SG10201805995VA - Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys - Google Patents

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

Info

Publication number
SG10201805995VA
SG10201805995VA SG10201805995VA SG10201805995VA SG10201805995VA SG 10201805995V A SG10201805995V A SG 10201805995VA SG 10201805995V A SG10201805995V A SG 10201805995VA SG 10201805995V A SG10201805995V A SG 10201805995VA SG 10201805995V A SG10201805995V A SG 10201805995VA
Authority
SG
Singapore
Prior art keywords
key
common secret
master
determining
deterministic
Prior art date
Application number
SG10201805995VA
Inventor
Craig Steven Wright
Stephane Savanah
Original Assignee
Nchain Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB1603117.1A external-priority patent/GB201603117D0/en
Application filed by Nchain Holdings Ltd filed Critical Nchain Holdings Ltd
Publication of SG10201805995VA publication Critical patent/SG10201805995VA/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
    • H04L9/0825—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s) using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
    • H04L9/0841—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving Diffie-Hellman or related key agreement protocols
    • H04L9/0844—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving Diffie-Hellman or related key agreement protocols with user authentication or key authentication, e.g. ElGamal, MTI, MQV-Menezes-Qu-Vanstone protocol or Diffie-Hellman protocols using implicitly-certified keys
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/008—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols involving homomorphic encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/30—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy
    • H04L9/3066—Public key, i.e. encryption algorithm being computationally infeasible to invert or user's encryption keys not requiring secrecy involving algebraic varieties, e.g. elliptic or hyper-elliptic curves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/56—Financial cryptography, e.g. electronic payment or e-cash

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 master public 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. (Fig. 1)
SG10201805995VA 2016-02-23 2017-02-16 Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys SG10201805995VA (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1603117.1A GB201603117D0 (en) 2016-02-23 2016-02-23 Determining a common secret for two blockchain nodes for the secure exchange of information
GB201619301 2016-11-15

Publications (1)

Publication Number Publication Date
SG10201805995VA true SG10201805995VA (en) 2018-08-30

Family

ID=58213271

Family Applications (2)

Application Number Title Priority Date Filing Date
SG11201805472RA SG11201805472RA (en) 2016-02-23 2017-02-16 Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys
SG10201805995VA SG10201805995VA (en) 2016-02-23 2017-02-16 Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys

Family Applications Before (1)

Application Number Title Priority Date Filing Date
SG11201805472RA SG11201805472RA (en) 2016-02-23 2017-02-16 Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys

Country Status (27)

Country Link
US (3) US10652014B2 (en)
EP (3) EP3268914B1 (en)
JP (1) JP6515246B2 (en)
KR (1) KR20180116278A (en)
CN (2) CN108292402B (en)
AU (1) AU2017223133B2 (en)
BR (1) BR112018016245A2 (en)
CA (1) CA3010116A1 (en)
CL (1) CL2018002363A1 (en)
CO (1) CO2018009236A2 (en)
DK (1) DK3268914T3 (en)
ES (1) ES2687182T3 (en)
GB (1) GB2561728B (en)
HK (1) HK1251840A1 (en)
HR (1) HRP20181373T1 (en)
HU (1) HUE040631T2 (en)
IL (1) IL260895B (en)
LT (1) LT3268914T (en)
MX (1) MX2018009356A (en)
PH (1) PH12018550109A1 (en)
PL (1) PL3268914T3 (en)
PT (1) PT3268914T (en)
SG (2) SG11201805472RA (en)
SI (1) SI3268914T1 (en)
TW (2) TWI725124B (en)
WO (1) WO2017145016A1 (en)
ZA (1) ZA201708483B (en)

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