3DES使用的是() A.加密—加密—解密B.加密—解密—加密C.解密—加密—解密D.加密—加密—加密
3DES使用的是()
A.加密—加密—解密
B.加密—解密—加密
C.解密—加密—解密
D.加密—加密—加密
相关考题：
● 下面安全算法中，属于加密算法的是 （54） ，属于报文摘要算法的是 （55） 。（54）A. MD5 和3DES B. MD5和SHA1 C. DES和SHA1 D. DES和3DES（55）A. MD5 和3DES B. MD5和SHA1 C. DES和SHA1 D. DES和3DES
VPN中的数据加密所使用的方法有DES和3DES，其中3DES是执行三次DES算法，图3-3所示的是3DES加密过程。若用E和D分别表示执行加密和解密算法，则图3-3方框中分别按顺序填写(9)、(10)和(11)。
Select the two correctstatements from the list below that describe DES and 3DES： （）A、 3DES is muchmore secure than DES.B、 Both DES and 3DES are stream ciphers.C、 DES uses 64 bitkeys， although the effective key lengthis only 56bits.D、 The decryption operation for both DES and 3DES is the same as the encryption operation.E、 DES can only be used for encryption， whereas 3DES can also be used for authentication.
Which of the following statements are true？ （）A、 RC4 is a stream cipherB、 Stream ciphers require paddingC、 AES is a block cipherD、 DES and 3DES are stream ciphersE、 AES is a stream cipherF、 AES， DES， and 3DES can be used as HMAC algorithms
多选题Which of the following statements are true？ （）ARC4 is a stream cipherBStream ciphers require paddingCAES is a block cipherDDES and 3DES are stream ciphersEAES is a stream cipherFAES， DES， and 3DES can be used as HMAC algorithms
多选题Select the two correctstatements from the list below that describe DES and 3DES： （）A3DES is muchmore secure than DES.BBoth DES and 3DES are stream ciphers.CDES uses 64 bitkeys， although the effective key lengthis only 56bits.DThe decryption operation for both DES and 3DES is the same as the encryption operation.EDES can only be used for encryption， whereas 3DES can also be used for authentication.