Based on the info given below can someone create a drawn diagram with clear labelling of the key protocol

Legend:

A: Entity A B: Entity B S: Chat Server CA<>: Certificate Authority for Entity A CA<>: Certificate Authority for Entity B CA<>: Certificate Authority for Chat Server Kab: Session Key between A and B Kan: Session Key between A and S or B and S N_a: Nonce generated by A N_b: Nonce generated by B Cert_X: X's public key certificate Enc(X, Y): Encryption of Y with X's public key H(Y): Hash of Y using a secure hash algorithalgorithm Sign_X(Y): Digital signature of Y using X's private key Verify_X(Sign_X(Y)): Verification of digital signature using X's public key

Protocol:

A requests to establish a secure chat session with B through S by sending its public key certificate Cert_A and a nonce N_a to S. CIA: Enc(CA<>, Cert_A) and Enc(CA<>, N_a) using AES Authentication algorithm: RSA Integrity algorithm: SHA256 Interaction: A S: {Enc(CA<>, Cert_A), Enc(CA<>, N_a)} S verifies the authenticity of A by checking the certificate and validates the nonce. S generates a new session key Kan for the communication between A and S, and sends Enc(Cert_A, Kan) and Enc(Kan, N_b) to A. CIA: Enc(Cert_A, Kan) and Enc(Kan, N_b) using AES Authentication algorithm: RSA Integrity algorithm: SHA256 Interaction: S A: {Enc(Cert_A, Kan), Enc(Kan, N_b)} A verifies the authenticity of S by checking the certificate and validates the nonce. A generates Kab as a shared secret key for communication with B. A sends Enc(Kab, Kan) and Sign_A(Enc(Kab, Kan)) to S. CIA: Enc(Kab, Kan) using AES and Sign_A using RSA Authentication algorithm: RSA Integrity algorithm: SHA256 Interaction: A S: {Enc(Kab, Kan), Sign_A(Enc(Kab, Kan))} S verifies the authenticity of A by checking the signature and validates the nonce. S sends Enc(Kab, Cert_B) and Sign_S(Enc(Kab, Cert_B)) to B. CIA: Enc(Kab, Cert_B) using AES and Sign_S using RSA Authentication algorithm: RSA Integrity algorithm: SHA256 Interaction: S B: {Enc(Kab, Cert_B), Sign_S(Enc(Kab, Cert_B))} B verifies the authenticity of S by checking the signature and sends Sign_B(Enc(Kab, Kan)) to A to establish the freshness of communication. CIA: Sign_B(Enc(Kab, Kan)) using RSA Authentication algorithm: RSA Integrity algorithm: SHA256 Interaction: B A: {Sign_B(Enc(Kab, Kan))} A verifies the freshness of communication by validating the signature. A sends Sign_A(H(Sign_B(Enc(Kab, Kan)))) to B to establish the freshness of communication. CIA: Sign_A(H(Sign_B(Enc(Kab, Kan)))) using RSA Authentication algorithm: RSA Integrity algorithm: SHA256 Interaction: A B: {Sign_A(H(Sign_B(Enc(Kab, Kan))))}