Which of the following answers are correct about data encryptions?
1.
The cipher block chaining mode is a common method of applying data encryption to a long text message to take care of repeating patterns in the message.
2.
2DES/2 meets the security requirements for encrypting important messages.
3.
AES is an implementation of Feistel's cipher scheme.
4.
DES allows three different key lengths, namely, 128 bits, 192 bits, and 256 bits.
5.
AES operations are finite-field operations on bytes, where each byte represents a polynomial of degree 7, to allow multiplication and inverse operations on bytes.