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.