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La primavera la sangre altera

By | 19 March, 2017 | 1 comment

Sorry, this entry is only available in European Spanish.

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  1. La otra says:

    To hide the non-spam text used to sneak the message by the filter from the recipient of the message, the spammer
    uses HTML font tags to make it the same color as the background of the message. The spam text itself is set to
    display in a color that contrasts with the message background.
    If a filter is smart enough to identify this trick, it can immediately classify as spam a message that contains a large
    amount of text that is the same color as the background. Overly simplistic Bayesian filters can potentially be
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    Several advanced versions of this technique are currently being used by spammers in an attempt to get around
    smart filters that recognize the original trick. One variation is to display the non-spam text in a color that is very
    close to the background color, but not exactly the same. This tends to work very well, since most modern
    computer screens can display upwards of 16 million colors while the human eye can only distinguish
    approximately 10,000 colors. To catch this variation, filters have to contain a fuzzy logic model that can mimic
    the human eye’s response to color.
    9 Common Spammer Tricks
    Another popular variation is to display the non-spam text in the same color as the spam text, but in a miniscule
    font size. Several thousand words of non-spam text can be condensed into a couple inches of screen space if
    they’re displayed in a 2 point font size.
    HTML Abuse
    Various HTML tags can be abused to hide text from a user while making sure a Bayesian filter sees it. Some
    common examples are:
    • Placing random words in the tag of an HTML message. Most email clients don’t display the
    contents of this tag.
    • Placing a paragraph of random text or text from a news site into the VALUE attribute of a hidden HTML
    form field.
    • Using a tag to hide large blocks of random text.

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