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root |
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%include "std.mgp" |
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%%default 1 bimage "gtk/gtk-window.jpg" 1024x768, center |
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%page |
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root |
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%charset "iso8859-1" |
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root |
1.1 |
%%bimage "gtk/screenshot.jpg" 1600x1200 |
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Digest::Hashcash |
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%pause |
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Erzeugung sehr langsam |
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%pause |
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Prüfung sehr schnell |
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%pause |
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Anti-SPAM |
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%pause |
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Rate-Limiting von Resourcen |
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%page |
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Hashcash-Tokens |
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%font "t5" |
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0:040627133051:marc@gtk.org:lUoUt=;& |
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%pause |
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V: Datum : Nutzlast : Digest |
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%pause |
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printf '0:040627133051:marc@gtk.org:lUoUt=;&' |
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| sha1sum |
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%pause |
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000000e1089a7f9d5fae1304ecbcb59b4ca640de |
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%page |
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Perl |
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%font "t5" |
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use Digest::Hashcash; |
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%pause |
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$secs = estimate_time $size; |
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$size = estimate_size $time[, $min]; |
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%pause |
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$cipher = new Digest::Hashcash ...; |
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%pause |
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print $cipher->hash ('marc@gtk.org', size => 24); |
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%pause |
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$ok = $cipher->verify ($token); |
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$bits = $cipher->verify ($token, collisions => 0); |
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%pause |
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$time = $cipher->timestamp ($token); |
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%pause |
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$data = $cipher->resource ($token); |
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