A server that securely distributes cryptographic keys to authorized users, a key distribution center (KDC) is part of a cryptosystem intended to reduce the risks inherent in exchanging keys. KDCs often operate in systems within which some users may have permission to use certain services at some times and not at others.
Role in Cryptography
KDCs are essential for secure communication in cryptographic systems. They manage the distribution of secret keys, ensuring that only authorized users can access the keys necessary for encryption and decryption.
Components of a KDC
- Authentication Server: Verifies the identity of users before key distribution.
- Key Server: Generates and distributes the cryptographic keys.
Operation
KDCs typically use a ticket-granting ticket (TGT) system. When a user logs in, the KDC issues a TGT, which the user can then use to request service-specific tickets for accessing various services.