What is a VPN? A Virtual Private Network (VPN) allows you to create a secure virtual tunnel through the Internet to another network or device.

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If you access the Internet from this virtual tunnel, it is difficult for anyone – including your ISP – to snoop on your browsing activities. VPNs also help you disguise your location anywhere in the world and unlock geographically restricted services. A VPN protects the confidentiality (data remains secret) and integrity (data remains unaltered) of messages as it travels over the public Internet.

Establishing one of these secure connections is relatively easy. The user first connects to the internet through an ISP and then initiates a VPN connection with the VPN server using a client (locally installed) software. The VPN server fetches the requested web pages and returns to the user via the secure tunnel; thus, keeping the user data secure and private over the Internet. How does VPN Encryption Work? The VPN protocol is an agreed set of rules for data transmission and encryption. Most VPN providers give users the option to choose from several VPN protocols.

Some of the most used protocols include: Point to Point Tunnelling Protocol (PPTP), Layer Two Tunnelling Protocol (L2TP), Internet Protocol Security (IPSec) and (SSL/TLS). In order to fully understand how a VPN protects your privacy, we need to dig a little deeper into the science of encryption. VPN uses a technique known as ‘encryption’ to make your readable data (plaintext) completely unreadable (cipher text) by any person that intercepts it as it travels through the Internet. Usb size for mac bootcamp. An algorithm or cipher dictates how the encryption and decryption process takes place within the VPN protocols.

VPN protocols employ these cryptographic algorithms to obscure your data in order to keep your browsing activities private and confidential. Each of these VPN protocols has its strengths and weaknesses depending on the cryptographic algorithm implemented within it. Some VPN providers give users the option to choose from different ciphers. The algorithm or cipher can be based on any of these three classifications: symmetric, asymmetric, and hashing algorithm. Symmetric encryption uses one key to lock (encrypt) and another to unlock (decrypt) data. Asymmetric encryption uses two keys, one for locking (encrypting) and the other for unlocking (decrypting) data.

The table below is a summary comparison between Symmetric and asymmetric encryption. Attribute Symmetric Asymmetric Keys One key is shared among multiple entities One entity has the public key, the other has the private key Key exchange Requires secure mechanism for sending and receiving keys Private key is kept secret by the owner while the public key is available to everyone Speed Less complex and faster More complex and slower Strength Less harder to break Harder to break Scalability Good scalability Better scalability Use Bulk encryption i.e. Everything Only key distribution and digital signatures Security service offered Confidentiality Confidentiality, authentication and non-repudiation Examples DES, Tipple DES, AES, Blowfish, IDEA, RC4, RC5 and RC6 RSA, ECC, DSA, and Diffie-Hellman Asymmetric cryptography is the solution to the limitations inherent in symmetric cryptography (as shown in the table above).