How to Obscure Any URL - The Diigo Meta page

• 31 Mar 15
  

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  Obscured URLs may deceive people, including end users as well as web developers, meaning safeguard mechanisms (e.g. white list of domains) would fail if they clearly get what format should be considered as valid.

  vulnerability URL browser security

  • http://www.playboy.com@3468664375/obscure.htm
  • the @ symbol can be represented by its hex code %40 to further confuse things
  • But the way this number is handled by some software often allows for a value higher than 255. The program uses only the 8 right-hand digits of the binary number, and will drop the rest if the number is too large.
  • Any number of leading zeroes can be added to any or all of the numbers in the address. For example: http://00000000316.000277.00000236.00000000067/obscure.htm

  • The dots can be omitted, and the entire hex number preceded by 0x: 0xCEBF9E37  

    And, additional arbitrary hex digits can be added to the left of the "real" number: 0x9A3F0800CEBF9E37

  3 more annotations...

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  • How to Obscure Any URL How Spammers And Scammers Hide and Confuse
• 25 Feb 05
  

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• 17 Feb 05
  

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• 05 Feb 05
  

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• 28 Dec 04
  

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• 22 Nov 04
  

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• 19 Oct 04
  

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Page Comments

• 
  Tom on 2006-07-17
  How to Obscure Any URL
  How Spammers And Scammers Hide and Confuse
• 
  Sprant Flere Imsaho Wu hanhadren Mrawhin Skell on 2006-07-31
  How to Obscure Any URL

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