TL;DR: 24-word phrases are NOT more secure than 12-word phrases. They're just longer.
The Technical Reality
Watch: Expert explanation on recovery phrase security (starts at relevant timestamp)
The Science Behind Seed Phrases
After extensive conversation and review from cryptography experts, here's what matters:
"The amount of entropy used for generating wallets is 128 bits. An extended private key like a 24-word mnemonic beyond 128 bits is all just wasted entropy."
What This Means
✅ 12 words = 128 bits of entropy (cryptographically secure)
✅ 24 words = 256 bits of entropy (same security, double the hassle)
⚠️ Extra entropy beyond 128 bits provides zero additional security
Why KeepKey Uses 12 Words
Longer phrases waste your time without improving security.
Benefits of 12-Word Seeds
Equally Secure - 128 bits is more than sufficient
Faster Recovery - Half the words to write down and enter
Less Error-Prone - Fewer words = fewer chances for mistakes
Industry Standard - Used by many leading hardware wallets
Security By The Numbers
12 words: 2^128 possible combinations (340,282,366,920,938,463,463,374,607,431,768,211,456)
Time to brute force: Longer than the age of the universe
Practical difference from 24 words: Zero
Can KeepKey Restore 24-Word Seeds?
Yes! While KeepKey generates 12-word seeds, you can restore 24-word seeds.
Perfect for:
🔹 Migrating from Ledger to KeepKey
🔹 Restoring wallets from other hardware wallets
🔹 Using KeepKey as a backup device
Expert Consensus
The cryptography community agrees:
✅ 128 bits (12 words) is cryptographically secure
✅ 256 bits (24 words) adds no practical security benefit
✅ The real security comes from keeping your seed phrase offline and private
Summary
12 words is not "less secure" than 24 words. It's simply more practical.
