Admin: Created page with "A '''hash filter''' creates a hash sum from data, typically e-mail, and compares the sum against other previously defined sums. Depending on the purpose of the filter,..."

2019-03-21T04:07:52Z

Created page with "A '''hash filter''' creates a hash sum from data, typically e-mail, and compares the sum against other previously defined sums. Depending on the purpose of the filter,..."

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A '''hash filter''' creates a [[hash sum]] from data, typically [[e-mail]], and compares the sum against other previously defined sums. Depending on the purpose of the filter, the data can then be included or excluded in a [[function (computer science)|function]] based on whether it matches an existing sum.

For example, when a message is received by an e-mail server with a hash filter, the contents of the e-mail is converted into a hash sum. If this sum corresponds to the hash sum of another e-mail which has been categorized as [[e-mail spam|spam]], the received e-mail is prevented from being delivered. Spammers attempt to evade this by adding random strings to the text content and random pixel changes ("confetti") to image content (see [[image spam]]).

==See also==
* [[Bloom filter]]
* [[Hash buster]]
* [[Locality-sensitive hashing]]

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
[[Category:Cryptography]]

Hash filter - Revision history

Admin: Created page with "A '''hash filter''' creates a hash sum from data, typically e-mail, and compares the sum against other previously defined sums. Depending on the purpose of the filter,..."