What encryption method is used by default for data at rest in OCI?

The encryption method used by default for data at rest in Oracle Cloud Infrastructure (OCI) is AES-256 encryption. AES, or Advanced Encryption Standard, is a widely adopted symmetric encryption algorithm known for its efficiency and security. AES-256 utilizes a 256-bit key size, providing a robust level of security ideal for protecting sensitive data.

This high level of encryption is particularly important in cloud environments where data is often stored on shared infrastructure, making it critical to safeguard against unauthorized access and data breaches. AES-256 is recognized and recommended by various security standards and regulations, ensuring compliance in industries that require stringent data protection measures.

The other options present different types of encryption that are not used by default for data at rest in OCI. For example, RSA is an asymmetric encryption algorithm typically used for securing data in transit and for creating digital signatures, not for encrypting data at rest. SSL, or Secure Socket Layer encryption, is primarily used for secure data transmission over networks, and AES-128, while still secure, does not provide the same level of protection as AES-256.