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docs: update privacy policy (#3796)

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Evgeny Poberezkin
2024-02-24 21:28:18 +00:00
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@@ -143,6 +143,12 @@ SimpleX Clients also form a network using SMP relays and IP or some other overla
[Wikipedia](https://en.wikipedia.org/wiki/Overlay_network)
# Non-repudiation
The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to [repudiation](#repudiation). While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.
[Wikipedia](https://en.wikipedia.org/wiki/Non-repudiation)
## Pairwise pseudonymous identifier
Generalizing [the definition](https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier) from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.
@@ -185,6 +191,12 @@ Network topology of the communication system when peers communicate via proxies
[Post-compromise security](#post-compromise-security).
## Repudiation
The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.
See also [non-repudiation](#non-repudiation).
## User identity
In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see [this comparison](https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols).