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 Fall 2014 Freshman class of approximately 3,000 students earned admission to the university with an average SAT score of 1191 (reading and math only), ACT score of 27, and high school GPA of 4.00. 51 percent of the members of the incoming class graduated in the top 20 percent of their high school class.