key derivation for Encrypted Direct Messages

draft optional author:motorina0

This NIP defines a way for two clients to derive one-use-only keys for sending and recieving kind:4 events.

Motivation

The content of Direct Messages (NIP-04)[https://github.com/nostr-protocol/nips/blob/master/04.md] is encrypted, but everyone can see who is chatting with whom. This is far from ideal from a privacy perspective.

Suggestion

For the maximum of privacy the two participants of a Direct Message exchange SHOULD use a different public key for each kind:4 event. This means that each participant has to:

  • build a direct message top key from which it will derive keys to send kind:4 events and keys where to recieve (listen for) kind:4 events
  • share this direct message top key with its DM peer