#2.1 lec2 #2.2 التشفير #2.3 lec2

#3.1 lec4 #3.2 part2

#4.1 lec3.1 #4.2 lec 3.2 #4.3 تشفىر

#5.1 lap #5.2 lap2 #5.3 lap3

#6.1 puplic key #6.2 DF #6.3 EL GAMAL

#7.1 security #7.2 hash

#8.1 virus #8.2 virus2