sen 1: 'selected by existed standards' -> 'that have been selected by existing standards'
sen 3: 'described as' -> 'described in'
sen 5: 'since 2016 in which exTNFS was proposed' -> 'since the 2016 exTNFS attacks'; 'curves that had security levels below 128 bits' -> 'curves that have had security levels below 128 bits'
Comments from Chloe (Expert Reviewer)