MASVS-CRYPTO is the OWASP MASVS control area covering cryptographic design and implementation in mobile applications. It focuses on preventing extractable keys, unsafe algorithms, and weak handling of sensitive material. Teams use it to validate that crypto choices remain resilient against reverse engineering and runtime compromise.
Expanded Definition
MASVS-CRYPTO is the MASVS control area for cryptography in mobile applications, but its scope is narrower than “use encryption.” It is about whether cryptographic choices, key handling, storage, and runtime protections are implemented so that sensitive material remains protected even when an attacker can inspect the app package or interact with the device. In practice, that means the control area covers algorithm selection, key generation, secret storage, and the avoidance of patterns that make extracted keys or reusable secrets easy to recover.
OWASP frames this as part of mobile application security validation, so the primary question is not whether crypto exists, but whether it can withstand realistic reverse engineering and tampering. A common boundary mistake is to treat platform APIs as automatically safe; secure primitives still fail when developers hard-code keys, reuse weak modes, or place trust in client-side secrecy that the device cannot guarantee.
For readers comparing adjacent ideas, MASVS-CRYPTO is about cryptographic implementation quality, while broader mobile security requirements also cover authentication, storage, and transport controls. The OWASP Mobile Application Security Verification Standard provides the surrounding validation structure that gives this control area its meaning.
Examples and Use Cases
MASVS-CRYPTO shows up whenever a mobile team has to prove that sensitive data is not protected by brittle or reversible crypto patterns. The most useful examples are the ones where the application must survive offline analysis, rooted-device inspection, or hostile runtime conditions.
- A banking app stores session-related material in encrypted form, but the protection only holds if the key is not embedded in the APK or derivable from predictable device data.
- A health or payments app uses platform crypto APIs to encrypt local caches, but validation still needs to confirm that the chosen mode, padding, and key lifecycle are appropriate for the data class.
- An enterprise mobile client signs requests or protects configuration data, and the design must ensure that secrecy does not depend on code that can be decompiled and replayed.
- A customer-facing app uses certificate pinning or secure transport alongside local cryptography, but the crypto layer still has to be tested separately because transport security does not fix weak at-rest handling.
- A mobile product team adopts hardware-backed key storage where available, accepting the tradeoff that stronger protection may come with device fragmentation and recovery complexity.
Security Implications
When MASVS-CRYPTO is weak, the failure is usually not “encryption is missing” but “the encryption can be undone.” Extractable keys, hard-coded secrets, reused IVs, deprecated algorithms, and insecure randomness can turn protected data into recoverable plaintext once the app is reverse engineered or instrumented at runtime.
The practical impact is broad because mobile apps often hold tokens, cached records, API material, or user data that should remain protected outside the server boundary. If the cryptographic design assumes the client can keep secrets indefinitely, a motivated attacker may recover credentials, tamper with protected state, or replay sensitive operations from a modified build.
That creates both confidentiality loss and integrity loss. It also weakens incident response, because a team may believe data is safe simply because it is “encrypted,” while the real issue is that the implementation made the key or the decryption path easy to reach. The observable symptoms are often subtle: repeated use of a fixed secret, unexpected success after decompilation, or identical ciphertext patterns where randomized protection should exist.
Domain and Governance Relevance
In mobile security, MASVS-CRYPTO matters because cryptography is often the last line of defense after the app leaves the developer’s trust boundary. The term is not about abstract cryptographic theory; it is about whether the implementation remains resistant under conditions mobile attackers routinely exploit, including package inspection, instrumentation, emulation, and memory access.
From a governance perspective, teams need a review standard for what counts as acceptable crypto usage, because “encrypted” is not the same as “resilient.” That distinction changes code review, security testing, and release readiness: validation has to cover key lifecycle, algorithm choice, and secret exposure paths, not just whether a library call exists.
For organisations that ship regulated or high-value mobile apps, this control area also helps define accountability between application engineering, platform teams, and security reviewers. It gives them a concrete basis for deciding whether a cryptographic dependency is strong enough for the data being protected, rather than relying on an assumption that client-side secrecy will hold on its own.
Risk and Threat Considerations
MASVS-CRYPTO is exposed to a classic mobile threat pattern: attackers do not need to break the cryptography if they can recover keys, weaken randomness, or intercept the data after it is decrypted in memory. The risk is highest when the app treats the client device as a trusted vault instead of an environment that can be inspected and instrumented.
Failure mechanism: weak key storage, embedded secrets, static cryptographic material, or deprecated algorithms create a path for reverse engineering, runtime hooking, or offline analysis to reveal protected content or enable forgery.
Impact: confidentiality can collapse, signed or encrypted data can be replayed or modified, and the organisation may lose control over token material, cached records, or other sensitive mobile-side assets.
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 and MITRE ATT&CK address the attack surface, CIS Controls v8 and NIST CSF 2.0 set the technical controls, and PCI DSS v4.0 define the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 — Secrets and Credential Management | Weak mobile crypto often exposes reusable secrets and keys. |
| Recommendation — Store keys outside the app binary and rotate any exposed secret material quickly. | ||
| CIS Controls v8 | 3 — Data Protection | MASVS-CRYPTO protects sensitive mobile data at rest and in use. |
| Recommendation — Encrypt sensitive mobile data with strong key management and validated algorithms. | ||
| MITRE ATT&CK | T1635 — Steal Application Access Token | Compromised mobile crypto can expose tokens and other reusable secrets. |
| Recommendation — Hunt for token exposure paths when app crypto or local storage is weak. | ||
| NIST CSF 2.0 | PR.DS-1 — Data-at-rest protection | The control area directly concerns protecting stored sensitive data. |
| Recommendation — Protect stored mobile data with encryption that remains resilient under analysis. | ||
| PCI DSS v4.0 | 3 — Protect Stored Account Data | Payments apps using mobile crypto must safeguard stored sensitive account data. |
| Recommendation — Verify that mobile apps never embed keys used to protect payment data. | ||
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on September 10, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
