SSL HandShake Tutorial for Beginners | Mulesoft Integration Architect MCIA [Updated 2026] - igmGuru
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What Is a SSL/TLS Handshake?
A Secure Sockets Layer (SSL) / Transport Layer Security (TLS) handshake is the process of creating a safe and secure encrypted communication channel between the client (user’s browser) and the server (web server). Thus, protecting user information and ensuring risk-free transactions by preventing an attacker (third party) from reading or changing the actual data.
SSL and its updated and more secure variant TLS are cryptographic authentication and encryption protocols. For instance, every time you visit a website, your browser and the web server will first authenticate each other and build a secure encrypted communication channel using SSL/TLS handshake.
Useful SSL/TLS Terminology
Learning some of the essential terms is a prerequisite to delve into the specifics of the SSL/TLS handshake. Here are some of them:
Cipher Suite
A cipher suite is a collection of cryptographic algorithms used to establish a secure connection between the client and server. During the SSL/TLS handshake, both the client and host computer agree upon an encryption method from the cipher suites to create keys and encrypt information.The cipher suite contains digital signature algorithms, hash functions for checking if the data in transit is modified, asymmetric encryption algorithms for the handshake, and symmetric encryption algorithm to maintain session security.
Key Exchange
TLS key exchange allows two parties to use a cryptographic algorithm by exchanging cryptographic keys. For example, a symmetric session key is generated during SSL/TLS handshake before an encrypted message is transmitted. RSA and Diffie-Hellman-Merkle are the top key exchange algorithms used.
Symmetric Encryption
Symmetric encryption encrypts and decrypts using the same (one) key. Compared to asymmetric cryptography, this is more efficient – it needs less encryption time, uses fewer resources, and can transfer large volumes of data, while also maintaining confidentiality. Cipher text is the same or smaller than the plain text.
Some of the examples of widely-used symmetric encryption include Data Encryption Standard (DES), Triple Data Encryption Standard (3DES), Advanced Encryption Standard (AES), more.
Asymmetric Encryption
Asymmetric encryption uses two keys: a public and a private key. This means a message encrypted with a public key can only be decrypted with the corresponding private key. It provides better security as the keys are never shared and allow the user to authenticate data using digital signatures. It is slower than symmetric encryption and can only be utilized for small amounts of data. Cipher text is the same or larger than plain text.
Some of the examples of widely-used asymmetric encryption include Rivest Shamir Adleman (RSA), Digital Signature Algorithm (DSA), the Diffie-Hellman exchange method, and more.
Authentication
Authentication lets each party in a communication verify that the other party is who they say they are. SSL/TLS handshake verifies the server’s credibility by comparing its public key with the digital signature issued by the SSL certificate authority, ensuring a client can trust the server’s identity.
How Does the SSL/TLS Handshake Work?
To perform secure communication, the SSL/TLS handshake involves several exchanges between the client and the server:
1. Choose a protocol (TLS) version.
2. Select a cipher suite.
3. Verify each other by exchanging and confirming digital certificates.
4. Create session keys to use symmetric encryption after the handshake is complete.