Henri Gilbert Matthew J. B. Robshaw Yannick Seurin HB<sup>#</sup>: Increasing the Security and Efficiency of HB<sup>+</sup>. 361-378 2008 EUROCRYPT http://dx.doi.org/10.1007/978-3-540-78967-3_21 conf/eurocrypt/2008 db/conf/eurocrypt/eurocrypt2008.html#GilbertRS08