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

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

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 TypesPreferable Network SizeDescription
Key Distribution Center (KDC)deals with symmetric keysLAN
  • has to be online
  • compromised KDC does decrypt messages
  • not scalable
Certification Authority (CA) deals with asymmetric keysWAN
  • does not have to be online
  • compromised CA does NOT decrypt messages
  • scalable
  • used for secure web browsing
Trusted Anchor (TA)deals with asymmetric keysWAN
  • similar to CA
  • used for securing BGP