RSAL, a new digital signature scheme that may be quite old
Posted by SDLerner in Uncategorized on December 15, 2013
Playing with RSA digital signatures I realized that the same system can be used a bit differently and achieve the same security level (as far as I see). I haven’t read about this method before and it’s near impossible to google for a math formula. So this may be a very old broken digital signature […]
P2PTradeX revisted
Posted by SDLerner in Uncategorized on December 11, 2013
I came up with an attack on my P2PTradeX protocol, which, in most cases, would thwart severely its utility. Let’s first review the protocol. A first party issues a conditional transaction in a block chain X, which contains a contract. The contract requests the the other party to provide a proof that a payment has […]
Refutation to Ron/Shamir paper on DPR/Satoshi link
Posted by SDLerner in Uncategorized on November 26, 2013
As almost any other Bitcoiner I read the recently published paper authored by Ron Dorit Ron and Adi Shamir that suggests a link between Satoshi and the Dread Pirate Robets (DPR), the Silk Road black market operator. The paper states: “The Bitcoin community believes [9] that the vast majority of the early mining operations were […]
A mistery trip to the origin of Bitcoin, Ekoparty 2013 talk (Spanish)
Posted by SDLerner in Uncategorized on October 31, 2013
For all who where unable to attend to the formidable Ekoparty Security conference, the video of my talk has been published. Both slides and video are in Spanish. Video (45 minutes) Slides (31 slides) Hope you enjoy it! (slides have a couple of images grabbed from the web. I apologize to the (unknown) […]
A disturbing idea: BitBanknotes
Posted by SDLerner in Uncategorized on October 9, 2013
Prior the hack of bitcointalk.org, I received a personal message from user “btcusr” of bitcointalk asking me to take a look a thread he had started. Soon afterwards the site went down for maintenance, so I was unable to take a look. Today I did, and for my surprise I found one of those powerful […]
Satoshi’s Machine: One Mystery is solved and another one opens
Posted by SDLerner in Uncategorized on September 4, 2013
When I was thinking about all the ideas that people posted in order to solve the mystery of the Satoshi LSB nonce, I tried to match the new explanations, such as the one given by Eyal0, with previous evidence. One of the mysteries about Satoshi mining hardware I originally posted is that it appears that […]
A new mystery about Satoshi hidden in the Bitcoin block-chain
Posted by SDLerner in Uncategorized on September 3, 2013
Some time ago, I received an e-mail from my friend Timo Hanke. If you don’t know Timo, then you should, because he is, apart from a respected mathematician and Bitcoin enthusiast, an excellent person. The e-mail suggested that I looked into the nonce field to see if I could find out the endianess of Satoshi’s […]
Can financial privacy coexist with regulation?
Posted by SDLerner in Uncategorized on July 30, 2013
I’m not an economist nor an IRS employee, but I know one thing: the day an anonymous cryptocoin (such as ZeroCoin or AppeCoin) becomes widespread, governments won’t stand idly by. Something is obvious: governments agencies want the money flow to be as clear as possible. They say it’s required to track terrorism financing, tax evasion, […]
Buggy CVE-2013-4627 patch, open new vectors of attack
Posted by SDLerner in Uncategorized on July 18, 2013
Secure coding is hard. But in Bitcoin, secure coding also means understanding every little detail of the undocumented (or code-documented) rules that Satoshi the great has brought to us mortals. CVE-2013-4627 patches a DoS vulnerability discovered by Peter Todd. The vulnerability is easy to spot once you read the code after the patch was applied. […]
The Bitcoin Eternal Choice for the Dark Side Attack (ECDSA)
Posted by SDLerner in Uncategorized on June 26, 2013
Warning: This post is a mere speculation. There are many unknowns that may change the ending of this story, but nevertheless, an attack like this, that tries to divide the Bitcoin community, undermining the moral of each user, sounds quite probable to me. But I love Bitcoin, I’m optimistic and I wish Bitcoin a great future. […]
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