Encryption

Overview

Encryption protects data confidentiality by applying a cryptographic algorithm and key to plaintext. Symmetric encryption uses the same secret or related secrets for encryption and decryption, while public-key techniques use mathematically linked public and private keys.

Encryption does not automatically provide integrity, authenticity, access control, or secure key handling. Modern systems commonly use authenticated encryption so unauthorized modification is detected, while protocols separately establish key identity, context, freshness, and permission.

Organizations should use reviewed standards, strong keys, safe modes, unique nonces or initialization vectors, secure key management, and explicit rotation and recovery procedures. Protection must cover endpoints and metadata because authorized applications can expose plaintext after successful decryption.

The data and cryptography workflow for Encryption should locate where evidence enters, where a rule or judgment is applied, what state changes, and which downstream service relies on the result.

Communication about Encryption should separate confirmed facts, working hypotheses, assumptions, unknowns, and decisions.

Encryption is a security mechanism or control discipline that transforms readable information into ciphertext so only holders of authorized cryptographic keys can recover the protected content. Encryption protects confidentiality only within a defined boundary; keys, endpoints, integrity, metadata, and authorization still require separate controls.

A production treatment of Encryption should test a security mechanism or control discipline that transforms readable information into ciphertext so only holders of authorized cryptographic keys can recover the protected content within the relevant asset, decision, or service state. The Encryption context record for security mechanism should preserve source data, configuration or policy version, responsible actor, exception, and outcome. Review of Encryption should determine whether safeguards addressing security mechanism changed exposure in practice, not merely whether a document or setting existed.