A new IETF WG has been proposed in the Applications and Real-Time Area. The IESG has not made any determination yet. The following draft charter was submitted, and is provided for informational purposes only. Please send your comments to the IESG mailing list ([email protected]) by 2022-07-11.
Transfer dIGital cREdentialS Securely (tigress) ----------------------------------------------------------------------- Current status: BOF WG Chairs: TBD Assigned Area Director: Roman Danyliw <[email protected]> Applications and Real-Time Area Directors: Murray Kucherawy <[email protected]> Francesca Palombini <[email protected]> Mailing list: Address: [email protected] To subscribe: https://www.ietf.org/mailman/listinfo/secret Archive: https://mailarchive.ietf.org/arch/browse/secret/ Group page: https://datatracker.ietf.org/group/tigress/ Charter: https://datatracker.ietf.org/doc/charter-ietf-tigress/ There are many situations in which it is desirable to transfer a copy of a digital credential to another person. For example, a private car owner may want to provide access to their vehicle to a friend or a family member. A private home owner may want to provide access to their home to their cat sitter. An individual staying at a hotel may want to transfer a copy of a hotel room key to their spouse. Today, no such standardized method exists in a cross-platform, credential type-agnostic capacity. The WG charter includes the definition and standardization of a protocol that will facilitate such credential transfers from one person's device to another person's device. The protocol will leverage a "relay server" to transfer data from sender to recipient. The scope of the transfer is limited to a single origin device and a single destination device. Note: neither private keys nor secret symmetric keys present on the sender's device are exchanged during the transfer operation. In the transfer protocol, the "credential" being transferred from sender to recipient comprises data both necessary and sufficient for the recipient to exchange with the credential authority for new digital key material granting the recipient a subset of the sender's capabilities or entitlements. Privacy goals include: * The relay server should not see sensitive details of the share * The relay server should not be able to provision the credential itself, acting as an intermediary for the recipient (person-in-the-middle, impersonation attack) * Aside from potentially the IP address, the relay server should not learn the identity of the sender or receiver Sufficient security measures should be embedded in the protocol in an effort to: * Ensure only the intended recipient is able to provision the credential * Ensure the credential can only be provisioned once (anti-replay) * Ensure the sender has intent to share (proof of the fact that the share initiation is attributed to a valid device and a user) The solution the WG defines is expected to: * Allow a sender to initiate a share and select a relay server * Allow a recipient to view the share request, and provision the credential associated with the share upon receipt * Allow a sender and a recipient to perform multiple round trip communications within a limited time frame * Not require that both the sender and recipient have connectivity to the relay server at the same time * Support opaque message content based on the credential type * Support a variety of types of credentials, to include those adhering to public standards (e.g., Car Connectivity Consortium) and proprietary (i.e., non-public or closed community) formats The following topics are out of scope for the WG: * Defining the mechanism the receiver will use in order to provision the credential with the credential authority * The User Interface (UI) that is displayed to the sender or receiver during sending or receiving (this will depend on the device manufacturer's interface guidelines) * Defining the format or content of each field within the encrypted data (i.e., the provisioned credentials and associated information) stored on the relay server The WG will deliver a protocol to facilitate secure credential transfer. The WG must consider all Privacy and Security goals in an effort to perform the credential transfer in a secure manner. The protocol will use appropriate cryptographic mechanisms to protect the transferred credentials in accordance with the security and privacy goals described above. Milestones: Dec 2022 - WG adoption of the secure credential transfer protocol Dec 2023 - Submit secure credential transfer protocol to the IESG for publication _______________________________________________ IETF-Announce mailing list [email protected] https://www.ietf.org/mailman/listinfo/ietf-announce
