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Clarify hashtag privacy and group sender identity

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DG1TAL
2026-07-27 20:07:08 +02:00
parent a3a1aa5e3b
commit 84ceabfd0d
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docs/companion_protocol.md
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- Uses a secret key derived from the channel name - Uses a secret key derived from the channel name
- It is the first 16 bytes of `sha256("#test")` - It is the first 16 bytes of `sha256("#test")`
- For example hashtag channel `#test` has the key: `9cd8fcf22a47333b591d96a2b848b73f` - For example hashtag channel `#test` has the key: `9cd8fcf22a47333b591d96a2b848b73f`
- Traffic is encrypted on air, but anyone who knows or guesses the channel
name can derive the key. Hashtag channels should not be treated as private.
- Used as a topic based public group chat, separate from the default public channel - Used as a topic based public group chat, separate from the default public channel
3. **Private Channels** 3. **Private Channels**
- Uses a randomly generated 16-byte secret key - Uses a randomly generated 16-byte secret key
docs/payloads.md
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@@ -236,6 +236,9 @@ txt_type
The plaintext contained in the ciphertext matches the format described in [plain text message](#plain-text-message). Specifically, it consists of a four byte timestamp, a flags byte, and the message. The flags byte will generally be `0x00` because it is a "plain text message". The message will be of the form `<sender name>: <message body>` (eg., `user123: I'm on my way`). The plaintext contained in the ciphertext matches the format described in [plain text message](#plain-text-message). Specifically, it consists of a four byte timestamp, a flags byte, and the message. The flags byte will generally be `0x00` because it is a "plain text message". The message will be of the form `<sender name>: <message body>` (eg., `user123: I'm on my way`).
The sender name is unverified message text. Group messages contain no sender
signature, so any channel-key holder can choose any sender name.
# Group datagram # Group datagram
| Field | Size (bytes) | Description | | Field | Size (bytes) | Description |