TeslaCrypt was a ransomware trojan. It is now defunct, and its master key released by the developers. A free decryption tool is available . In its early forms, TeslaCrypt targeted game-play data for specific computer games. Newer variants of the malware also affect other file types. - Refer to Wiki 圖 1-1 TeslaCrypt 勒索訊息( 圖片來源 ) 圖 1-2 TeslaCrypt 勒索訊息( 圖片來源 )