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remove more x4 cruft

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Oskar Thoren 2019-08-27 15:17:02 +02:00
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# Conversational Security Layer
Conversational Security Layer provides various cryptographic properties:
1. **Confidentiality** - Ensure only intended recipients are able to read a message.
2. **Integrity** - No honest party will accept a message modified in the transit.
3. **Authentication** - Each participant in the conversation receives a proof of possession of a known long-term secret from all other participants. In addition, each participant is able to verify that a message was sent from the claimed source.
This assumes trust has already been established, see [Initial Trust Establishment Specification](x5.md).
4. **Forward secrecy** - Also known as perfect forward secrecy (PFS), gives assurance that session keys will not be compromised even if the private key is compromised. Also, compromising one session key will not result in compromising other sessions.
Please refer to [Initial Conversational Security Specification](x6.md) for more details.
# Transport privacy layer
The purpose of the transport privacy layer is to hide metadata (provide darkness) that are always sent when communicating over the internet. In some cases, leaked metadata might be as dangerous as leaking the actual payload so it's important to reduce that.