An OAEP Variant With a Tight Security Proof

  title={An OAEP Variant With a Tight Security Proof},
  author={Jakob Jonsson},
  journal={IACR Cryptology ePrint Archive},
We introduce the OAEP encoding method, which is an adaptation of the OAEP encoding method, replacing the last step of the encoding operation with an application of a block cipher such as AES. We demonstrate that if f is a one-way trapdoor function that is hard to invert, then OAEP combined with f is secure against an INDCCA2 adversary in the random oracle model. Moreover, the security reduction is tight; an adversary against f -OAEP can be extended to an f -inverter with a running time linear… CONTINUE READING

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