Another Look at Square Roots (and Other Less Common Operations) in Fields of Even Characteristic.

Roberto Maria Avanzi Another Look at Square Roots (and Other Less Common Operations) in Fields of Even Characteristic. 138-154 2007 conf/sacrypt/2007 Selected Areas in Cryptography http://dx.doi.org/10.1007/978-3-540-77360-3_10 db/conf/sacrypt/sacrypt2007.html#Avanzi07