یک ﻃﺮﺡ ﻣﺨﻠﻮﻁ کرﺩﻥ ﺟﺪید ﺑﺮﺍی ﺑﻬﺒﻮﺩ ﺣﺮیم ﺧﺼﻮصی ﺩﺭ ﺗﺮﺍکنش ﻫﺎی ﺭﻣﺰ ﺍﺭﺯ بیت کوین

ﺗﺮﺍکنش ﻫﺎی ﻣﺎلی ﺩﺭ ﺭﻣﺰﺍﺭﺯ بیت کوین ﺩﺭ یک پایگاه ﺩﺍﺩﻩ ﺗﻮﺯیعی ﺑﻪ ﻧﺎﻡ ﺯﻧﺠﯿﺮﻩ ﺑﻠﻮکی ﺫﺧﯿﺮﻩ میﺷﻮﻧﺪ. کلیه ﺗﺮﺍکنشﻫﺎ ﺑﺎ ﻫﺪﻑ ﺷﻔﺎﻓﯿﺖ ﻭ ﺍمکاﻥ ﺑﺮﺭسی ﺻﺤﺖ ﺑﻪ ﺻﻮﺭﺕ ﻋﻤﻮمی ﺑﺮﺍی کلیه گرﻩﻫﺎی شبکه ﺩﺭ ﺩﺳﺘﺮﺱﺍﻧﺪ. ﺍﻣﺎ ﺍین ﻭیژگی ﺷﻔﺎﻓﯿﺖ ﺯﻧﺠﯿﺮﻩ ﺑﻠﻮکی ﺑﺎ ﺑﻬﺮﻩﺑﺮﺩﺍﺭی ﺗﻮﺳﻂ تکنیکﻫﺎی ﺗﺠﺰیه ﻭ ﺗﺤﻠﯿﻞ ﺗﺮﺍکنشﻫﺎ، میﺗﻮﺍﻧﺪ ﻣﻨﺠﺮ ﺑﻪ ﻧﻘﺾ ﺣﺮیم ﺧﺼﻮصی کاﺭﺑﺮﺍﻥ ﻭ ﻓﺎﺵ ﺷﺪﻥ ﻫﻮیت ﺁﻧﻬﺎ ﺷﻮﺩ. تکنیکﻫﺎی مختلفی ﻣﺎﻧﻨﺪ ﺭﻭﺵ ﻣﺨﻠﻮﻁ کﺮﺩﻥ ﺗﺮﺍکنشﻫﺎ یا ﻣﺒﺎﺩﻟﻪ ﻋﺎﺩﻻﻧﻪ ﺑﺎ ﻫﺪﻑ ﺍﺭﺗﻘﺎی ﺣﺮیم ﺧﺼﻮصی ﺩﺭ ﺗﺮﺍکنشﻫﺎی بیتکوین ﺗﻮﺳﻂ ﻣﺤﻘﻘﯿﻦ ﺍﺭﺍﺋﻪ ﺷﺪﻩ ﺍﺳﺖ. ﺩﺭ ﺍین ﻣﻘﺎﻟﻪ ﻣﺎ ﺑﻪ ﺍﺭﺍﺋﻪ یک ﻃﺮﺡ ﻣﺨﻠﻮﻁ کرﺩﻥ ﺟﺪید می پردازیم که ﺑﺮخی ﺍﺯ ﻧﻘﺎﻁ ﺿﻌﻒ ﺭﻭﺵﻫﺎی پیشین ﺭﺍ ﺭﻓﻊ کرﺩﻩ ﺍﺳﺖ. ﻣﺸﺨﺼﺎً  ﺩﺭ ﻃﺮﺡ ﺍﺭﺍﺋﻪ ﺷﺪﻩ کاﺭﺑﺮﺍﻥ میﺗﻮﺍﻧﻨﺪ ﺩﺭ ﻫﺮ ﺩﻭﺭ ﺍﺯ ﺍﺟﺮﺍی پروتکل ﻣﻘﺎﺩیر ﻣﺘﻔﺎﻭتی ﺍﺯ بیت کوین ﺭﺍ ﻣﺨﻠﻮﻁ کنند که ﻣﻨﺠﺮ ﺑﻪ ﺩﺳﺘﯿﺎبی ﺑﻪ ﻧﺘﯿﺠﻪ ﺩﺭ ﺯﻣﺎﻥ کوﺗﺎﻩﺗﺮ ﻭ ﺑﺎ ﻫﺰینه کمتر میﺷﻮﺩ. همچنین ﺍین ﻃﺮﺡ ﻣﻘﺎﻭﻣﺖ ﺑﺎﻻﺗﺮی ﻧﺴﺒﺖ ﺑﻪ ﺣﻤﻼﺕ ﺍنکار سرویس ﺗﻮﺳﻂ کاﺭﺑﺮﺍﻥ ﺑﺪﺧﻮﺍﻩ ﺩﺍﺭﺩ.

a new mixing scheme to improve privacy in bitcoin cryptocurrency transactions

financial transactions in bitcoin are stored in a distributed database called the block chain. all transactions are publicly available for all network nodes with the aim of transparency and the possibility of verifying the correctness. but this blockchain transparency feature, exploited by transaction analysis techniques, can lead to the violation of users’ privacy and the disclosure of their identities. researchers have proposed various techniques such as transaction mixing or fair exchange with the aim of improving privacy in bitcoin transactions. in this paper, we present a new mixing scheme that overcomes some of the weaknesses of previous schemes. obviously, in the proposed scheme, users can mix different amounts of bitcoin in each round of the protocol implementation, which leads to achieving the result in a shorter time and at a lower cost. also, this scheme is more resistant to denial of service attacks by malicious users.