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from the spammers-should-be-{insert-punishment-here} dept.
Peter N. M. Hansteen asks the question, "Does Your Email Provider Know What A "Joejob" Is?" in his blog and provides some data and discussion. He provides anecdotal evidence which seems to indicate that Google and possibly other mail service providers are either quite ignorant of history when it comes to email and spam, or are applying unsavory tactics to capture market dominance.
[Ed Note: I had to look up "joe job" to find out what it is. According to wikipedia:
A joe job is a spamming technique that sends out unsolicited e-mails using spoofed sender data. Early joe jobs aimed at tarnishing the reputation of the apparent sender or inducing the recipients to take action against them (see also e-mail spoofing), but they are now typically used by commercial spammers to conceal the true origin of their messages.
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(Score: 1) by FrankL on Tuesday April 26 2016, @03:21AM
another user (stormwyrm) just showed that 768-bit RSA was factored in 2009.
You are implying that that would have cost more than $ 75 x 2^256 = 8.6 * 10^78 USD, disregarding the higher cost of computing resources in 2009.
So the conclusion would then be that either 512-bit RSA can be factored much cheaper than 75 USD (maybe a few dollar cents)....
OR.... that factorization does NOT scale the way you propose!