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Question about ECDSA private key recovery from known k parameter

I'm trying to solve a challenge about finding ECDSA private key from known k, and I encountered a problem that I can't google, so I hope someone will help me here.

I have a signature, a Bitcoin address, a message and the k parameter used to create the signature. I wrote a solution that works with my own test cases, but it fails with the challenge in the following way: the public key that gets derived from found private key is not the same as as the public key that corresponds to the Bitcoin address. However, signing the same message with the same k produces the same signature as the challenge signature (aside from special byte appended by Bitcoin). I suspected that the problem might be with the R, but R, and tried a few different values, even though it's already supplied by Bitcoin signature format, but still failed to produce the same public key.
Update: found the R value that leads to the same public key that I can derive from my found private key. Seems like this was a part of the challenge. Still, want to know the answer to my last question, as I don't know much theory about Ecdsa.
Update 2: after getting a hint, I found the private key by using -s instead of s to calculate the private key. But I don't fully understand how it worked, I see it has something to do with ECDSA malleability, so my second question is - how it all worked?
So, my question is - what I could be doing wrong? Can different private keys produce the same signature when k and message are the same?
submitted by Satoshi_Hodler to crypto [link] [comments]

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Bitcoin (afkorting BTC) is een cryptovaluta in een globaal betaalmiddel (als systeem wordt Bitcoin met een hoofdletter geschreven, als munteenheid vaak met een kleine letter). Het is de eerste gedecentraliseerde digitale munt daar het werkt zonder centrale bank of centrale beheerder. Het netwerk is peer-to-peer en de transacties gebeuren tussen by gebruikers onderling, zonder tussenpersoon. Bitcoin. Da Wikipedia, l'enciclopedia libera. Jump to navigation Jump to search. Bitcoin software; Genere: Moneta elettronica (non in lista) Sviluppatore: Satoshi Nakamoto (creatore) Wladimir van der Laan Data prima versione: 3 gennaio 2009 Ultima versione: 0.20.0 (3 giugno 2020) Sistema operativo: Microsoft Windows Linux macOS: Linguaggio: C++: Licenza: licenza MIT (licenza libera) Sito web ... Elliptic Curve Digital Signature Algorithm or ECDSA is a cryptographic algorithm used by Bitcoin to ensure that funds can only be spent by their rightful owners.. A few concepts related to ECDSA: private key: A secret number, known only to the person that generated it.A private key is essentially a randomly generated number. Trading in bitcoin in Vietnam is still unrestricted and unregulated by law, and two largest bitcoin markets in Vietnam - VBTC and Bitcoin Vietnam are working without being restricted. In August 2017, Vietnam's prime minister has approved a plan that could see the country formally recognize bitcoin as a form of payment by the end of 2018. Bitcoin.com is a company that provides Bitcoin and Bitcoin Cash services, such as purchasing and selling these cryptocurrencies, and choosing a wallet for both. The associated website aims to be a Bitcoin-related web portal. Accordingly, it features a range of services such as news, various tools, widgets and charts as well as a store and online games casino.

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The Elliptic Curve Digital Signature Algorithm and raw transactions on Bitcoin

Bitcoin - Wikipedija, prosta enciklopedija - Vsakemu naslovu Bitcoin, ki je analogen računu v bančnem sistemu, pripada par javnega in zasebnega ključa ECDSA iz domene asimetrične kriptografije ... Bitcoin - Wikipedija, prosta enciklopedija - Vsakemu naslovu Bitcoin, ki je analogen računu v bančnem sistemu, pripada par javnega in zasebnega ključa ECDSA iz domene asimetrične kriptografije ... Oglejte si brezplačno video serijo, ki jo najdete na naslednji povezavi: http://kriptoclub.com ZANIMIVE POVEZAVE: Bitcoin price, charts, market cap, and othe... Bitcoin - Wikipedija, prosta enciklopedija - Vsakemu naslovu Bitcoin, ki je analogen računu v bančnem sistemu, pripada par javnega in zasebnega ključa ECDSA iz domene asimetrične kriptografije ... Bitcoin - Wikipedija, prosta enciklopedija - Vsakemu naslovu Bitcoin, ki je analogen računu v bančnem sistemu, pripada par javnega in zasebnega ključa ECDSA iz domene asimetrične kriptografije ...

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