Table 2 Comparison based on the number of messages and cryptographic operations

C

V

B

C

V

B

C

V

B

Messages sent

5

4

4

4

6

2

4

4

Message received

5

4

4

4

5

2

4

3

Symmetric encryption

1

3

4

1

1

HMAC

2

3

5

2

1

Hash

X+N

X

N

Messages sent

7

6

6

8

6

6

Message received

7

6

6

7

6

5

Symmetric encryption

2

4

2

2

HMAC

4

4

4

2

Hash

N+X+(I-X)

X+(I-X)

N