TL;DR

Data encryption converts readable information into ciphertext using a cryptographic key, making it unreadable to anyone without the corresponding decryption key. For recruitment platforms, encryption is the baseline control that determines whether a stolen database or intercepted transmission is a breach or a non-event.

What Data Encryption Means in Practice

Encryption comes in two states, and both are required. Encryption at rest protects data stored on disk - database tables, file storage, backups. Encryption in transit protects data moving between systems - API calls, browser sessions, data replication. A system that encrypts at rest but transmits over plain HTTP, or encrypts in transit but stores plaintext on disk, has a gap that attackers will find.

For encryption at rest, the current standard is AES-256 (Advanced Encryption Standard with 256-bit keys). Cloud providers implement this transparently - AWS S3, GCP Cloud Storage, and Azure Blob Storage all offer AES-256 at rest by default or with a single configuration change. The critical question is key management: who holds the encryption keys, where are they stored, and who can access them. AWS Key Management Service, Google Cloud KMS, and Azure Key Vault are the standard solutions. Storing encryption keys in the same location as the encrypted data defeats the purpose.

For encryption in transit, TLS 1.2 is the minimum acceptable standard as of 2024; TLS 1.3 is preferred. TLS 1.0 and 1.1 are deprecated and disabled by default in modern browsers. Any recruitment platform still supporting TLS 1.0 for legacy integrations is operating below baseline security standards. HSTS (HTTP Strict Transport Security) headers should be configured to prevent protocol downgrade attacks.

Field-level encryption deserves specific attention in recruitment systems. A candidate's national insurance number, passport number, or bank account details (for payroll processing in staffing) represent the highest-sensitivity data in the system. These fields warrant encryption at the application layer, separate from database-level encryption, so that even a database administrator cannot read them in plaintext without going through the application's key management.

Why Data Encryption Matters for Recruitment Teams

Under [GDPR](/glossary/gdpr), encryption is explicitly listed as an appropriate technical measure. Article 32 requires controllers and processors to implement "encryption of personal data" as part of a risk-appropriate security posture. Critically, Recital 83 and Article 34(3)(a) provide that notification to affected individuals is not required after a breach if the personal data was rendered unintelligible - which means properly encrypted data on a stolen laptop or compromised server may not trigger individual notification obligations. That distinction can be the difference between a contained incident and a public notification requirement.

For staffing agencies, the practical stakes are high. Agencies hold data on job seekers who have not consented to their information being exposed to the agency's clients, the agency's competitors, or the general public. A breach of unencrypted candidate data triggers GDPR Article 33 supervisory authority notification (72 hours), GDPR Article 34 individual notification, potential fines up to €20 million or 4% of global annual turnover (whichever is higher), reputational damage, and in some jurisdictions, class action exposure.

HR software vendors and ATS providers face scrutiny from enterprise procurement teams that include security questionnaires asking specifically about encryption standards, key management practices, and whether client data is segregated in multi-tenant environments. Vendors that cannot answer these questions precisely lose evaluations.

Data Encryption in Action

A [staffing agency](/glossary/staffing-agency) uses an ATS to manage 150,000 candidate records including right-to-work documents, salary history, and bank details for contractor payroll. The vendor's database server is misconfigured and briefly exposed to the internet. An attacker downloads the database. Because the database uses AES-256 encryption at rest with keys managed in a separate vault, and field-level encryption on all financial data, the downloaded file is unusable without the encryption keys - which were never on the compromised server. The agency's legal team reviews GDPR Article 34(3)(a), confirms the data was rendered unintelligible, and issues no individual notifications. The incident is reported to the ICO as a near-miss.

Compliance Checklist