Crypto
Protect Seed Phrase Fields in Crypto from Extension Theft
In crypto, seed phrase is one of the most targeted data types. Standard HTML inputs expose it to extension theft attacks. SmartField encrypts it at the keystroke level.
The Risk
Seed Phrase entered in a standard form is immediately accessible:
// Extension Theft attack:
document.querySelector('input').value
// "Seed Phrase data here" ← stolen
The Fix
<smart-field type="password" encrypt-key="/api/sf-key"
placeholder="seed phrase"></smart-field>
Now the same attack returns AES-256-GCM encrypted data. The seed phrase never exists as plaintext in the browser.
What the Attacker Gets
document.querySelector('smart-field').value
// "eyJ2IjoxLCJpdiI6IkNxT3..." ← 600+ chars of encrypted gibberish
Useless without your server's RSA-2048 private key.
Compliance
SmartField uses NIST-approved algorithms: AES-256-GCM (SP 800-38D) and RSA-2048 (SP 800-56B). Compatible with PCI-DSS, HIPAA, GDPR, SOX, and FISMA requirements.
Frequently Asked Questions
How does SmartField protect seed phrase in crypto?+
SmartField encrypts seed phrase at the keystroke level using AES-256-GCM. The data never exists as plaintext in the browser DOM. Extension Theft Protection is achieved through 13 independent security layers including closed Shadow DOM and WeakMap isolation.
Can extension theft attacks steal seed phrase?+
Not with SmartField. The .value property returns encrypted payloads only. The real seed phrase is stored in a WeakMap inside a closed Shadow DOM, invisible to any JavaScript including extension theft attacks.
How do I implement this?+
Replace your standard input with smart-field. 2 lines of HTML. Install the server SDK (Node.js, Python, Java, Go, PHP, or Ruby) to decrypt on your backend.
Related