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November 28, 2023

Security 4 min read

SSH vs. SSL: Understanding Key Differences 



In an age where digital security takes centre stage, the quest to protect your data is unceasing. Beyond mere encryption, the choice of the right keys becomes paramount to safeguarding valuable information. This brings us to SSH and SSL, two protocols in the domain of secure data transmission. They function as sentinels of privacy, each fortified with its distinct shield and strategic purpose. 

In this blog, we'll explore the fundamental differences between SSH (Secure Shell) and SSL (Secure Sockets Layer). 


What is SSH? 


SSH, which stands for Secure Shell, is a network protocol that provides secure access to remote systems over an unsecured network. It offers encrypted connections for tasks like remote administration, file transfers, and even tunnelling, making it a popular choice for network administrators.


What do you use SSH for? 


SSH is primarily used for securely accessing and managing remote servers and devices. It ensures data confidentiality and integrity during interactions with remote systems, protecting against eavesdropping and tampering. 


Secure access:

SSH was specifically developed to address the security concerns associated with remote access to computers and servers. In a world where networks are often untrusted, SSH provides a secure pathway for users to access and manage systems located remotely. 



One of the core features of SSH is its ability to encrypt data exchanged between a client and a server. This encryption ensures that any information, such as login credentials, files, and commands, remains confidential and cannot be intercepted by malicious actors. This is particularly important when accessing sensitive data or critical systems. 


Remote administration:

SSH is widely used by network administrators to perform remote system administration tasks. Through SSH, administrators can securely log in to remote servers and execute commands as if they were physically present at the server's location. This capability is invaluable for managing a wide range of systems without having to be physically on-site. 


File transfers:

In addition to remote administration, SSH also supports secure file transfers. This is typically achieved using the Secure Copy Protocol (SCP) or SFTP (SSH File Transfer Protocol). With these features, files can be transferred between the local and remote systems securely and efficiently. 



SSH allows for tunnelling, which means it can create secure channels for specific network services. This capability is useful when you want to secure other network protocols, such as HTTP or database connections, by routing them through an encrypted SSH tunnel. 


What is SSL? 


SSL, or Secure Sockets Layer, is a cryptographic protocol that secures data transmission over a network. Originally developed for securing web communications, SSL has evolved into Transport Layer Security (TLS), which is the modern standard for secure internet communication. 


What do you use SSL for? 


SSL/TLS is widely employed to secure internet transactions, especially on websites. It encrypts data during online activities such as e-commerce transactions, login sessions, and form submissions. SSL Certificates are crucial for establishing secure, trustworthy connections between web browsers and servers. 


Securing website communications:

One of the most common uses of SSL is securing data transmitted between web browsers and web servers. SSL Certificates enable the "https://" in website URLs and display a padlock icon, indicating a secure connection. This is vital for safeguarding sensitive data like login credentials, credit card information, and personal details in e-commerce, online banking, and other web applications. 


Email security:

SSL/TLS is employed to secure email communication. It ensures that email messages sent between email clients and servers are encrypted, preventing unauthorized access to the content of emails. This is particularly important for sensitive or confidential email exchanges. 


Secure file transfers:

SSL is used in protocols like FTPS (FTP Secure) and SFTP (SSH File Transfer Protocol) to secure file transfers. These are essential for industries where file security is critical, such as healthcare and financial services. 


Virtual Private Networks (VPNs):

SSL VPNs create a secure, encrypted connection for remote users to access corporate networks. This ensures that data exchanged between the remote user and the network is protected from eavesdropping. 


Online authentication:

SSL is used to secure the authentication process. For instance, it ensures the safe transmission of login credentials during the login process to an online account. This protects against unauthorized access and data theft. 


Data encryption in transit:

Any data transferred between two endpoints, whether it's between servers or from a server to a mobile app, can be secured using SSL. This guarantees that the data remains confidential and unaltered during transit. 


Internet of Things (IoT) security:

In the IoT landscape, SSL ensures secure communication between connected devices. It's crucial for protecting sensitive data in smart homes, industrial IoT, and other applications. 


Protecting API calls:

APIs (Application Programming Interfaces) are used extensively to enable interactions between software applications. SSL ensures that data transmitted via APIs is secure and private, preventing unauthorized access to sensitive data. 


SSL vs. SSH: What is the difference? 


Aspect  SSL (Secure Sockets Layer)  SSH (Secure Shell) 
Purpose  Provides secure communication for data transfer over the internet, typically used for securing websites and web applications.  Primarily used for secure remote access to servers and for secure command-line communication. 
Protocol  Uses the SSL/TLS (Transport Layer Security) protocol for data encryption and secure communication.  Utilizes its own SSH protocol for secure data transfer and remote access. 
Encryption  Encrypts data in transit, ensuring that data exchanged between the client and server is secure from eavesdropping.  Encrypts both data and authentication information, ensuring the confidentiality and integrity of the communication. 
Authentication  Often involves server authentication, where the server presents a certificate to prove its identity.  Employs strong authentication methods, including password-based, key-based, or multi-factor authentication. 
Use cases  Used for securing web traffic, such as online banking, e-commerce, and any data transmission through HTTPS.  Mainly used for securely connecting to remote servers and managing them, commonly in a command-line environment. 
Port  Typically operates on port 443 for HTTPS.  Typically operates on port 22 for SSH 
Key management  Requires SSL Certificates, with key pairs consisting of a public key and a private key.  Uses SSH keys (key pairs) for user authentication and host verification. 
Typical applications  Web browsers, email clients, and any application that requires secure data transfer over the internet.  System administrators, developers, and anyone needing secure remote access to servers or network devices. 
Extensibility  Can be used with various cryptographic algorithms and can secure other services beyond HTTP.  Can be used for a wide range of secure communication and automation beyond remote access, such as file transfer and tunneling. 


Both SSH and SSL/TLS play crucial roles in securing data transmission, but they are designed for different purposes. SSH is tailored for remote system access, while SSL/TLS ensures secure internet communication. Understanding these distinctions is essential for implementing the right security protocols in various contexts, safeguarding sensitive information in an interconnected world. 

If you have any queries or suggestions, feel free to send an email to [email protected]

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