1.古典密碼學
1-1.簡介
密碼學是一門研究如何保護信息安全的學科,主要包含加密技術、解密技術、訊息驗證及金鑰管理等領域。密碼學的目標是確保機密性、完整性、身份驗證和不可否認性。
1-2凱薩密碼
將字母一固定為依加密
優點簡單易實作:只需固定位移量即可加密
運算速度快:加密和解密只需進行位移計算
缺點
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