To satisfy the requirement of encrypting standard fields while maintaining their functionality within record-triggered flows, Shield Platform Encryption is the recommended architectural solution.1

Shield Platform Encryption is a modern security layer that allows for encryption at rest while 2preserving critical platform features. Unlike Classic Encryption (Option B)---which is limited to a specific 'Encrypted Text' custom field type and often breaks platform features like search and automation---Shield is designed to work with standard fields such as Name, Email, and Phone.

Key architectural considerations for Shield include:

Compatibility with Automation: Shield fields can be used in Flows, Apex triggers, and validation rules. This allows NTO to implement the required record-triggered business logic without needing to decrypt the data manually in code.

Search and Filtering: By using Deterministic Encryption, Shield allows users to filter and search for records based on encrypted fields, which is often a requirement for 'widely-used' standard fields.

Compliance and Governance: Shield provides advanced key management (Bring Your Own Key - BYOK) and auditing, ensuring that NTO meets corporate security guidelines while data is being processed by the platform.

Data Masking (Option C) is primarily used for sandboxes to obfuscate PII during testing and is not a production encryption-at-rest solution. By recommending Shield, the architect provides a transparent security model that protects sensitive data without sacrificing the declarative power of Flow Builder.