A.用戶(hù)用自己的私鑰對(duì)原始數(shù)據(jù)的哈希摘要進(jìn)行加密所得的數(shù)據(jù)B.用戶(hù)用公鑰對(duì)原始數(shù)據(jù)的哈希摘要進(jìn)行加密所得的數(shù)據(jù)C.用戶(hù)用自己的私鑰對(duì)已加密信息進(jìn)行再加密所得的數(shù)據(jù)D.用戶(hù)用公鑰對(duì)已加密信息進(jìn)行再加密所得的數(shù)據(jù)