Secure Sockets Layer Protocol CS Division Home安全套接字层协议 C分回家.pptVIP

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Secure Sockets Layer Protocol CS Division Home安全套接字层协议 C分回家.ppt

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Secure Sockets Layer Protocol CS Division Home安全套接字层协议 C分回家

Secure Sockets Layer (SSL) Protocol by Steven Giovenco Overview History SSL SSL Roles Protocol Stack The 4 Protocols The Record Layer Message Authentication Code Handshaking Handshaking ChangeCipherSpec Protocol More Handshaking Alert and Application Protocols Benefits and Drawbacks History Need for secure web communication Netscape Worried especially about credit card transaction over the web Also worried about ease of implementation since they wanted this to be industry-standard, not proprietary SSLv1 - 1994 SSLv2 SSLv2 also released in 1994 SSLv1 wasn’t widely implemented Rules for establishing secure connection Rules for public key encryption Optional certificate-based authentication for servers and even clients Flexible No specifically required encryption, compression, or key generation algorithm SSL Roles Two roles Client Initiates communication, lists possibilities for choices Server Listens for client connections, chooses from possibilities sent from clients Both roles simply add Secure Sockets Layer to protocol stack SSL and the Protocol Stack SSL between Transmission Control Protocol (TCP) layer and Application layer Actually 2 layers Record Secure Application Can run under any protocol that relies on TCP, including HTTP, LDAP, POP3, FTP The Four Upper Layer Protocols Handshaking Protocol Establish communication variables ChangeCipherSpec Protocol Alert to a change in communication variables Alert Protocol Messages important to SSL connections Application Encryption Protocol Encrypt/Decrypt application data Record Layer Frames and encrypts upper level data into one protocol for transport through TCP 5 byte frame 1st byte protocol indicator 2nd byte is major version of SSL 3rd byte is minor version of SSL Last two bytes indicate length of data inside frame, up to 214 Message Authentication Code (MAC) Message Authentication Code MAC secures connection in two ways Ensure Client and Server are using same encryption and compression methods Ensure messages sent