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Paper Abstract and Keywords
Presentation 2025-10-30 13:30
QCCC Coin Flipping with Constant Bias Implies One-Way Puzzles
Saku Mizuhara (Kyoto Univ.) COMP2025-9
Abstract (in Japanese) (See Japanese page) 
(in English) We show that a Quantum Computation with Classical Communication (QCCC) coin-flipping protocol secure against a constant bias of $frac{sqrt{2} - 1}{2} - o(1)$ implies the existence of one-way puzzles (OWPs). This result extends the work of Haitner and Omri (SIAM J. Comput., 2014) from the classical setting to the QCCC model, where parties perform local quantum computations and exchange classical messages. The proof adapts the framework of Haitner and Omri, showing it remains applicable even in QCCC model. This establishes an implication from an interactive protocol to a non-interactive cryptographic primitive in a hybrid quantum-classical model.
Keyword (in Japanese) (See Japanese page) 
(in English) QCCC / Coin Flipping / One-Way Puzzle / Quantum Cryptography / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 219, COMP2025-9, pp. 9-15, Oct. 2025.
Paper # COMP2025-9 
Date of Issue 2025-10-23 (COMP) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF COMP2025-9

Conference Information
Committee COMP  
Conference Date 2025-10-30 - 2025-10-30 
Place (in Japanese) (See Japanese page) 
Place (in English) 東北大学 青葉記念会館 4階 大研修室401 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Theoretical Computer Science, etc 
Paper Information
Registration To COMP 
Conference Code 2025-10-COMP 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) QCCC Coin Flipping with Constant Bias Implies One-Way Puzzles 
Sub Title (in English)  
Keyword(1) QCCC  
Keyword(2) Coin Flipping  
Keyword(3) One-Way Puzzle  
Keyword(4) Quantum Cryptography  
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1st Author's Name Saku Mizuhara  
1st Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2025-10-30 13:30:00 
Presentation Time 30 minutes 
Registration for COMP 
Paper # COMP2025-9 
Volume (vol) vol.125 
Number (no) no.219 
Page pp.9-15 
#Pages 7 
Date of Issue 2025-10-23 (COMP) 

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