Encryption At Rest

Encryption at Rest refers to the process of protecting stored data by converting it into an unreadable format using cryptographic algorithms. This ensures that even if a physical device — such as a hard drive, database, or cloud storage — is stolen or accessed without authorization, the information remains secure and useless to attackers without the proper decryption key.
The concept applies to various storage layers, including file systems, databases, and backups. Encryption at Rest is typically implemented using algorithms such as AES (Advanced Encryption Standard) or RSA, often combined with key management systems (KMS) to control who can decrypt the data.
This security measure is critical for compliance with data protection laws like GDPR, HIPAA, and ISO standards, especially in industries handling personal or financial information. By implementing Encryption at Rest, organizations strengthen data confidentiality and reduce the risk of breaches from lost or compromised storage media.