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Trusted Intermediaries (TI) - Trusted Third Party (TTP)

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In cryptography, a Trusted Intermediary (TI) or Trusted Third Party (TTP) is an entity that facilitates interactions between two parties who both trust the third party

Trusted Intermediaries Types

Trusted Intermediaries Types

Key Types

Preferable Network Size

Description

Key Distribution Center (KDC)

deals with symmetric keys

LAN
  • has to be online
  • compromised KDC does decrypt messages
  • not scalable

Certification Authority (CA)

deals with asymmetric keys

WAN
  • does not have to be online
  • compromised CA does NOT decrypt messages
  • scalable
  • used for secure web browsing

Trusted Anchor (TA)

deals with asymmetric keys

WAN
  • similar to CA
  • used for securing BGP