Robert P. McEvoy Michael Tunstall Colin C. Murphy William P. Marnane Differential Power Analysis of HMAC Based on SHA-2, and Countermeasures. 317-332 2007 conf/wisa/2007 WISA http://dx.doi.org/10.1007/978-3-540-77535-5_23 db/conf/wisa/wisa2007.html#McEvoyTMM07