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Improved Strongly Deniable Authenticated Key Exchanges for Secure Messaging

Improved Strongly Deniable Authenticated Key Exchanges for Secure Messaging AbstractA deniable authenticated key exchange (DAKE) protocol establishes a secure channel without producing cryptographic evidence of communication. A DAKE offers strong deniability if transcripts provide no evidence even if long-term key material is compromised (offline deniability) and no outsider can obtain evidence even when interactively colluding with an insider (online deniability). Unfortunately, existing strongly deniable DAKEs have not been adopted by secure messaging tools due to security and deployability weaknesses.In this work, we propose three new strongly deniable key exchange protocols—DAKEZ, ZDH, and XZDH—that are designed to be used in modern secure messaging applications while eliminating the weaknesses of previous approaches. DAKEZ offers strong deniability in synchronous network environments, while ZDH and XZDH can be used to construct asynchronous secure messaging systems with offline and partial online deniability. DAKEZ and XZDH provide forward secrecy against active adversaries, and all three protocols can provide forward secrecy against future quantum adversaries while remaining classically secure if attacks against quantum-resistant cryptosystems are found.We seek to reduce barriers to adoption by describing our protocols from a practitioner’s perspective, including complete algebraic specifications, cryptographic primitive recommendations, and prototype implementations. We evaluate concrete instantiations of our DAKEs and show that they are the most efficient strongly deniable schemes; with all of our classical security guarantees, our exchanges require only 1 ms of CPU time on a typical desktop computer and at most 464 bytes of data transmission. Our constructions are nearly as efficient as key exchanges with weaker deniability, such as the ones used by the popular OTR and Signal protocols. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Proceedings on Privacy Enhancing Technologies de Gruyter

Improved Strongly Deniable Authenticated Key Exchanges for Secure Messaging

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Publisher
de Gruyter
Copyright
© 2018 Nik Unger et al., published by De Gruyter Open
ISSN
2299-0984
eISSN
2299-0984
DOI
10.1515/popets-2018-0003
Publisher site
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Abstract

AbstractA deniable authenticated key exchange (DAKE) protocol establishes a secure channel without producing cryptographic evidence of communication. A DAKE offers strong deniability if transcripts provide no evidence even if long-term key material is compromised (offline deniability) and no outsider can obtain evidence even when interactively colluding with an insider (online deniability). Unfortunately, existing strongly deniable DAKEs have not been adopted by secure messaging tools due to security and deployability weaknesses.In this work, we propose three new strongly deniable key exchange protocols—DAKEZ, ZDH, and XZDH—that are designed to be used in modern secure messaging applications while eliminating the weaknesses of previous approaches. DAKEZ offers strong deniability in synchronous network environments, while ZDH and XZDH can be used to construct asynchronous secure messaging systems with offline and partial online deniability. DAKEZ and XZDH provide forward secrecy against active adversaries, and all three protocols can provide forward secrecy against future quantum adversaries while remaining classically secure if attacks against quantum-resistant cryptosystems are found.We seek to reduce barriers to adoption by describing our protocols from a practitioner’s perspective, including complete algebraic specifications, cryptographic primitive recommendations, and prototype implementations. We evaluate concrete instantiations of our DAKEs and show that they are the most efficient strongly deniable schemes; with all of our classical security guarantees, our exchanges require only 1 ms of CPU time on a typical desktop computer and at most 464 bytes of data transmission. Our constructions are nearly as efficient as key exchanges with weaker deniability, such as the ones used by the popular OTR and Signal protocols.

Journal

Proceedings on Privacy Enhancing Technologies – de Gruyter

Published: Jan 1, 2018

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    Hu Xiong
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    Taechan Kim
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    Joseph
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    Bender
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    Shafi
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    Borisov
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    Andrew Chi
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    Sanjit Chatterjee
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    Kazuki Yoneyama
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    Canetti
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    Mihir Bellare
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    Fischlin
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    Alexander
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    Madden
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    Fangguo Zhang
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    URLhttps
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    Whitfield Diffie
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    Ben Lynn
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    Phillip Rogaway
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    Taek
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    Colin Boyd
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    Sebastian Faust
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    URLhttps
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    Yevgeniy Dodis
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    Taher ElGamal
  • Efficient Signature Generation by Smart Cards of
    Claus
  • Implementations of a fast Elliptic - curve Digital Signature Algorithm github com floodyberry ed donna Accessed
    Andrew Moon
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    Craig Costello
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    Juan
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    Luke Rosiak
  • Schwabe Post quantum Key Exchange New In th pages
    Erdem Alkim
  • Fiat How To Prove Yourself : Practical Solutions to Identification and Signature Problems InAdvances in Cryptology pages
    Amos
  • Mario Secure Off - the - Record Messaging InProceedings of the Workshop on Privacy in the Electronic pages
    Di Raimondo
  • and Tal Secure Distributed Key Generation for Discrete - Log Based InAdvances in pages
    Rosario Gennaro
  • and Extended Tower Number Field Sieve New Complexity for the Medium Case InAdvances in pages
    Taechan Kim
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    Roger
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    Unger
  • and Urs Hengartner Shatter : Using Threshold Cryptography to Protect Single Users with Multiple Devices InProceedings of the th ACM Conference on Privacy in Wireless and Mobile pages
    Erinn Atwater
  • Jonathan Adam and and On of Authentication of pages
    Yevgeniy Dodis
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    Neal Koblitz
  • Deniable Key Exchanges for Secure Messaging thesis University of Waterloo
    Unger
  • Aggregate and Verifiably Encrypted Signatures from Bilinear Maps InInternational Conference on the Theory and Applications of Cryptographic Techniques pages
    Dan Boneh
  • Jörn Müller Initiator - Resilient Universally Composable Key Exchange on Research in pages
    Dennis Hofheinz
  • How to Leak a Secret InInternational Conference on the Theory and Application of Cryptology and pages
    Ronald
  • Marc Notions of Deniable Message Authentication InProceedings of the th ACM Workshop on Privacy in the Electronic pages ISBN
    Fischlin
  • Validation of Elliptic Curve Public InPublic Key pages
    Adrian Antipa
  • On the Non - malleability of the Fiat - Shamir Transform InInternational Conference on Cryptology in India pages
    Sebastian Faust
  • Aggregate and Verifiably Encrypted Signatures from Bilinear Maps InInternational Conference on the Theory and Applications of Cryptographic Techniques pages
    Dan Boneh
  • An Efficient Fully Deniable Key Exchange Protocol Data
    Shaoquan Jiang
  • Open Whisper Systems Open Whisper Systems www whispersystems org Accessed
    URLhttps
  • New Directions in transactions on
    Whitfield Diffie
  • Jonathan Automated and Synthesis of Authenticated Encryption Schemes InProceedings of the nd Conference on and Communications pages
    Viet Tung Hoang
  • Sven TOPAS Pass Key Exchange with Full Perfect Forward Secrecy and Optimal Communication InProceedings of the nd Conference on Computer and Communications pages
    Schäge
  • Open Whisper Systems Open Whisper Systems www whispersystems org Accessed
    URLhttps