Download to read offline
Secure Socket Layer.ppt [ssl for websecurity]
- 1. Secure Socket Layer Visitfor more Learning Resources
- 2. Secure Socket Layer(SSL) •managing the security of a message transmission between web browser and web server. • SSL is included as part of both the Microsoft and Netscape browsers and most web server products. • SSL is logically a pipe between web browser and web server.
- 3.
- 4. • It istwo layer protocol • Layer 1: SSL Record Protocol • Layer 2: It is three layer protocol » The Handshake protocol » The change Cipher Spec Protocol » The Alert protocol
- 5. SSL Record Protocol •Provides two services: – Confidentiality • By encrypting data – Message Integrity • by using a message authentication code (MAC)
- 6.
- 7. • The RecordProtocol takes an application message to be transmitted, fragments the data into manageable blocks, optionally compresses the data, applies a MAC, encrypts, adds a header, and transmits the resulting unit in a TCP segment. Received data is decrypted, verified, decompressed, and reassembled and then delivered to the calling application, such as the browser.
- 8. Handshake Protocol • Themost complex part of SSL is the Handshake Protocol. • This protocol allows the server and client to authenticate each other and to negotiate an encryption and MAC algorithm and cryptographic keys to be used to protect data sent in an SSL record. • The Handshake Protocol is used before any application data is transmitted. • The Handshake Protocol consists of a series of messages exchanged by the client and the server.
- 10. Change Cipher SpecProtocol • It is the simplest protocol. • This protocol consists of a single message, which consists of a single byte with the value 1. • The sole purpose of this message is to cause the pending state to be copied into the current state, which updates the Cipher Suite to be used on this connection. • This signal is used as a coordination signal. • The client must send it to the server and the server must send it to the client. • After each side has received it, all of the following messages are sent using the agreed-upon ciphers and keys
- 11. Alert Protocol • Itis used to convey SSL-related alerts. • Each message in this protocol consists of two bytes. • The first byte takes the value "warning" (1) or "fatal"(2) to convey the severity of the message. If the level is fatal, SSL immediately terminates the connection. For more detail contact us