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You will implement a simplified version of the TLS/SSL protocol in this assignment. Write (Java or C/C++) UDP programs allowing two parties to mutually authenticate each other and establish a secure communication channel. For simplicity, let us call the programs “Host” and “Client”, which are executed by Alice and Bob, respectively. Alice and Bob share a common password PW, which contains 6 alphanumeric characters. Alice also has a public and privacy key pair (pk, sk) for the RSA encryption scheme. They want to establish a secure communication channel that can provide data confidentiality and integrity. This will be done via the following steps: (1) perform a mutual authentication and key exchange protocol; and (2) use the shared session key derived from the first step to secure the real communication. Step 1 is done via the following mutual authentication and key exchange protocol: 1: A  B: pk 2: B  A: C1 = PKE pk(RK), C2 = SKERK(“Bob”||PW) 3: Alice decrypts C1 using sk to get RK, and then decrypt C2 to get “Bob”||PW. Alice checks PW and accepts the connection if and only if the PW is correct. Alice sends either “Successful” or “Unsuccessful” to Bob to indicate whether the connection is successful or not. In the above protocol, || denotes the string concatenation, PKE denotes the RSA encryption and SKE denotes the RC4 stream cipher. RK is a random value selected from the message space of the PKE. Alice and Bob then compute the shared session key as K = H(RK||PW) where H denotes the SHA-1 hash algorithm. After establishing the session key, step 2 is achieved as follows: 1. whenever Alice wants to send a message M to Bob, Alice first computes h = H(K||M||K), and then computes C = SKEK(M||h) and sends C to Bob; 2. upon receiving a ciphertext C, Bob first runs the decryption algorithm to obtain M||h. After that, Bob computes h’ = H(K||M||K) and checks if h = h’. If the equation holds, then Bob accepts M; otherwise, Bob rejects the ciphertext; 3. the same operations are performed when Bob sends a message to Alice.