McDonald, C., Hawkes, P., and J. Pieprzyk. <a href="http://eurocrypt2009rump.cr.yp.to/837a0a8086fa6ca714249409ddfae43d.pdf"><cite>SHA-1 collisions now 2<sup>52</sup> </cite></a>, EuroCrypt 2009 Rump session. URL: <a href="http://eurocrypt2009rump.cr.yp.to/837a0a8086fa6ca714249409ddfae43d.pdf">http://eurocrypt2009rump.cr.yp.to/837a0a8086fa6ca714249409ddfae43d.pdf</a>