---
id: "papers-cryptoperiod-catastrophe"
type: "talk"
type_label: "Talks and presentations"
title: "Cryptoperiod Catastrophe: Misapplication of bare signatures/anon-signatures to non-ephemeral verifiable credential"
maintainer: "Samuel M. Smith"
authors:
  - "Samuel M. Smith"
date: "2026-04"
year: 2026
reading_level: "practitioner"
reading_level_label: "Practitioner"
reading_level_meaning: "architects, product people and adopters who know identity systems"
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:
  - "cryptography"
  - "theory"
roles:
  - "developer"
  - "security-architect"
  - "communications"
  - "researcher"
source_url: "https://github.com/SmithSamuelM/Papers/blob/master/presentations/CryptoperiodCatastrophe.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-cryptoperiod-catastrophe/"
kskb_app_url: "https://kskb.dev/#item/papers-cryptoperiod-catastrophe"
kskb_record_url: "https://kskb.dev/data/kskb/resources/papers-cryptoperiod-catastrophe"
kskb_markdown_url: "https://kskb.dev/export/cards/papers-cryptoperiod-catastrophe.md"
---

# Cryptoperiod Catastrophe: Misapplication of bare signatures/anon-signatures to non-ephemeral verifiable credential

A 29-slide deck by Samuel M. Smith arguing, from the cryptoperiod concept in NIST SP 800-57, that bare or anonymous signatures are misapplied to long-lived verifiable credentials and entitlements. It covers key exposure risk, closed and open loop entitlement verification, identity attack statistics for 2024, and the case for issuances anchored to rotatable key state.

Labels: reading level Practitioner; evidence informative (an author's paper, deck, tutorial or post explaining the suite).
Source: https://github.com/SmithSamuelM/Papers/blob/master/presentations/CryptoperiodCatastrophe.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/).