{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T10:20:16Z","timestamp":1780914016848,"version":"3.54.1"},"reference-count":20,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2024,3,13]],"date-time":"2024-03-13T00:00:00Z","timestamp":1710288000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004837","name":"Spanish Ministry of Science and Innovation","doi-asserted-by":"publisher","award":["PID2021-124613OB-I00"],"award-info":[{"award-number":["PID2021-124613OB-I00"]}],"id":[{"id":"10.13039\/501100004837","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cryptography"],"abstract":"<jats:p>Priced oblivious transfer (POT) is a cryptographic protocol designed for privacy-preserving e-commerce of digital content. It involves two parties: the merchant, who provides a set of priced items as input, and a customer, who acquires one of them. After the protocol has run, the customer obtains the item they chose, while the merchant cannot determine which one. Moreover, the protocol guarantees that the customer gets the content only if they have paid the price established by the merchant. In a recent paper, the authors proposed a POT system where the payments employed e-coin transactions. The strong point of the proposal was the absence of zero-knowledge proofs required in preceding systems to guarantee the correctness of payments. In this paper, we propose a novel e-coin-based POT system with a fast item retrieval procedure whose running time does not depend on the number of items for sale. This is an improvement over the aforementioned existing proposal whose execution time becomes prohibitively long when the catalog is extensive. The use of zero-knowledge proofs is neither required.<\/jats:p>","DOI":"10.3390\/cryptography8010010","type":"journal-article","created":{"date-parts":[[2024,3,13]],"date-time":"2024-03-13T03:46:31Z","timestamp":1710301591000},"page":"10","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["E-Coin-Based Priced Oblivious Transfer with a Fast Item Retrieval"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7217-5227","authenticated-orcid":false,"given":"Francesc","family":"Seb\u00e9","sequence":"first","affiliation":[{"name":"Department of Mathematics, University of Lleida, C. Jaume II, 69, E-25001 Lleida, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7000-6382","authenticated-orcid":false,"given":"Sergi","family":"Sim\u00f3n","sequence":"additional","affiliation":[{"name":"Department of Mathematics, University of Lleida, C. Jaume II, 69, E-25001 Lleida, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,13]]},"reference":[{"key":"ref_1","first-page":"135","article-title":"E-Commerce Trend Analysis and Management for Industry 5.0 using User Data Analysis","volume":"11","author":"Ahmad","year":"2023","journal-title":"Int. J. Intell. Syst. Appl. Eng."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"629","DOI":"10.1007\/s12525-019-00375-6","article-title":"Privacy concerns in E-commerce: A taxonomy and a future research agenda","volume":"30","author":"Bandara","year":"2020","journal-title":"Electron. Mark."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Chaum, D., Rivest, R.L., and Sherman, A.T. (1983). Advances in Cryptology, Springer.","DOI":"10.1007\/978-1-4757-0602-4"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Stinson, D.R. (1994). Advances in Cryptology\u2014CRYPTO\u2019 93, Springer.","DOI":"10.1007\/3-540-48329-2"},{"key":"ref_5","unstructured":"Nakamoto, S. (2024, February 21). Bitcoin: A Peer-to-Peer Electronic Cash System. Available online: http:\/\/www.bitcoin.org\/bitcoin.pdf."},{"key":"ref_6","unstructured":"Perlroth, N., Griffith, E., and Benner, K. (The New York Times, 2021). Pipeline Investigation Upends Idea That Bitcoin Is Untraceable, The New York Times."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1254","DOI":"10.1137\/S0097539704383633","article-title":"Oblivious Polynomial Evaluation","volume":"35","author":"Naor","year":"2006","journal-title":"SIAM J. Comput."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Kolesnikov, V., Kumaresan, R., Rosulek, M., and Trieu, N. (2016, January 24\u201328). Efficient Batched Oblivious PRF with Applications to Private Set Intersection. Proceedings of the CCS\u201916: 2016 ACM SIGSAC Conference on Computer and Communications Security, Vienna, Austria.","DOI":"10.1145\/2976749.2978381"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Pfitzmann, B. (2001). Advances in Cryptology\u2014EUROCRYPT 2001, Springer.","DOI":"10.1007\/3-540-44987-6"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Bernstein, D.J., and Lange, T. (2010). Progress in Cryptology\u2014AFRICACRYPT 2010, Springer.","DOI":"10.1007\/978-3-642-12678-9"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Sion, R. (2010). Financial Cryptography and Data Security, Springer.","DOI":"10.1007\/978-3-642-14577-3"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"280","DOI":"10.1109\/TIFS.2017.2746058","article-title":"Private mobile pay-TV from priced oblivious transfer","volume":"13","author":"Biesmans","year":"2017","journal-title":"IEEE Trans. Inf. Forensics Secur."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Hao, F., Ruj, S., and Sen Gupta, S. (2019). Progress in Cryptology\u2014INDOCRYPT 2019, Springer.","DOI":"10.1007\/978-3-030-35423-7"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Borges, R., and Seb\u00e9, F. (2023). An e-Coin Based Construction for Unlinkable Priced Oblivious Transfer. Comput. J., bxad031.","DOI":"10.1093\/comjnl\/bxad031"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Borges, R., and Seb\u00e9, F. (2021). A digital cash paradigm with valued and no-valued e-coins. Appl. Sci., 11.","DOI":"10.3390\/app11219892"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1109\/TIT.1985.1057074","article-title":"A public key cryptosystem and a signature scheme based on discrete logarithms","volume":"31","author":"Gamal","year":"1985","journal-title":"IEEE Trans. Inf. Theory"},{"key":"ref_17","unstructured":"Chaum, D., and Pedersen, T.P. (1992, January 16\u201320). Wallet Databases with Observers. Proceedings of the CRYPTO \u201992: 12th Annual International Cryptology Conference on Advances in Cryptology, Santa Barbara, CA, USA."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"3225","DOI":"10.1007\/s11277-021-08177-w","article-title":"Robust Digital Watermarking Techniques for Copyright Protection of Digital Data: A Survey","volume":"118","author":"Kadian","year":"2021","journal-title":"Wirel. Pers. Commun."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Naor, M. (2007). Advances in Cryptology\u2014EUROCRYPT 2007, Springer.","DOI":"10.1007\/978-3-540-72540-4"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1007\/978-3-319-22174-8_3","article-title":"The Simplest Protocol for Oblivious Transfer","volume":"Volume 9230","author":"Chou","year":"2015","journal-title":"Proceedings of the 4th International Conference on Progress in Cryptology\u2014LATINCRYPT 2015"}],"container-title":["Cryptography"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2410-387X\/8\/1\/10\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:12:43Z","timestamp":1760105563000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2410-387X\/8\/1\/10"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,3,13]]},"references-count":20,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2024,3]]}},"alternative-id":["cryptography8010010"],"URL":"https:\/\/doi.org\/10.3390\/cryptography8010010","relation":{},"ISSN":["2410-387X"],"issn-type":[{"value":"2410-387X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,3,13]]}}}