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14-WAKU2-MESSAGE: Adds security consideration about the timestamp field (#447) 

* adds the consideration about the timestamp

* minor rewording

* more explicit about enc and sign

* minor revision

* Update content/docs/rfcs/14/README.md

Co-authored-by: oskarth <ot@oskarthoren.com>

* Update content/docs/rfcs/14/README.md

Co-authored-by: oskarth <ot@oskarthoren.com>

* rephrases the CIA discussion

Co-authored-by: oskarth <ot@oskarthoren.com>
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Sanaz Taheri Boshrooyeh 2021-08-05 19:53:56 -07:00 committed by GitHub
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content/docs/rfcs/14/README.md
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@ -77,8 +77,20 @@ The previous `data` field corresponds to the `payload` field.
# Security Consideration
In Waku, the confidentiality, integrity, and authenticity of the data must be addressed at the `WakuMessage` level.
That is, the `payload` shall be encrypted or signed properly to meet the application-specific privacy needs.
## Confidentiality, integrity, and authenticity
It is up to the application layer as to what level confidentiality, integrity and authenticity of the `payload` of `WakuMessage` matters.
Accordingly, the application layer shall utilize the encryption and signature schemes supported in WAKU2 to meet the application-specific privacy needs.
The set of supported schemes in WAKU2 is presented in [WAKU2-PAYLOAD](/specs/26).
## Reliability of the WakuMessage timestamp
The `timestamp` field in `WakuMessage` is set by the sender.
Because `timestamp` isn't independently verified, this field is prone to exploit and misuse.
It should not solely be relied upon for operations such as message ordering.
For example, a malicious node can arbitrarily set the `timestamp` of a `WakuMessage` to a high value so that it always shows up as the most recent message in a chat application.
Applications using the `WakuMessage`'s `timestamp` field are recommended to use additional methods for more robust message ordering.
An example of how to deal with message ordering against adversarial message timestamps can be found in the Status protocol, see [6/PAYLOADS](https://specs.status.im/spec/6#clock-vs-timestamp-and-message-ordering).
# Copyright