---
id: "papers-spac-privacy-strongest-authenticity-confidentiality"
type: "talk"
type_label: "Talks and presentations"
title: "SPAC (Secure Privacy, Authenticity, and Confidentiality): Privacy Given Strongest Authenticity and Confidentiality"
maintainer: "Samuel M. Smith"
authors:
  - "{'name': 'Samuel M. Smith'}"
date: "2023-06-17"
year: 2023
reading_level: "implementer"
reading_level_label: "Implementer"
reading_level_meaning: "developers working in or against the code"
evidence: "informative"
evidence_meaning: "an author's paper, deck, tutorial or post explaining the suite"
status: "quiet"
status_meaning: "no change in six to eighteen months; still correct"
access: "public"
access_meaning: "anyone with the link"
topics:
  - "theory"
  - "specifications"
roles:
  - "developer"
  - "security-architect"
  - "standards-policy"
  - "researcher"
source_url: "https://github.com/SmithSamuelM/Papers/blob/master/presentations/SPAC_Strawman.web.pdf"
source_license: null
source_license_note: null
found_on: "smith-papers"
kerisse_credit: false
abstract_license: "CC BY 4.0"
abstract_license_url: "https://creativecommons.org/licenses/by/4.0/"
abstract_attribution: "KSKB, the KERISuite Knowledge Base (https://kskb.dev/)"
last_checked: "2026-10-15"
kskb_url: "https://kskb.dev/cards/papers-spac-privacy-strongest-authenticity-confidentiality/"
kskb_app_url: "https://kskb.dev/#item/papers-spac-privacy-strongest-authenticity-confidentiality"
kskb_record_url: "https://kskb.dev/data/kskb/resources/papers-spac-privacy-strongest-authenticity-confidentiality"
kskb_markdown_url: "https://kskb.dev/export/cards/papers-spac-privacy-strongest-authenticity-confidentiality.md"
---

# SPAC (Secure Privacy, Authenticity, and Confidentiality): Privacy Given Strongest Authenticity and Confidentiality

A 76-slide deck by Samuel M. Smith dated 2023/06/17 presenting SPAC (Secure Privacy, Authenticity, and Confidentiality), a strawman protocol design that starts from the PAC theorem and ToIP (Trust over IP) design goals. It covers strong authenticity and IND-CCA2 confidentiality, ESSR (encrypt sender, sign receiver) messages, relationship graphs, direct and intermediated protocol forms, and privacy threats.

Labels: reading level Implementer; evidence informative (an author's paper, deck, tutorial or post explaining the suite).
Source: https://github.com/SmithSamuelM/Papers/blob/master/presentations/SPAC_Strawman.web.pdf (license not recorded).
The abstract is KSKB's own text under Creative Commons Attribution 4.0 (CC BY 4.0), https://creativecommons.org/licenses/by/4.0/; credit KSKB, the KERISuite Knowledge Base (https://kskb.dev/).