Because encryption is the trust layer behind authentication, session protection, and certificate-based identity. If key strength is too low, attackers can undermine the confidentiality and integrity that human and non-human identity systems rely on, even when access policy looks correct on paper.
Why This Matters for Security Teams
Weak encryption is not just a cryptography problem. It directly affects whether IAM can prove who or what is connecting, whether sessions stay intact, and whether certificates or tokens remain trustworthy under attack. When key sizes, algorithms, or implementations fall behind current guidance, an attacker may recover secrets, tamper with identity assertions, or replay credentials that should have been protected. That is especially dangerous for machine identity programmes, where trust is often automated and scaled across services.
For non-human identities, the practical impact shows up in secret theft, certificate abuse, and broken trust chains. NHIMG’s Ultimate Guide to NHIs notes that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, which is why encryption strength and key handling cannot be treated as background controls. The broader control expectation also fits the NIST Cybersecurity Framework 2.0, which ties identity assurance to protection of the underlying mechanisms that make access decisions possible. In practice, many security teams discover weak encryption only after a token, certificate, or secret has already been harvested and reused.
How It Works in Practice
IAM and machine identity programmes rely on encryption at several layers at once. Transport encryption protects login flows and token exchanges. Public key cryptography protects certificates, mutual TLS, and signed assertions. Key wrapping and vault encryption protect stored secrets at rest. If any of those layers use obsolete algorithms, short keys, weak randomness, or poor certificate lifecycles, the identity system can still “authenticate” while quietly becoming easier to impersonate.
That is why current guidance tends to focus on both cryptographic strength and operational hygiene. Security teams should verify:
- Strong, modern algorithms for transport, signing, and encryption, with a documented deprecation path for legacy cryptography.
- Short-lived certificates and tokens, because longer lifetimes increase the value of anything an attacker can decrypt or steal.
- Proper key rotation and revocation so compromised material is not useful for long periods.
- Secrets stored only in approved systems, not in code, logs, chat, or build artifacts.
- Validation of certificate chains, mutual TLS trust anchors, and service-to-service authentication controls.
NHIMG’s Top 10 NHI Issues and 52 NHI Breaches Analysis both reinforce the same operational reality: once secrets or certificates are exposed, downstream access control often cannot distinguish legitimate use from abuse. That is why encryption must be measured as part of identity assurance, not as an isolated infrastructure setting. These controls tend to break down in hybrid environments where legacy applications, third-party integrations, and unmanaged certificates keep older cryptography alive.
Common Variations and Edge Cases
Tighter encryption and stronger key management often increase operational overhead, requiring organisations to balance assurance against compatibility, latency, and administrative burden. That tradeoff is real, especially in distributed systems with embedded devices, older service meshes, or third-party platforms that do not support modern cipher suites.
Best practice is evolving, and there is no universal standard for every environment yet. Some teams can move quickly to stronger TLS and shorter certificate lifetimes, while others need staged migration to avoid breaking authentication paths. In high-volume machine identity environments, the bigger risk is often not the strongest algorithm on paper, but weak implementation details such as shared keys, hardcoded secrets, or certificates that are never revoked. NHIMG’s research shows that many organisations still struggle with basic NHI hygiene, which makes encryption failures more consequential when they occur.
For identity programmes, the key question is not only whether encryption exists, but whether it is protecting the exact trust boundary IAM depends on. That includes signing keys, token encryption, vaults, and service-to-service channels. When those protections are inconsistent across environments, attackers usually target the weakest link rather than the most visible control.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Weak crypto often exposes NHI secrets, tokens, and certificates to theft. |
| NIST CSF 2.0 | PR.DS | Encryption is a core protection for identity data and credentials. |
| NIST Zero Trust (SP 800-207) | SC-12 | Zero Trust depends on trusted cryptographic mechanisms for identity proofing. |
Inventory NHI secrets and ensure encryption, storage, and rotation meet current cryptographic standards.
