notes: research/papers/kerione-spac-presentation

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research/papers/kerione-spac-presentation SPAC (Secure Privacy, Authenticity, and Confidentiality) summary v0.1 — 2026-10-14: drafted by Claude from the PDF (79 slides); unread by Mark; marked partner on Mark's word 2026-10-21, paraphrase only partner 428 # SPAC (Secure Privacy, Authenticity, and Confidentiality) **Abstract.** A 79-slide deck, subtitled 'Privacy Given Strongest Authenticity and Confidentiality', that presents the SPAC white paper: the PAC theorem, the three-party exploitation model, ESSR-based authenticated encryption, relationship and intermediary protocols, sustainable privacy and threat mitigations. It is for readers who want the SPAC argument in slides before the long paper. ## Summary The deck follows the SPAC (Secure Privacy, Authenticity, and Confidentiality) white paper and links to it on slide 2. It opens with the PAC theorem (any two of privacy, authenticity and confidentiality at the highest level, not all three) and the Trust Over IP (ToIP) design goals, then separates privacy from confidentiality, including legal definitions and surveillance law, and states the "surveillance privacy problem": strong authenticity and confidentiality are achievable, while privacy of addresses is weaker. Slides 11 to 17 define privacy protection as protection from exploitation of correlatable identifiers, introduce the three-party exploitation model, autonomic identifiers (AIDs) as unbounded-term identifiers, and the dual properties of end verifiability and end-only viewability. Slides 18 to 27 set the cryptographic baseline: SUF-CMA (strong unforgeability under chosen message attack) signatures with Ed25519, IND-CCA2 (indistinguishability under adaptive chosen ciphertext attack) encryption via ECIES or HPKE and the libsodium sealed box, why HPKE alone does not give authenticity, and ESSR (Encrypt Sender, Sign Receiver). Slides 28 to 45 cover relationships and relationship graphs, cryptonyms, out-of-band setup, the multiple overlay spiral, protocol syntax, the direct protocol, relationship formation, and shared and non-shared intermediaries. Slides 48 to 62 cover identity theft, sustainable privacy and the time value of information, clandestine versus covert mechanisms, re-identification, exploiters, aggregator threats and mitigations, and risk ranking. Backup slides repeat background on DNS and BGP hijacking, the identifier system security overlay, confidentiality overlays, trust domain appraisability and zero-trust architecture. ## Key terms PAC theorem, three-party exploitation model, end-only viewability, SUF-CMA, IND-CCA2, ESSR, cryptonym, intermediary, sustainable privacy, covert versus clandestine ## Claims and their evidence - IND-CCA2 encryption alone is insufficient for strong authenticity of the ciphertext (slide 23). [informative] - ESSR protects against both key compromise impersonation and sender impersonation of the ciphertext (slides 25-26). [informative] - Covert approaches may be more robust to leakage, and so more sustainable, than clandestine ones (slide 53). [informative] - Strong authenticity and confidentiality are achievable, but privacy with respect to addresses is weaker (slide 8). [informative] ## Related Secure Privacy Authenticity Confidentiality (SPAC); Sustainable Privacy; KERI White Paper. ## Provenance Drafted by Claude on 2026-10-14 from the PDF, read through every slide title and the title page text. Not yet read by Mark.

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