FIDO2
Fast Identity Online 2
An authentication standard enabling passwordless login through hardware security keys or biometrics using public key cryptography.
Chi tiết kỹ thuật
FIDO2's security rests on the computational difficulty of factoring large semiprimes. Key sizes: 2048-bit is the current minimum, 4096-bit is recommended for long-term security. RSA is ~1000x slower than AES, so it's typically used to encrypt a symmetric session key (hybrid encryption). RSA signing uses the private key; verification uses the public key — the reverse of encryption. OAEP padding (PKCS#1 v2) is required; the older PKCS#1 v1.5 padding has known vulnerabilities (Bleichenbacher's attack).
Ví dụ
```javascript
// FIDO2 — Web Crypto API example
const data = new TextEncoder().encode('sensitive data');
const hash = await crypto.subtle.digest('SHA-256', data);
const hex = Array.from(new Uint8Array(hash))
.map(b => b.toString(16).padStart(2, '0')).join('');
```
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