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Client Puzzle Protocol (CPP)

30 Oct 2012

Client Puzzle Protocol (CPP) is a proof-of-concept, in the late 1990s and early 2000s, to defend against denial-of-service (DoS) attacks.

Clients connecting to a server need to solve a mathematical puzzle correctly before a connection is established. Although the puzzle requires negligible computation cost from the client end, it is able to slow down simultaneously establishment of large number of connections.

 

A simple but brilliant idea it may seems, it is not widely adopted as it requires the modification of the underlying transport protocol (i.e. TCP).

 

References
  • Client Puzzle Protocol, Wikipedia.

  • Client Puzzle: A Cryptographic Countermeasure Against Connection Depletion Attacks, Ari Juels and John Brainard.

  • RSA Laboratories Unveils Innovative Countermeasure To Recent “Denial of Service” Hacker Attacks, RSA Lab.

     

     

     

     

     

     

     

     

     

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