Attack on the GridCode one-time password

  title={Attack on the GridCode one-time password},
  author={Ian Molloy and Ninghui Li},
SyferLock presents a one-time password system, GridCode, that allows an unaided human to authenticate, reducing the cost of deployment. The one-time password system is a human computable challenge-response protocol which they claim defends against key-logging, replay, and brute force attacks, among others. We evaluate the security of the Grid-Code one-time password system and challenge these claims. We identify weak preimage resistance and character independence as key weaknesses of the… CONTINUE READING


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