Ssl encryption12/25/2023 ![]() ![]() Web Browser and server encrypt data over the connection using the session key.Browser uses this Public Key to agree a session key with the server.To do this the CA certificate needs to be in the browser’s trusted store( See later) Browser verifies the certificate by checking the signature of the CA.Server Responds with Server Certificate containing the public key of the web server.Browser connects to server Using SSL (https). ![]() This connection is used on the Internet to send email in Gmail etc and when doing online banking,shopping etc. To illustrate we will look at a typical web browser and web server connection using SSL. Now when someone wants your public keys, you send them the certificate, they verify the signature on the certificate, and if it verifies, then they can trust your keys. The certificate is signed by the Issuing Certificate authority, and this it what guarantees the keys. The certificate authority does some checks ( depends on authority), and sends you back the keys enclosed in a certificate. You fill out the appropriate forms add your public keys (they are just numbers) and send it/them to the certificate authority. Just like you get a passport from a passport office. You get a digital certificate from a recognized Certificate authority (CA). The answer is to use a digital certificate.Ī certificate serves the same purpose as a passport does in everyday life.Ī passport established a link between a photo and a person, and that link has been verified by a trusted authority (passport office).Ī digital certificate provides a link between a public key and an entity (business,domain name etc) that has been verified ( signed) by a trusted third party ( A certificate authority)Ī digital certificate provides a convenient way of distributing trusted public encryption keys. How do you know that it does belong to your bank? How do you know that a particular public key belongs to the person/entity that it claims to be.įor example, you receive a key claiming to belong to your bank. Public keys can be made available to anyone, hence the term public.īecause of this there is a question of trust, specifically: 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.
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