Aliases

Disambiguation

Mode-5 failure refers to malfunction or degradation of the Mode-5 Identification Friend or Foe (IFF) system, a NATO-standard encrypted military identification system. Distinct from Mode 4 (legacy system) and Mode S (civilian variant).

Stats

Concept

Malfunction, degradation, or security compromise of the Mode-5 NATO-standard cryptographically encrypted Identification Friend or Foe (IFF) system used to distinguish friendly from hostile aircraft; potential failure modes include equipment failure, encryption key compromise, spoofing vulnerability, and interoperability breakdown.

Mau funcionamento, degradação ou compromisso de segurança do sistema Mode-5, padrão OTAN de Identificação Amigo-Inimigo (IFF) criptografado usado para distinguir aeronaves amigas de hostis; modos de falha potenciais incluem falha de equipamento, comprometimento de chave de criptografia, vulnerabilidade a spoofing e quebra de interoperabilidade.

Enrichment

• Identification friend or foe - Wikipedia
  Wikipedia▎ high· 2026-05-14
  • Mode-5 is a cryptographically secured version of Mode S
  • NATO ratified STANAG 4193 in 2002 adopting Mark XIIA Mode 5 standard
  • NATO began upgrading systems to Mode 5 around 2016
  • Mode-5 reply was vulnerable to spoofing, requiring NSA/NATO-approved solutions
• Are You Friend or Foe? Why the New NATO Mode 5 Requirement Matters
  Sagetech Avionics▎ high· 2026-05-14
  • Mode-5 was ordered by US Joint Chiefs of Staff in 1995
  • Uses NSA-certified spread-spectrum with encryption keys changing every few seconds
  • Became only NATO standard by June 2020
  • Goal of 100% NATO Mode 5 capability by 2030
• Mark XIIA Mode 5 Identification Friend or Foe (IFF)
  U.S. Department of Defense▎ high· 2026-05-14
  • Official DoD test methodology and evaluation criteria for Mode-5 systems
  • Documents persistent issues requiring resolution
  • Covers operational and security standards verification