SSL/TLS use public and private key system for data encryption and data Integrity. This type of key arrangement is very secure and is used in all modern encryption/signature systems. Then you could lock the car, and leave the key in the lock as the same key cannot unlock the car. If this type of key arrangement were used with your car. To decrypt the message you require the private key. This means a message encrypted with a public key cannot be decrypted with the same public key. With Public and Private keys, two keys are used that are mathematically related (they belong as a key pair), but are different. The problem with this type of key arrangement is if you lose the key anyone who finds it can unlock your door. This is the same as the keys (door, car keys) we deal with in everyday life. With a symmetrical key, a key is used to encrypt or sign the message, and the same key is used to decrypt the message. These are considered much more secure than the old symmetrical key arrangement. Symmetrical Keys and Public and Private KeysĪlmost all encryption methods in use today employ public and private keys. RSA, to either encrypt or sign the message. These keys are simply numbers (128 bit being common) that are then combined with the message using a particular method, commonly known as an algorithm- e.g. Sign it– This allows the recipient to be confident that it was you who sent the message, and that the message hasn’t been changed.īoth of these processes require the use of keys.Encrypt it.– This makes the content unreadable so that to anyone viewing the message it is just gibberish.How do you know that no one has changed the message?.How do you know that no one has read the message?.When sending a message between two parties you have two problems that you need to address. You are communicating with the intended person (server).This means that when using SSL/TLS you can be confident that SSL/TLS provides data encryption, data integrity and authentication. SSL is the term commonly used, and today usually refers to TLS. TLS is based on SSL and was developed as a replacement in response to known vulnerabilities in SSLv3. How to get a digital certificate and understand the different common certificate types.Why we need certificates and what they do.

They are commonly used in web browsing and email. Secure Sockets Layer (SSL) and Transport Layer security (TLS ) are protocols that provide secure communications over a computer network or link.

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