ezeze5000
6th August 2004, 04:11 AM
I thought this might be useful to Fedora users.
DESCRIPTION
Hashcash is a denial-of-service counter measure tool. It's main current
use is to help hashcash users avoid losing email due to content based
and blacklist based anti-spam systems.
The hashcash tool allows you to create hashcash stamps to attach to
emails you send, and to verify hashcash stamps attached to emails you
receive. Email senders attach hashcash stamps with the X-Hashcash:
header. Vendors and authors of anti-spam tools are encouraged to exempt
mail sent with hashcash from their blacklists and content based
filtering rules.
A hashcash stamp constitutes a proof-of-work which takes a
parameterizable amount of work to compute for the sender. The recipient
can verify received stamps efficiently. This package also includes a
sha1 implementation which behaves somewhat like md5sum, but with SHA1.
The hashcash proof-of-work function is to compute partial hash
collisions (the SHA1 hash function is used). By choosing the number of
bits of collision, the work required to compute a collision can be made
arbitrarily expensive -- from fractions of a second to minutes or hours.
The verification is efficient requiring the same small cost whatever the
collision size.
For more detailed discussion of other applications hashcash has been
used for see http://www.hashcash.org/
DESCRIPTION
Hashcash is a denial-of-service counter measure tool. It's main current
use is to help hashcash users avoid losing email due to content based
and blacklist based anti-spam systems.
The hashcash tool allows you to create hashcash stamps to attach to
emails you send, and to verify hashcash stamps attached to emails you
receive. Email senders attach hashcash stamps with the X-Hashcash:
header. Vendors and authors of anti-spam tools are encouraged to exempt
mail sent with hashcash from their blacklists and content based
filtering rules.
A hashcash stamp constitutes a proof-of-work which takes a
parameterizable amount of work to compute for the sender. The recipient
can verify received stamps efficiently. This package also includes a
sha1 implementation which behaves somewhat like md5sum, but with SHA1.
The hashcash proof-of-work function is to compute partial hash
collisions (the SHA1 hash function is used). By choosing the number of
bits of collision, the work required to compute a collision can be made
arbitrarily expensive -- from fractions of a second to minutes or hours.
The verification is efficient requiring the same small cost whatever the
collision size.
For more detailed discussion of other applications hashcash has been
used for see http://www.hashcash.org/
