Blockchain Key Recovery via Escrowed Private Keys
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Solution Overview
Problem
Blockchain-based cryptocurrency wallets are vulnerable to cyber-theft due to reliance on single private keys, and existing multi-signature solutions introduce multiple points of failure if one share is lost, particularly in cases of server unavailability.
Innovation Solution
A method and system for cryptographic key recovery in blockchain networks involving encryption with a recovery public key, sending the encrypted key to a second device, and using a recovery escrow service to publish and retrieve the recovery private key in case of unavailability, ensuring decryption compatibility and key availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single private key is used for cryptocurrency wallet security, then the signing process is simple and fast, but the system becomes vulnerable to cyber-theft and lacks redundancy
Solution Approach 1:
The private key is segmented into multiple shares distributed across different devices. No single device holds the complete private key, thereby eliminating the single point of failure while enabling secure recovery through distributed key generation protocols.
Solution Approach 2:
Recovery keys and encrypted key shares are prepared in advance and stored securely before any loss or unavailability occurs. This preliminary setup enables rapid recovery without requiring complex real-time coordination when a device becomes unavailable.
2Reliability
If multiple keys are used for multi-signature security, then the system gains redundancy and fault tolerance, but it introduces multiple points of failure and increases complexity
Solution Approach 1:
A distributed key generation protocol acts as an intermediary mechanism that coordinates between multiple devices without requiring complex multi-signature workflows. The protocol enables automatic key reconstruction when threshold devices are available, simplifying the recovery process.
Solution Approach 2:
Encrypted copies of key shares are distributed to multiple devices, and a master copy is stored in escrow. These copies enable recovery through simple decryption operations rather than complex multi-signature verification, reducing operational complexity.
3Reliability
If a third-party key recovery service is used, then key availability is improved, but the system becomes susceptible to attacks on the service provider and loss of client control
Solution Approach 1:
The client encrypts their key shares with a recovery public key in advance and sends the encrypted version to the recovery service. The service only stores encrypted data and cannot access the actual keys, eliminating the attack surface while maintaining availability.
Solution Approach 2:
Cryptographic encryption serves as an intermediary layer between the client and recovery service. The service acts as a blind intermediary that can only decrypt using the client's own recovery private key, which the client controls, thereby maintaining client sovereignty.
4Reliability
If the primary device is made unavailable to prevent unauthorized access, then security is improved, but the system loses accessibility and requires complex recovery procedures
Solution Approach 1:
Encrypted key shares and recovery instructions are prepared in advance and stored on backup devices. When the primary device is unavailable, the user can immediately initiate recovery using the pre-prepared encrypted shares without complex procedures.
Solution Approach 2:
The recovery system is designed to be self-service oriented, where the client can independently recover their keys using pre-distributed encrypted shares and their own recovery private key, without requiring intervention from service providers or complex support procedures.
Data Source
AI summary
Methods and systems of recovering a cryptographic key associated with a blockchain based computer network, including encryption of at least a portion of a cryptographic key of the computer network with a recovery public key, sending of the encrypted at least a portion of the cryptographic key to at least one second computing device, sending of a recovery private key to a recovery escrow service, detection that the at least one first computing device is unavailable, publishing the recovery private key in a public repository, retrieving the recovery private key from the public repository, and decryption of the encrypted at least a portion of the cryptographic key by the at least one second computing device.