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status-secure-transport-spec.md
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> Version: 0.1 (Draft) > Version: 0.1 (Draft)
> >
> Author: Andrea Piana <andreap@status.im>, Pedro Pombeiro <pedro@status.im>, Corey Petty <corey@status.im>, Oskar Thorén <oskar@status.im> > Author: Andrea Piana <andreap@status.im>, Pedro Pombeiro <pedro@status.im>, Corey Petty <corey@status.im>, Oskar Thorén <oskar@status.im>, Dean Eigenmann <dean@status.im
## Abstract ## Abstract
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### Initialization ### Initialization
A new session is initialized once a successful X3DH exchange has taken place. A new session is initialized once a successful X3DH exchange has taken place. Subsequent messages will use the established session until re-keying is necessary.
Subsequent messages will use the established session until re-keying is necessary.
### Concurrent sessions ### Concurrent sessions
If two sessions are created concurrently between two peers the one with the symmetric key first in byte order should be used, marking the other has expired. If two sessions are created concurrently between two peers the one with the symmetric key, first in byte order should be used this marks that the other has expired.
### Re-keying ### Re-keying
@ -372,7 +371,7 @@ Expired session should not be used for new messages and should be deleted after
When a bundle is received from `IK` a timer is initiated on any `installation-id` belonging to `IK` not included in the bundle. If after 7 days no bundles are received from these devices they are marked as `stale` and no message will be sent to them. When a bundle is received from `IK` a timer is initiated on any `installation-id` belonging to `IK` not included in the bundle. If after 7 days no bundles are received from these devices they are marked as `stale` and no message will be sent to them.
# Security Considerations ## Security Considerations
The same considerations apply as in [section 4 of the X3DH spec](https://signal.org/docs/specifications/x3dh/#security-considerations) and [section 6 of the Double Ratchet spec](https://signal.org/docs/specifications/doubleratchet/#security-considerations), with some additions detailed below. The same considerations apply as in [section 4 of the X3DH spec](https://signal.org/docs/specifications/x3dh/#security-considerations) and [section 6 of the Double Ratchet spec](https://signal.org/docs/specifications/doubleratchet/#security-considerations), with some additions detailed below.