The Chain & Sum Primitive and Its Applications to MACs and Stream Ciphers

  title={The Chain & Sum Primitive and Its Applications to MACs and Stream Ciphers},
  author={Mariusz H. Jakubowski and Ramarathnam Venkatesan},
We present a new scheme called universal block chaining with sum (or chain & sum primitive (C&S) for short), and show its application to the problem of combined encryption and authentication of data. The primitive is a weak CBC-type encryption along with a summing step, and can be used as a front end to stream ciphers to encrypt pages or blocks of data (e.g., in an encrypted le system or in a video stream). Under standard assumptions, the resulting encryption scheme provably acts as a random… CONTINUE READING
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