Transport Layer Security (TLS) Handshake Last Updated : 23 Jul, 2020 Comments Improve Suggest changes Like Article Like Report TLS is a data privacy and security protocol implemented for secure communication over internet. It usually encrypts communication between server and clients. TLS is a successor to Secure Socket Layer (SSL) protocol. SSL v3.0 and TLS v1.0 were very similar but it was replaced with TLS. You can also refer to Transport Layer Security (TLS). A Transport Layer Security (TLS) connection is established via handshake. TLS Handshake in action : Figure - TLS Handshake With a TLS enabled service, a sender sends a ClientHello (as referred in protocol). This includes information about Client. Then server responds with ServerHello message (selecting highest version of TLS supported by Client) and then chooses a cipher suite from list in ClientHello message. The server also transmits its Digital certificate and a final ServerHelloDone message. Client validates certificate. Client then sends ClientKeyExchange message. Here client chooses a key exchange mechanism to securely establish a shared secret with server. Client also needs to send ChangeCipherSpec indicating that it is switching to secure communication now, which is finally followed by Finished message for indicating a successful handshake. Server replies with ChangeCipherSpec and an encrypted Finished message once shared secret is received. Session key is Shared Symmetric Encryption Key used in TLS sessions to encrypt data being sent back and forth. Comment More infoAdvertise with us Next Article Transport Layer Security (TLS) Handshake O om_mishra Follow Improve Article Tags : Computer Networks Similar Reads Transport Layer Security (TLS) Transport Layer Securities (TLS) are designed to provide security at the transport layer. TLS was derived from a security protocol called Secure Socket Layer (SSL). TLS ensures that no third party may eavesdrop or tampers with any message. There are several benefits of TLS: Encryption: TLS/SSL can h 4 min read Transport Layer in OSI Model The transport layer, or layer 4 of the OSI model, controls network traffic between hosts and end systems to guarantee full data flows. It is positioned between the network and session layers in the OSI paradigm. The data packets must be taken and sent to the appropriate machine by the network layer. 5 min read Transport Layer Protocols The transport layer is the fourth layer in the OSI model and the second layer in the TCP/IP model. The transport layer provides with end to end connection between the source and the destination and reliable delivery of the services. Therefore transport layer is known as the end-to-end layer. The tra 9 min read TCP and UDP in Transport Layer The Transport Layer in the network architecture is responsible for end-to-end communication between applications. In this layer, TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are the two main protocols that handle the responsibility of moving data between applications. TCP foc 8 min read What is SSL/TLS Handshake? The network is important for office, home, and business networks. The problem is at the utmost places wireless communication is used or we can say the wireless network is used which is effortlessly hackable and the router can be freely exploited if not secured rightly. So there's a need for security 6 min read Like