Which type of encryption is a standard for S3 bucket encryption?

AWS S3 supports several types of encryption, but the standard encryption method used for S3 bucket encryption is AES-256. This encryption standard is part of the Advanced Encryption Standard (AES) and is widely recognized for its security and efficiency in protecting sensitive data.

When S3 bucket encryption is enabled, AWS uses AES-256 to encrypt data at rest. This means that the data stored in the buckets is automatically encrypted using this algorithm before it is written to disk, ensuring that it is secure and unreadable without proper authorization. AES-256 is also suitable for many applications and complies with various regulatory standards, making it a popular choice among organizations for securing data.

Other options such as AES-128, RSA, and DES do not serve as the standard for S3 bucket encryption. AES-128, while part of the AES family, is not the default or commonly recommended option due to its lower key length. RSA is an asymmetric encryption algorithm used primarily for secure key distribution and is not typically used for encrypting data at rest. DES, which is an older symmetric key encryption standard, has been largely phased out due to vulnerabilities and is not recommended for modern security practices.