Cold Storage
Definition
Cold storage keeps cryptocurrency private keys on devices that never connect to the internet. Air-gapped computers, hardware wallets, and paper wallets provide cold storage. For quantum-resistant assets, cold storage combines offline security with post-quantum cryptography for maximum protection.
Technical Explanation
Cold storage eliminates remote attack vectors—hackers cannot steal keys from offline devices. Keys are generated offline, stored offline, and only used for signing on air-gapped machines. Signed transactions transfer to online devices via QR codes or USB for broadcast.
Post-quantum cold storage adapts to larger keys and signatures. SPHINCS+ signatures (7-49 KB) require more QR codes or appropriate USB transfer. Hardware wallet firmware updates support Kyber-768 and SPHINCS+ operations. The principle—keys never online—remains unchanged.
SynX Relevance
SynX supports cold storage workflows with quantum-resistant cryptography. Generate Kyber-768 and SPHINCS+ keys on air-gapped devices, sign transactions offline, and broadcast via online interfaces. Your quantum-resistant keys enjoy both cryptographic and physical security layers.
Frequently Asked Questions
- Is cold storage necessary for quantum resistance?
- No—quantum resistance is cryptographic. But cold storage adds defense-in-depth against all online attacks.
- Can hardware wallets do post-quantum crypto?
- Some are adding support. Larger signatures require firmware updates and possibly new hardware generations.
- How do I spend from cold storage?
- Create transaction on online device, sign on offline device, return signed transaction online for broadcast.
Maximum security: offline and quantum-resistant. Cold storage with SynX