Questions about the GIF verification code

Source: Internet
Author: User
Questions about the GIF verification code
Found many major stations such as Qq,baidu,google, do not use GIF dynamic map to do verification code, why? This should be more difficult to crack.

Do you have a good dynamic verification code, share it


------Solution--------------------
You should have asked the graphic image version

Animating a GIF to split a frame is actually a single frame
GIF color is low, inverse algorithm is easier than JPG
------Solution--------------------
http://www.phper.org.cn/?tag=GIF%E5%8A%A8%E7%94%BB+%E9%AA%8C%E8%AF%81%E7%A0%81

This should be able to meet the requirements, but in fact, as the above said, GIF more easily than jpg to crack some, the characters stick together jpg static distortion verification code, crack more difficult

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