What are the schemes that implement revocation for capabilities?

Answer 1

Revocation schemes for capabilities typically include methods like capability lists, which maintain a record of active capabilities that can be invalidated, and capability tokens, where capabilities are embedded within tokens that can be retracted or replaced. Another approach is the use of revocation servers that track and manage the status of capabilities, enabling centralized control over access rights. Additionally, time-based revocation can be implemented, where capabilities automatically expire after a certain period. These methods ensure that access can be effectively managed and revoked when necessary.