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Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys

A deterministic and public technology, applied to public keys for secure communication, secure communication devices, and key distribution, which can solve problems such as poor key management and high computing costs

Active Publication Date: 2018-07-17
NCHAIN HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are computationally expensive in some cases, such as where new secrets need to be continuously generated and shared
[0006] An alternative asymmetric key hierarchy (such as described in the Bitcoin Developer's Guide) relies on random seeds and indexing structures, resulting in poor key management

Method used

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  • Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys
  • Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys
  • Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys

Examples

Experimental program
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Embodiment Construction

[0091] review

[0092] A method, device and system for determining the common secret (CS) of a first node (C), which is the same as the public secret of a second node (S), will now be described. figure 1 A system 1 is illustrated comprising a first node 3 in communication with a second node 7 via a communication network 5 . The first node 3 has associated first processing means 23 and the second node 5 has associated second processing means 27 . The first node 3 and the second node 7 may include electronic devices, such as computers, tablet computers, mobile communication devices, computer servers, and the like. In one example, the first node 3 may be a client device and the second node 7 may be a server.

[0093] The first node 3 has the first node master private key (V 1C ) and the primary public key of the first node (P 1C ) is associated with the first asymmetric cipher pair. The second node (7) has the second node master private key (V 1S ) and the second node mas...

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PUM

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Abstract

A method (300) and system (1) of determining a common secret for two nodes (3, 7). Each node (3, 7) has a respective asymmetric cryptography pair, each pair including a master private key and a masterpublic key. Respective second private and public keys may be determined based on the master private key, master public key and a deterministic key. A common secret may be determined at each of the nodes based on the second private and public keys. In one example, a node (3, 7) may determine the common secret based on (i) a second private key based on the node's own master private key and the deterministic key; and (ii) a second public key based on the other node's master public key and the deterministic key. The invention may be suited for use with, but not limited to, digital wallets, blockchain (e.g. Bitcoin) technologies and personal device security.

Description

technical field [0001] The invention relates to the determination of a common secret for two nodes. In some applications, public secrets can be used in cryptography to enable secure communication between two nodes. The present invention may be suitable for, but not limited to, use with digital wallets, blockchain (eg, Bitcoin) technology, and personal device security. Background technique [0002] Cryptography involves techniques for secure communication between two or more nodes. Nodes may include mobile communication devices, tablet computers, laptop computers, desktop computers, other forms of computing and communication devices, server devices in a network, client devices in a network, one or more nodes in a distributed network, and the like. A node can be associated with a natural person, a group of people such as employees of a company, a system such as a banking system, etc. [0003] In some cases, two or more nodes may be connected by an insecure communication net...

Claims

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Application Information

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IPC IPC(8): G06Q20/38H04L9/30H04L9/32H04L9/08
CPCH04L9/008H04L9/08H04L9/0825H04L9/0838H04L9/0844H04L9/0861H04L9/3066H04L2209/56
Inventor 克雷格·史蒂文·赖特史蒂芬·萨凡纳
Owner NCHAIN HLDG LTD