Punch Card Key Backup: Offline 128-bit Key Storage
2025-05-31
The pckb project offers a unique way to backup 128-bit information onto a physical punch card. Users generate a hole-punch pattern using a provided HTML tool and then physically punch holes in an aluminum sheet. Recovery is equally straightforward, simply inputting the punch card pattern back into the HTML tool. The project also outlines solutions for keys larger than 128 bits and includes a comprehensive FAQ.