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TIPHON Protocol Transition: Implications and Architecture by Scott Cadzow

This document evaluates the session protocol needs and defines the transition from ROSE to FPT with IP stack or ROSE with IP stack. It covers TIPHON-specific data, interception flows, and real-time delivery requirements. Security measures include protection from DNS attacks and identification safeguards. FTP and ROSE comparisons are discussed with a focus on LEA preferences and application implications. The standardisation of protocols and existing standards in products is emphasized.

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TIPHON Protocol Transition: Implications and Architecture by Scott Cadzow

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  1. TIPHONLI implications Scott Cadzow

  2. Architecture

  3. TIPHON work • Actions from TC SEC LI • Evaluate the need for a session protocol • Define transition from ROSE to either FPT with IP stack, or ROSE with IP stack. • Internal actions • Define TIPHON specific data in ASN.1 • Define abstract interception flows to MF

  4. LI Requirement • On TIPHON • No local storage of Intercept records (HI2) and traffic (HI3) • Real time delivery of Intercept records and traffic • On LEA • Always on intercept record and traffic acceptance

  5. Further requirements • Standardisation • Existing standards available in existing products • Security • Protection from DNS attack on public interface • Trusted staff in the TIPHON operator environment • Target shall not be identifiable by other (traffic) analysis

  6. FTP versus ROSE • FTP is in favour with LEAs • Favour is accorded by economics • Simple (quick) to implement • ROSE supported by application builders • An application of a Remote Procedure Call (RPC) • Abstract specification • Requires application to make sense of the data

  7. LI in TIPHON • Known target standard = ES 201 671 • Abstract data already described • GSM, TETRA and ES 201 671 in ASN.1 • Target discovery to be described • Identify signalling mapping to record type • BEGIN, END, CONTINUE

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