Answer:
The Oracle Cloud Infrastructure (OCI) Vault service recognizes the following two types of encryption keys:
1. Master Encryption Keys: Master encryption keys are used to protect data encryption keys within the OCI Vault service. These keys provide an additional layer of security by encrypting the data encryption keys themselves.
2. Data Encryption Keys: Data encryption keys are used to encrypt and decrypt data stored within the OCI Vault service. These keys are specific to the data being encrypted and provide the actual encryption and decryption functionality.
It's worth mentioning that while OCI Vault service supports these two types of encryption keys, it does not specifically recognize "auth tokens," "alias keys," or "wrapper keys" as distinct key types within its encryption key management framework.