Double encoding is an attack technique used to bypass security mechanisms which only decode data once.
It can be used to masquerade a directory traversal attack or a cross-site scripting (XSS) attack. Most double encoding works by encoding the character[s] you what to put in, so that it really decrypts the message to input illegal characters.
- "Double Encoding - OWASP". owasp.org. Retrieved 2015-08-28.
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