JP6653268B2 - 異なるチャネル上で強力な認証イベントを伝えるシステム及び方法 - Google Patents

異なるチャネル上で強力な認証イベントを伝えるシステム及び方法 Download PDF

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JP6653268B2
JP6653268B2 JP2016566912A JP2016566912A JP6653268B2 JP 6653268 B2 JP6653268 B2 JP 6653268B2 JP 2016566912 A JP2016566912 A JP 2016566912A JP 2016566912 A JP2016566912 A JP 2016566912A JP 6653268 B2 JP6653268 B2 JP 6653268B2
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authentication
network
service
client device
authentication device
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JP2017519411A (ja
JP2017519411A5 (enExample
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フィリップ ドゥンケルバーガー
フィリップ ドゥンケルバーガー
ロルフ リンデマン
ロルフ リンデマン
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Nok Nok Labs Inc
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    • GPHYSICS
    • G06COMPUTING OR CALCULATING; COUNTING
    • G06QINFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00Payment architectures, schemes or protocols
    • G06Q20/38Payment protocols; Details thereof
    • G06Q20/40Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check credit lines or negative lists
    • G06Q20/401Transaction verification
    • G06Q20/4014Identity check for transactions
    • GPHYSICS
    • G06COMPUTING OR CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31User authentication
    • G06F21/33User authentication using certificates
    • G06F21/335User authentication using certificates for accessing specific resources, e.g. using Kerberos tickets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/08Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0807Network architectures or network communication protocols for network security for authentication of entities using tickets, e.g. Kerberos
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/20Network architectures or network communication protocols for network security for managing network security; network security policies in general
    • H04L63/205Network architectures or network communication protocols for network security for managing network security; network security policies in general involving negotiation or determination of the one or more network security mechanisms to be used, e.g. by negotiation between the client and the server or between peers or by selection according to the capabilities of the entities involved
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/321Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving a third party or a trusted authority
    • H04L9/3213Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving a third party or a trusted authority using tickets or tokens, e.g. Kerberos
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3215Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a plurality of channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3226Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3226Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN
    • H04L9/3228One-time or temporary data, i.e. information which is sent for every authentication or authorization, e.g. one-time-password, one-time-token or one-time-key
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3226Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN
    • H04L9/3231Biological data, e.g. fingerprint, voice or retina
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3247Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computing Systems (AREA)
  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Accounting & Taxation (AREA)
  • Software Systems (AREA)
  • Finance (AREA)
  • General Business, Economics & Management (AREA)
  • Strategic Management (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
  • Collating Specific Patterns (AREA)
JP2016566912A 2014-05-02 2015-05-01 異なるチャネル上で強力な認証イベントを伝えるシステム及び方法 Active JP6653268B2 (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US14/268,563 US20170109751A1 (en) 2014-05-02 2014-05-02 System and method for carrying strong authentication events over different channels
US14/268,563 2014-05-02
PCT/US2015/028924 WO2015168641A1 (en) 2014-05-02 2015-05-01 System and method for carrying strong authentication events over different channels

Publications (3)

Publication Number Publication Date
JP2017519411A JP2017519411A (ja) 2017-07-13
JP2017519411A5 JP2017519411A5 (enExample) 2018-06-21
JP6653268B2 true JP6653268B2 (ja) 2020-02-26

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JP2016566912A Active JP6653268B2 (ja) 2014-05-02 2015-05-01 異なるチャネル上で強力な認証イベントを伝えるシステム及び方法

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US (1) US20170109751A1 (enExample)
EP (1) EP3138232A4 (enExample)
JP (1) JP6653268B2 (enExample)
KR (1) KR102431834B1 (enExample)
CN (1) CN106233663B (enExample)
WO (1) WO2015168641A1 (enExample)

Families Citing this family (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9367676B2 (en) 2013-03-22 2016-06-14 Nok Nok Labs, Inc. System and method for confirming location using supplemental sensor and/or location data
US9887983B2 (en) 2013-10-29 2018-02-06 Nok Nok Labs, Inc. Apparatus and method for implementing composite authenticators
US10270748B2 (en) 2013-03-22 2019-04-23 Nok Nok Labs, Inc. Advanced authentication techniques and applications
US9961077B2 (en) 2013-05-30 2018-05-01 Nok Nok Labs, Inc. System and method for biometric authentication with device attestation
US9654469B1 (en) 2014-05-02 2017-05-16 Nok Nok Labs, Inc. Web-based user authentication techniques and applications
US20150319227A1 (en) 2014-05-05 2015-11-05 Invensys Systems, Inc. Distributed historization system
GB201408539D0 (en) * 2014-05-14 2014-06-25 Mastercard International Inc Improvements in mobile payment systems
US10148630B2 (en) 2014-07-31 2018-12-04 Nok Nok Labs, Inc. System and method for implementing a hosted authentication service
US9875347B2 (en) 2014-07-31 2018-01-23 Nok Nok Labs, Inc. System and method for performing authentication using data analytics
KR20160084663A (ko) * 2015-01-06 2016-07-14 삼성전자주식회사 메시지를 송신하는 디바이스 및 방법
US9614845B2 (en) 2015-04-15 2017-04-04 Early Warning Services, Llc Anonymous authentication and remote wireless token access
JP6507863B2 (ja) * 2015-06-03 2019-05-08 富士ゼロックス株式会社 情報処理装置及びプログラム
US10182040B2 (en) * 2015-06-10 2019-01-15 Massachusetts Institute Of Technology Systems and methods for single device authentication
US10084782B2 (en) * 2015-09-21 2018-09-25 Early Warning Services, Llc Authenticator centralization and protection
US10778435B1 (en) * 2015-12-30 2020-09-15 Jpmorgan Chase Bank, N.A. Systems and methods for enhanced mobile device authentication
US11593804B2 (en) * 2016-03-24 2023-02-28 Jpmorgan Chase Bank, N.A. Authentication system and method
KR101760211B1 (ko) * 2016-04-04 2017-07-21 엔에이치엔엔터테인먼트 주식회사 안구 인식을 통해 보안이 강화된 인증 방법 및 시스템
US10769635B2 (en) 2016-08-05 2020-09-08 Nok Nok Labs, Inc. Authentication techniques including speech and/or lip movement analysis
US10637853B2 (en) 2016-08-05 2020-04-28 Nok Nok Labs, Inc. Authentication techniques including speech and/or lip movement analysis
US10348713B2 (en) * 2016-09-16 2019-07-09 Oracle International Corporation Pluggable authentication for enterprise web application
US10091195B2 (en) * 2016-12-31 2018-10-02 Nok Nok Labs, Inc. System and method for bootstrapping a user binding
US10237070B2 (en) 2016-12-31 2019-03-19 Nok Nok Labs, Inc. System and method for sharing keys across authenticators
CN106878298B (zh) * 2017-02-08 2019-11-29 飞天诚信科技股份有限公司 一种认证设备与网站的集成方法、系统及装置
WO2018202284A1 (en) * 2017-05-03 2018-11-08 Telefonaktiebolaget Lm Ericsson (Publ) Authorizing access to user data
US10735407B2 (en) * 2017-07-26 2020-08-04 Secret Double Octopus Ltd. System and method for temporary password management
US10601814B2 (en) 2017-07-26 2020-03-24 Secret Double Octopus Ltd. System and method for temporary password management
JP7091057B2 (ja) * 2017-11-22 2022-06-27 キヤノン株式会社 情報処理装置、情報処理装置における方法、およびプログラム
US11868995B2 (en) 2017-11-27 2024-01-09 Nok Nok Labs, Inc. Extending a secure key storage for transaction confirmation and cryptocurrency
US11831409B2 (en) 2018-01-12 2023-11-28 Nok Nok Labs, Inc. System and method for binding verifiable claims
EP3762844A4 (en) 2018-03-07 2021-04-21 Visa International Service Association SECURE REMOTE TOKEN RELEASE WITH ONLINE AUTHENTICATION
CA3097092C (en) * 2018-04-20 2024-02-13 Vishal Gupta Decentralized document and entity verification engine
US11882438B2 (en) * 2018-10-29 2024-01-23 Zorday IP, LLC Network-enabled electronic cigarette
CN111435932B (zh) * 2019-01-14 2021-10-01 华为技术有限公司 一种令牌处理方法及装置
KR102758937B1 (ko) * 2019-02-18 2025-01-23 삼성전자주식회사 생체 정보를 인증하기 위한 전자 장치 및 그의 동작 방법
US12041039B2 (en) 2019-02-28 2024-07-16 Nok Nok Labs, Inc. System and method for endorsing a new authenticator
US11792024B2 (en) 2019-03-29 2023-10-17 Nok Nok Labs, Inc. System and method for efficient challenge-response authentication
US20210204116A1 (en) 2019-12-31 2021-07-01 Payfone, Inc. Identity verification platform
US20210358043A1 (en) * 2020-05-12 2021-11-18 Tellus App, Inc. Systems and methods for interface-driven engagement
CZ2020271A3 (cs) * 2020-05-14 2021-11-24 Aducid S.R.O. Programový systém a způsob autentizace
US11899759B2 (en) 2020-11-25 2024-02-13 Plurilock Security Solutions Inc. Side-channel communication reconciliation of biometric timing data for user authentication during remote desktop sessions
IT202100007976A1 (it) * 2021-03-31 2022-10-01 Mannaro Srls Sistema di autenticazione con comunicazione forte
CZ2021366A3 (cs) * 2021-08-04 2023-02-15 Aducid S.R.O. Systém a způsob pro řízený přístup k cílové aplikaci
US12126613B2 (en) 2021-09-17 2024-10-22 Nok Nok Labs, Inc. System and method for pre-registration of FIDO authenticators

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6510236B1 (en) * 1998-12-11 2003-01-21 International Business Machines Corporation Authentication framework for managing authentication requests from multiple authentication devices
AU2001288679A1 (en) * 2000-09-11 2002-03-26 Sentrycom Ltd. A biometric-based system and method for enabling authentication of electronic messages sent over a network
FI115098B (fi) * 2000-12-27 2005-02-28 Nokia Corp Todentaminen dataviestinnässä
GB0210692D0 (en) * 2002-05-10 2002-06-19 Assendon Ltd Smart card token for remote authentication
JP4374904B2 (ja) * 2003-05-21 2009-12-02 株式会社日立製作所 本人認証システム
WO2006062998A2 (en) 2004-12-07 2006-06-15 Farsheed Atef System and method for identity verification and management
WO2006063118A2 (en) * 2004-12-07 2006-06-15 Pure Networks, Inc. Network management
EP1955251A2 (en) * 2005-10-11 2008-08-13 Citrix Systems, Inc. Systems and methods for facilitating distributed authentication
US20080028453A1 (en) * 2006-03-30 2008-01-31 Thinh Nguyen Identity and access management framework
GB0703759D0 (en) * 2007-02-27 2007-04-04 Skype Ltd A Communication system
US8001582B2 (en) * 2008-01-18 2011-08-16 Microsoft Corporation Cross-network reputation for online services
US8555078B2 (en) * 2008-02-29 2013-10-08 Adobe Systems Incorporated Relying party specifiable format for assertion provider token
US8359632B2 (en) * 2008-05-30 2013-01-22 Microsoft Corporation Centralized account reputation
US20130125222A1 (en) * 2008-08-19 2013-05-16 James D. Pravetz System and Method for Vetting Service Providers Within a Secure User Interface
US8666904B2 (en) * 2008-08-20 2014-03-04 Adobe Systems Incorporated System and method for trusted embedded user interface for secure payments
US20110197267A1 (en) * 2010-02-05 2011-08-11 Vivianne Gravel Secure authentication system and method
US8776204B2 (en) * 2010-03-12 2014-07-08 Alcatel Lucent Secure dynamic authority delegation
US8528069B2 (en) * 2010-09-30 2013-09-03 Microsoft Corporation Trustworthy device claims for enterprise applications
US8566915B2 (en) * 2010-10-22 2013-10-22 Microsoft Corporation Mixed-mode authentication
US9130837B2 (en) * 2012-05-22 2015-09-08 Cisco Technology, Inc. System and method for enabling unconfigured devices to join an autonomic network in a secure manner
US9589399B2 (en) * 2012-07-02 2017-03-07 Synaptics Incorporated Credential quality assessment engine systems and methods
TW201417598A (zh) * 2012-07-13 2014-05-01 Interdigital Patent Holdings 安全性關聯特性
US9374369B2 (en) * 2012-12-28 2016-06-21 Lookout, Inc. Multi-factor authentication and comprehensive login system for client-server networks

Also Published As

Publication number Publication date
CN106233663A (zh) 2016-12-14
WO2015168641A1 (en) 2015-11-05
HK1231647A1 (zh) 2017-12-22
US20170109751A1 (en) 2017-04-20
EP3138232A1 (en) 2017-03-08
KR20170041657A (ko) 2017-04-17
CN106233663B (zh) 2019-10-18
EP3138232A4 (en) 2017-11-22
KR102431834B1 (ko) 2022-08-10
JP2017519411A (ja) 2017-07-13

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