呂守箴(OpenBlue) says to 網路攻防戰~資安閒聊群組
利用密碼學教學軟體模擬Vernam OTP https://www.youtube.com/watch?v=XI0t8EXMReM Hash函數SHA-1的的線上計算 https://www.youtube.com/watch?v=sSanqKAP6UI 解開BMP圖檔藏有秘密訊息的C程式(steganography) https://www.youtube.com/watch?v=29wpXAd1Un8