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```mermaid
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sequenceDiagram
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Alice-X+Repeater: Add contact
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Repeater--X-Alice: repeater's public key, timestamp
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Alice-X+Bob: repeater's public key, timestamp
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Bob--X-Alice: Bob's public key, timestamp, mac
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Alice-X+Repeater: Bob's public key, timestamp, mac
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Repeater->>Repeater: shared secret (ECDHE)
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Repeater->>Repeater: create sym. key from shared secret
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Repeater->>Repeater: derive transport keys
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Repeater--X-Alice: repeater's mac, contact id, transport properties
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Alice-XBob: repeater's mac, transport properties
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activate Bob
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Bob->>Bob: shared secret (ECDHE)
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Bob->>Bob: create sym. key from shared secret
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Bob->>-Bob: derive transport keys
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Bob-->Repeater: Secure communication
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```
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The asymmetric keys are newly created ephemeral keys. |
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\ No newline at end of file |
