Comments on: The Sad State of Hashcash https://pthree.org/2011/03/03/the-sad-state-of-hashcash/ Linux. GNU. Freedom. Fri, 25 May 2018 03:28:18 +0000 hourly 1 https://wordpress.org/?v=5.0-alpha-43307 By: Penny Proofofwork https://pthree.org/2011/03/03/the-sad-state-of-hashcash/#comment-126804 Sat, 15 Jun 2013 15:25:25 +0000 http://pthree.org/?p=1755#comment-126804 Penny Post works fine. I use Thunderbird 17.0.6 and PP works fine. A new maintainer has taken over the code and the community of this extension have made it work for versions of TB that work today.
For true credits go search in the commits who actually made it work.

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By: Links 6/3/2011: Fedora 16 Codenames, Android Grows in Tablet Market | Techrights https://pthree.org/2011/03/03/the-sad-state-of-hashcash/#comment-115487 Sun, 06 Mar 2011 07:20:00 +0000 http://pthree.org/?p=1755#comment-115487 [...] The Sad State of Hashcash So today, I received an email from one of the readers of this blog. He wanted to get into OpenPGP with his email, and asked if I could help him get started with some tutorials, how-tos, etc. I was flattered that he valued my opinion. So, I responded to each of his questions and discussion points the best I could. However, during the reply, I reminded myself of Hashcash. [...]

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By: Aaron https://pthree.org/2011/03/03/the-sad-state-of-hashcash/#comment-115484 Fri, 04 Mar 2011 13:34:54 +0000 http://pthree.org/?p=1755#comment-115484 @Yann. No, for SpammAssassin, it only needs to run sha1sum on the token that is found in the mail, not calculate a token. Doing the verification takes milliseconds at most. And the point of hashcash is to prevent the spammers from using it, because by design, it's meant to be slow. If spammers did start using hashcash, you would notice the volume of spam reaching your inbox drop my many, many orders of magnitude. It's just too infeasible for them to take advantage of if they wish to support their business sending out millions and millions of spam mails per day.

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By: Niklas Schönberg https://pthree.org/2011/03/03/the-sad-state-of-hashcash/#comment-115482 Fri, 04 Mar 2011 12:14:39 +0000 http://pthree.org/?p=1755#comment-115482 You don't have to do the computations to validate. As the post say, there is one valid hash in 2^20 so the sender needs to try them until he gets one correct, so on average 2^20/2 tries, but to validate you just need one calculation.

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By: Yann https://pthree.org/2011/03/03/the-sad-state-of-hashcash/#comment-115481 Fri, 04 Mar 2011 10:13:21 +0000 http://pthree.org/?p=1755#comment-115481 Aaron, so if my spamassassin wants to analyze the content of the mails to see if they are spam, will it have to do that expensive computing on every incoming email too? Or will it assume that every email using this is not a spam - in which case it might be worth for spammers to use hashcash, it if's a guarantee that it'll reach the target's inbox?

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