---
id: kb-2026-00099
title: Web Cryptography API
schema_type: TechArticle
category: computer-science
language: en
confidence: medium
last_verified: '2026-05-28'
created_date: '2026-05-22'
generation_method: human_only
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: af-web-cryptography-api-1
    statement: The Web Crypto API provides cryptographic primitives for web applications.
    source_title: Web Crypto API
    source_url: https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API
    confidence: medium
  - id: af-web-cryptography-api-2
    statement: The W3C Web Cryptography API specification defines an API for cryptographic operations in web applications.
    source_title: Web Cryptography API
    source_url: https://www.w3.org/TR/WebCryptoAPI/
    confidence: medium
  - id: af-web-cryptography-api-3
    statement: SubtleCrypto exposes methods for operations such as digesting, signing, verifying, encrypting, and decrypting.
    source_title: SubtleCrypto
    source_url: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto
    confidence: medium
completeness: 0.88
known_gaps:
  - Key management and protocol design beyond browser primitives
  - Browser compatibility and secure-context requirements
disputed_statements: []
primary_sources:
  - id: ps-web-cryptography-api-1
    title: Web Crypto API
    type: technical_documentation
    year: 2024
    institution: MDN Web Docs
    url: https://developer.mozilla.org/en-US/docs/Web/API/Web_Crypto_API
  - id: ps-web-cryptography-api-2
    title: Web Cryptography API
    type: standard
    year: 2017
    institution: W3C
    url: https://www.w3.org/TR/WebCryptoAPI/
  - id: ps-web-cryptography-api-3
    title: SubtleCrypto
    type: technical_documentation
    year: 2024
    institution: MDN Web Docs
    url: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto
secondary_sources: []
updated: '2026-05-28'
---
## TL;DR
The Web Crypto API exposes cryptographic operations to web applications. It provides primitives, not a complete security protocol.

## Core Explanation
Developers can use browser-provided cryptographic functions through SubtleCrypto, but secure design still requires careful key management and threat modeling.

## Detailed Analysis
The repaired article cites MDN and the W3C specification for API scope and supported operation categories.

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