By whether the same key is used for both encryption and decryption (symmetric key algorithms), or if a different key is used for each (asymmetric key algorithms). If the algorithm is symmetric, the key must be known to the recipient and sender and to no one else.
Estimated GPA Requirements. You will need very good grades in high school to get into University of Southern California. The average high school GPA of the admitted freshman class at University of Southern California was 3.73 on the 4.0 scale indicating that primarily A- students are accepted and ultimately attend. Meeting these GPA requirements is not enough to gain admission as USC is a very selective school.
The average WMU freshman has a 3.41 cumulative high school GPA on a 4-point scale and a 23 ACT composite score. However, these numbers should not be viewed as minimum requirements. Students with scores both above and below these averages are considered for admission.