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@ -6,7 +6,7 @@ More private 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.
This NIP defines a way for two clients to derive and share `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. Privacy wise this is far from ideal.
@ -16,7 +16,7 @@ This NIP describes a way to obfuscate DM communications from the "general public
## 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 parent key` from which it will derive keys to send and keys to receive (listen for) `kind:4` events
- build a `direct-message parent key` from which it will derive `keys-to-send` and `keys-to-receive` (listen for) `kind:4` events
- share this `direct-message parent key` with its DM peer
Each client has a `master` key (denoted with `m`). This key can be the profile `nsec...`, but it is not mandatory.
@ -45,44 +45,57 @@ If Alice wants to build he <code>dm parent key</code> for Bob then she has to:
</ul>
</details>
We notate the above derived `direct-message public key` with `dmpk`. Then we can define paths of the form `dmpk/<action>/index`.
We notate the above derived `direct-message parent key` with `dmpk`. Then we can define paths of the form `dmpk/<action>/index`.
| Action Name | Value | Path | Derive keys for |
|-----------------------|--------|---------------------|-----------------------------------|
| **send** | `0` | `dmpk/0/<index>` | sending `direct messages` |
| **receive** | `1` | `dmpk/1/<index>` | receiving `direct messages` |
| `draft`: republish | `2` | `dmpk/2/<index>` | sending `republish events` |
| **init** | `0` | `dmpk/0/0` | initialize the `direct messages` flow|
| **send** | `0` | `dmpk/1/<index>` | sending `direct messages` |
| **receive** | `1` | `dmpk/2/<index>` | receiving `direct messages` |
| `draft`: republish | `2` | `dmpk/3/<index>` | sending `republish events` |
| `draft`: market-order | `4500` | `dmpk/4500/<index>` | sending NIP45 `market orders` |
The client (creator of the `dmpk`) must:
- use a new send key (`dmpk/0/<index>`) for each event it signs. It starts from `0` and increments after an event is signed.
- create filters for the public keys it expects to receive messages to (`dmpk/1/<index>`). It is recommended to listen for the next `10` keys and increment the index once a key is used (see [BIP-44 address gap logic](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#user-content-Address_gap_limit)).
- use a new send key (`dmpk/1/<index>`) for each event it signs. It starts from `0` and increments after an event is signed.
- create filters for the public keys it expects to receive messages to (`dmpk/2/<index>`). It is recommended to listen for the next `10` keys and increment the index once a key is used (see [BIP-44 address gap logic](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#user-content-Address_gap_limit)).
## Exchange the `direct-message parent key`
If `Alice` wants to signal `Bob` that she is ready to use this NIP (for more privacy) she must:
- build a JSON data of the form:
```json
{
"key": <the direct-message parent key (dmpk)>,
"pubkey": <32-bytes lowercase hex-encoded public key of Alice (public profile key)>
"dmpk": <32-bytes lowercase hex-encoded direct-message parent key>,
"shared_secret_hash": <32-bytes lowercase hex-encoded sha256 of the shared secret>
"send_index": <integer (optional), the index of the last key used to sign an event>,
"receive_index": <integer (optional), the index of the last key an event was received to>,
}
```
> **Note** `send_index` and `receive_index` are optional, but they help the client a lot in knowing what the state is. Alternatively (when an account is retored) the client would have to scan the public keys until unused ones are found (similar to [BIP-44 address gap logic](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#user-content-Address_gap_limit)).
> **Note** `send_index` and `receive_index` are optional, but they help the client a lot in knowing what the state is. Otherwise (when an account is retored) the client would have to scan the public keys until unused ones are found (similar to [BIP-44 address gap logic](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki#user-content-Address_gap_limit)).
- publish a `Parameterized Replaceable Event` ([NIP-33](https://github.com/nostr-protocol/nips/blob/master/33.md)) having:
- publish a `Parameterized Replaceable Event` ([NIP-33](https://github.com/nostr-protocol/nips/blob/master/33.md)) of the form:
```json
{
...
"pubkey": <32-bytes lowercase hex-encoded "init" public key derived using `dmpk/0/0`>,
"kind": 35709,
"content": <NIP-04 encrypted content of the JSON data>,
"tags:" [
"d": <sha256 of the shared secret as defined in NIP-04>
"d": <32-bytes lowercase hex-encoded public key of Bob>,
"p": <32-bytes lowercase hex-encoded public key of Bob>
]
}
```
> **Note** the reason for using `sha256(shared_secret)` for the `d` tag is so that outside observers do not even know that `Alice` and `Bob` have started to communicate. Any other value for the `d` tag would reveal that the message is intended for `Bob`.
If `Bob` supports this NIP then he must:
- subscribe to events for him:
```json
{
"kind": 35709,
"#p": [<32-bytes lowercase hex-encoded public key of Bob>]
}
```
- descrypt the content,
After both `Alice` and `Bob` have published the `kind: 35709` event, they can start to publish and listen to events using the `one-use-only` keys.