Secure Passkeys with WASM: A Deep Dive

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Passkeys, based on the FIDO2 standard’s WebAuthn and CTAP components, provide a passwordless authentication approach in which browsers communicate with authenticators while cryptographic operations generate and use keys. The article argues that WebAssembly can strengthen passkey implementations by isolating sensitive cryptographic code from potentially compromised JavaScript, reducing exposure to vulnerabilities such as cross-site scripting while supporting consistent deployment across browsers and operating systems. A modular WASM architecture can allow separate, replaceable components for functions such as elliptic-curve cryptography, hashing, and random-number generation, making security updates, testing, library changes, and hardware acceleration easier to manage. It also notes that developers must address limited WASM memory, module size, page-load impact, and cryptographic performance through optimization, compression, profiling, and efficient data handling. Didit promotes its platform as offering prebuilt cryptographic WASM modules, a modular design, scalable cloud infrastructure, and security features for organizations integrating passkeys.

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