7 - eBusiness

M cheung william tan and carson woo 18 recipients

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Unformatted text preview: ret key Message BUSI 335 Encryption Decryption Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 18 Recipient’s public key Recipient’ Message 19 Message BUSI 335 Encryption Recipient’s private key Recipient’ Ciphertext Decryption Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo Message 20 The Client/Server Model For discussions … • A Client • What are digital signatures? • What is two-factor authentication? – A program or a (computer-based) process that requests a service – Example: A computer application retrieves/queries information about books from the central library database. • A Server – A program or a (computer-based) process that provides a service in response to the client’s request – Example: The central library system that receives the request from the client application and returns the information about the books to the client • The client and the server can be on the same machine!!! – Example: Your computer can host a Web site but it can also visit other Web sites BUSI 335 Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 21 BUSI 335 Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo The Client/Server Model (cont’d) 22 Types of Servers • Non-database example – Internet Explorer (browser) is a client – www.ubc.ca is the address of a web server There are many kinds of servers on the Internet: Mail servers Web servers Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo Commerce servers Application servers and Database servers Source: Database Systems by Rob and Coronel BUSI 335 File servers File 23 BUSI 335 Copyright © 2009-10 Y.M. Cheung, William Tan and Carson Woo 24 Types of Servers (cont’d) Types of Servers (cont’d) Mail Server Sender’s Sender’ mail client What are file servers? file Receiver’s Receiver’ mail client Message sender The most common protocol for file servers is called FTP. Message receiver Sender’s Sender’ mail server BUSI 335 File...
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