Method for backing up, in a smart card, a cryptographic seed held by a cryptoasset hardware wallet

A dual-encrypted communication channel using GlobalPlatform SCP03 and custom SCPB protocols with elliptic curve cryptography addresses security gaps in existing methods, offering a secure and user-involvable solution for cryptographic seed transfer and storage in smart cards.

WO2026146348A1PCT designated stage Publication Date: 2026-07-09LEDGER
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
LEDGER
Filing Date
2025-12-16
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Current methods for securing cryptographic seeds in smart cards lack robust security measures, particularly in the context of crypto-assets, with existing protocols like SCP03 being insufficient against sophisticated attacks, and SCP10 being costly and less available, while proprietary solutions face compatibility and flexibility issues.

Method used

A method involving a dual-encrypted communication channel using GlobalPlatform SCP03 and a custom SCPB channel, combined with elliptic curve cryptography, along with user verification and authentication, ensures secure transfer and storage of cryptographic seeds in smart cards.

Benefits of technology

Provides a highly secure and user-involvable process for transferring and storing cryptographic seeds, ensuring robust protection against attacks and compatibility with existing ecosystems.

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Abstract

The invention relates to a method for backing up, in a smart card (CD), a cryptographic seed (MS) held by a cryptoasset hardware wallet (HW), the method comprising the following steps: establishing, between the card and the hardware wallet, a first encrypted communication channel (SCPA) and then a second encrypted communication channel (SCPB) encapsulated in the first encrypted communication channel; inputting (S20), by means of the hardware wallet, a personal identification code (PIN) of the user and transmitting the personal identification code to the card in a doubly encrypted form; transmitting (S40), by means of the hardware wallet, the cryptographic seed to the card in a doubly encrypted form.
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