Access keys are not encryption keys: why IAM controls diverge

At a glance

What this is: This analysis separates access keys from encryption keys and shows why using one management model for both creates rotation, visibility and zero-trust failures.

Why it matters: IAM and NHI teams need distinct controls for credentials that govern runtime access, because treating machine access like data encryption obscures risk and prolongs compromise windows.

By the numbers:

• Stolen credentials were implicated in 22% of breaches in Verizon’s 2025 DBIR, showing how often access credentials become the initial foothold.
• GitGuardian reports that 64% of secrets exposed in 2022 were still valid four years later, which shows how long-lived access credentials can persist when managed poorly.
• Attackers probe exposed AWS credentials in under 17 minutes, leaving very little time to detect and revoke leaked access keys.
• IBM’s 2025 report put the global average cost of a data breach at $4.44 million, with U.S. incidents averaging $10.22 million.

Context

Access keys and encryption keys are both credentials, but they solve different problems. Encryption keys protect data, while access keys authenticate and authorise workloads, scripts, APIs and CI/CD pipelines. When organisations manage both through the same secrets and rotation model, they blur identity governance with data protection and create avoidable exposure.

That mismatch matters because access keys move constantly, get embedded in runtime environments and often outlive the context that justified them. The article frames this as an IAM and NHI governance problem: runtime access should be issued and revoked as identity, not stored and rotated like static cryptographic material.

Key questions

Q: What breaks when users manage their own encryption keys?

A: What breaks is the lifecycle. Users forget passphrases, lose keys during device changes, and leave old credentials behind when their role changes. That creates support overhead, weakens revocation, and makes audit trails unreliable. The control is technically strong but operationally fragile, which is why it fails in enterprise governance.

Q: Why do short-lived credentials reduce risk for workloads and privileged access?

A: Short-lived credentials reduce risk because they shrink the window in which a stolen secret can be reused and limit the value of persistent access. In cloud-native environments, this matters most when workloads spin up dynamically and access must be granted on demand. Ephemeral credentials also support zero trust by replacing standing trust with time-bound, task-specific access.

Q: What are the signs that access governance is failing in practice?

A: The clearest signs are slow remediation, repeated rubber stamp access reviews, and missed permissions outside traditional HR linked systems. If governance teams rely on manual audits, they often struggle to see access granted to non-human identities or systems adopted outside normal IT cycles. That usually means the organisation lacks reliable visibility and consistent enforcement of least privilege.

Q: Should organisations manage access keys and encryption keys separately?

A: Yes. Encryption keys protect data and usually belong in centralised cryptographic controls, while access keys authorise workloads and need runtime issuance, scoped permissions and tighter lifecycle visibility. Combining them under one policy hides the different failure modes and weakens governance. Separate controls make it easier to see which problem you are actually solving.

Technical breakdown

Why access keys are runtime identity, not encryption material

Access keys govern whether a workload, application or API can do something at a point in time. Encryption keys, by contrast, protect confidentiality and integrity of data at rest or in transit. The architectural difference is that access keys depend on an authentication decision, while encryption keys depend on controlled key usage. If teams store access keys as long-lived secrets, they turn a runtime authorisation problem into a static custody problem. That breaks the link between identity, context and action, which is why the same rotation and audit assumptions do not hold.

Practical implication: Treat access keys as identity credentials that require issuance and revocation logic, not as passive cryptographic assets.

Why one rotation policy fails across secrets, tokens and keys

A single rotation cadence works poorly when credentials have different lifecycles. Encryption keys often sit in central services and are used infrequently, while access keys may be injected into containers, copied into CI/CD pipelines and reused by workloads with no human oversight. If the policy is tuned for infrequent cryptographic use, it will either rotate access credentials too slowly or create blind spots in tracking what is still live. The result is lifecycle drift: credentials remain valid long after the operational need has changed, and audit evidence becomes incomplete.

Practical implication: Separate lifecycle controls by credential type and align rotation, revocation and visibility to actual runtime usage.

How static access keys violate zero trust for machine access

Zero trust requires continuous verification, scoped access and contextual decision-making. Static access keys defeat that model because they embed trust in a container, config file or pipeline before the workload is even running. Once copied, the credential can be reused outside the intended context, which means the system no longer knows who is presenting the access or why. In modern NHI governance, this is the core failure: authorisation is assumed at rest instead of decided at runtime. Secretless access patterns exist to restore that decision point.

Practical implication: Move machine access decisions to runtime so the control evaluates workload identity, context and scope before issuing access.

Threat narrative

Attacker objective: Use stolen or stale access keys to gain unauthorized machine access and expand into data exposure or privilege abuse.

1. Entry begins when exposed or reused access keys are copied into codebases, configs, containers or CI/CD pipelines.
2. Credential access occurs because the keys are valid runtime credentials, not data-protection material, so they authorize actions directly.
3. Escalation follows when long-lived keys remain active after their intended use, enabling unauthorized actions and privilege abuse.
4. Impact is unauthorized access, data leakage, audit failure or broader breach activity driven by persistent machine credentials.

Breaches seen in the wild

• Sumo Logic breach 2023: A compromised credential opened a Sumo Logic AWS account; customers were told to rotate API keys and stored credentials. No data impact was found.
• Codefinger S3 ransomware 2025: Codefinger used victims' compromised AWS keys to re-encrypt S3 buckets with SSE-C, set 7-day deletion and demanded ransom for the key.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

Access keys are an identity problem, not a storage problem: The article’s central insight is that runtime credentials fail when they are governed like encryption material. That framing matters because access keys authorize action, they do not merely protect data. For IAM and NHI programmes, the practical conclusion is that lifecycle and issuance controls must be designed around usage context, not vault custody.

Secret sprawl becomes credential governance debt: When access keys are copied into pipelines, environment variables and config files, the organisation accumulates hidden live access it cannot confidently inventory. That is not simply poor hygiene. It is governance debt, because the control model no longer reflects where the access actually lives or who can still use it. Practitioners should treat unknown credential placement as a lifecycle failure, not a cleanup task.

Runtime issuance is the dividing line between secure access and inherited trust: Short-lived, policy-based access changes the security question from 'where is the key stored?' to 'should this workload be allowed now?' That is the right question for cloud-native and machine-to-machine environments. The implication for practitioners is that static secrets management cannot be the primary control plane for operational access.

Access review assumptions collapse when the credential is meant to be ephemeral: Traditional review cadences assume a credential exists long enough to be discovered, recertified and revoked. Access keys used by workloads often do not fit that model. The result is a structural mismatch between IAM governance and machine behaviour, and teams need to rethink how identity evidence is generated at issuance time rather than at audit time.

Access-key governance now sits at the intersection of NHI, zero trust and breach prevention: The same misclassification that makes access keys look like encryption keys also weakens visibility, least privilege and incident response. That is why this topic is bigger than secrets handling. It is a control-design issue for cloud identity programmes, and practitioners should align access governance with workload identity semantics rather than inherited key-management habits.

What this signals

Credential custody is no longer enough: modern IAM programmes have to distinguish between a key that protects data and a credential that authorises action. When those controls are merged, organisations lose the ability to reason about runtime trust, and the result is stale access that survives long after the original workload need has passed.

Workload identity is the missing control boundary: access keys only become governable when the organisation can tie issuance to workload identity, context and policy. That shifts the control point from vault storage to runtime authorisation, which is where NHI risk actually exists in cloud-native environments.

For practitioners

• Separate access keys from encryption-key governance Inventory which credentials authenticate runtime access versus which keys protect data, then assign different lifecycle, rotation and audit controls to each class.
• Replace long-lived access keys with runtime issuance For workloads, APIs and CI/CD pipelines, issue short-lived credentials at the moment of use and revoke them when the session or task ends.
• Track where machine credentials actually live Map keys in source code, environment variables, containers, secret stores and build pipelines so hidden access does not escape inventory and review.
• Rebuild audit evidence around access decisions Capture which workload requested access, under what policy conditions and for what action, instead of relying on generic secret rotation logs.

Key takeaways

• Access keys and encryption keys have different security jobs, so managing them with the same policy creates avoidable governance gaps.
• The article ties that mismatch to credential exposure, weak visibility and long-lived access that can persist for years in real environments.
• Practitioners should separate credential classes, move machine access to runtime issuance and measure governance by current access decisions rather than vault inventory.

Key terms

• Access Key: An access key is a broad secret that grants direct access to an Azure storage account. It is typically long-lived and must be rotated manually or through automation because it does not expire on its own. In governance terms, it behaves like standing non-human privilege.
• Encryption Key: A key used to encrypt or decrypt data at rest or in transit. It protects confidentiality and integrity, usually through centralized custody and policy-driven rotation. Its lifecycle is typically more stable than workload credentials, which is why it should not be governed with the same operational model.
• Runtime Issuance: A pattern in which a workload receives a short-lived credential only at the moment it needs to act. This reduces standing exposure and aligns access with current context. For machine identities, runtime issuance is the control that replaces persistent secret storage with time-bound entitlement.
• Secretless Access: Secretless access is a pattern where workloads authenticate and receive access without relying on long-lived embedded credentials. It typically uses runtime identity verification, federation, and short-lived authorization decisions. The goal is to reduce exposure from hardcoded or reusable secrets while keeping machine-to-machine access functional.

Deepen your knowledge

NHI governance, machine identity security, and secrets management are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.