Distribution of public keys

Distribution to all senders of confidential data.

• Manual;

• Using a shared secret;

• Ad-hoc using digital certificates.

Distribution to all receivers of digital signatures.

• Ad-hoc using digital certificates.

Trustworthy dissemination of public keys.

• Transitive trust paths/graphs.

  • If entity A trusts entity B and B trust in $K_x^+$, then A trust in $K_x ^+$

• Certification hierarchies/graphs.