Wang, X., Lin, L., & Wang, Y. (2023). Stealth address schemes with fast retrievability based on subgroup membership assumptions related to factoring. The Computer Journal, bxad056.
Added by: Jack (2023-06-07 12:27) Last edited by: Jack (2023-06-07 12:27)
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Abstract
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Stealth address is a known technique to ensure the privacy (anonymity) of a recipient participating in a certain transaction in a distributed blockchain scenario. However, most existing stealth address schemes require linear judge time and search time O (n), where n is the number of transactions of a certain block, so the only way to claim transactions for a recipient is to traverse the transaction list to find out whether an ever-arrived transaction belongs to him. To overcome this drawback, we proposed the notion of Fast Stealth Address (FSA), a novel approach that simultaneously preserves privacy and improves search efficiency of recipients. We give a generic construction of FSA scheme under subgroup membership assumption related to factoring and instantiate concrete schemes based on specific number-theoretic assumptions. Our framework mainly improves on two aspects: (i) allowing constant recognize time O (1) to judge whether a certain block contains recipient’s transactions and (ii) allowing logarithmic search time O (log n) to find out the precise transactions intended for a recipient. We formalize the security model of an FSA scheme and provide provable security analysis to ensure the security of our constructions. Besides, we implement our schemes to measure their real-world performance on several metrics and give comparison results to stealth address scheme utilized by Monero.
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