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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: 0) by Anonymous Coward on Tuesday April 26 2016, @07:57AM
Your calculation is utterly bogus. You've presumed the cost to factor is exponential - to be precise, O(N) or O(2^D) where D=lg(N) is the size of the number N to be factored.
That hasn't been the case *ever*. Even trial factoring is quicker than that, as you only need to trial divide by primes up to sqrt(N), so the cost of that is o(sqrt(N)/ln(N)). GNFS, like QS before it, is subexponential, and by the time you're at numbers of this size, the difference is immense.
Here's a little bit of verification that your calculation is bogus - if 512 bit cost $75, then factoring 500 bits should cost 2c. Does it?
FatPhil