Array ( [0] => Array ( [title] => L5AR [link] => https://www.youtube.com/embed/REAZ_xW_Gg8 ) [1] => Array ( [title] => L5BR [link] => https://www.youtube.com/embed/tmh0r_tm0Ts ) [2] => Array ( [title] => L5CR [link] => https://www.youtube.com/embed/rBxgoTiLGPU ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第5講 Ch.2 Symmetric-key encryption (2)