| Internet-Draft | tigress-requirements | November 2022 |
| Vinokurov, et al. | Expires 10 May 2023 | [Page] |
This document describes the use cases necessitating the secure transfer of digital credentials between two devices and defines general assumptions, requirements and the scope of the corresponding Tigress Internet-draft [Tigress-00].¶
This note is to be removed before publishing as an RFC.¶
The latest revision of this draft can be found at https://datatracker.ietf.org/doc/draft-tigress-requirements/. Status information for this document may be found at https://datatracker.ietf.org/doc/draft-tigress-requirements/.¶
Source for this draft and an issue tracker can be found at https://github.com/dimmyvi/tigress-requirements.¶
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TODO Introduction¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
General terms:¶
mermaid
sequenceDiagram
actor S as Sender
participant I as Intermediary
actor R as Receiver
S ->> I : upload credential data
break Generic messaging channel
S ->> R : send invite
end
Loop Provision credential
R ->> I : request credential data
I ->> R : deliver credential data
end
¶
If the solution requires an intermediary server, it should have the following requirements.¶
A number of existing solutions / protocols have been reviewed in order to be used for secure credential transfer based on the requirements: GSS-API, Kerberos, AWS S3, email, Signal. None of the existing protocols comply with the requirements; the effort of modifying the existing protocols has been accessed to be significantly higher than introducing a new solution to solve this problem. The goal of the Tigress draft [Tigress-00] is not to define a new encryption or secure message exchange protocol, but rather a standardized mechanism of exchanging access-specific encrypted credential information.¶
The Provisioning Information MAY be sent from Sender to Receiver over an arbitrary messaging channel that supports binary file transfer, but this would not support provisioning flows which require multiple round trips as requied by (Req-RoundTrips).¶
GSS-API [RFC2078] and Kerberos [RFC4120] are authentication technologies which could be used to authenticate Sender, Receiver and intermediary. However, as they provide strong authentication, they would allow the Intermediary server to build a social graph in violation of (Req-Privacy). Their setup also require strong coordination between the actors of the system which seems overly costly for the intended system. AWS S3 could be used as an Intermediary server but it would force all participants to use a specific cloud service which is in violation of (Req-AnyPlatorm).¶
As a messaging protocol, Signal could be used between Sender, Receiver and Intermediary but this protocol is fairly complex and its use would most like violate (Req-Simplicity). The system will however support the Signal service for share initiation, in line with (Req-init).¶
TODO Security¶
This document has no IANA actions.¶
TODO acknowledge.¶