Oracle Cloud Infrastructure (OCI) uses various encryption keys to secure data and communications within its infrastructure. These keys are recognized and utilized for different purposes. Here are some key encryption types and their purposes in Oracle Cloud Infrastructure:

1. Master Encryption Key (MEK): This is the root key used to protect other keys within OCI. It’s typically generated and managed by Oracle and is responsible for encrypting and decrypting data encryption keys (DEKs) and other sensitive information.

2. Data Encryption Key (DEK): DEKs are used to encrypt and decrypt data at rest. They are unique to each object or volume being protected. DEKs are also protected by the MEK.

3. Key Encryption Key (KEK): KEKs are used to encrypt and decrypt DEKs. They provide an additional layer of security for DEKs and are often associated with specific compartments or resources within OCI.

4. Customer-Managed Keys (CMKs): OCI allows customers to bring their own encryption keys. CMKs are keys generated and managed by customers themselves. These keys can be used to protect data at rest and can be integrated with various OCI services.