1 Pertemuan 7 Sistem Keamanan dalam e-Bisnis Matakuliah: H0292 / E-Business Tahun: 2005 Versi: v0 / Revisi 1

2 Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Menjelaskan sistem keamanan dalam e- bisnis

3 Outline Materi Pengamanan Internet Penjualan di Web Multimedia delivery

4 Internet Network Architecture NAP ISP Backbone © Prentice Hall, 2000

5 Internet Security Authenticity –the sender (either client or server) of a message is who he, she or it claims to be Privacy –the contents of a message are secret and only known to the sender and receiver Integrity –the contents of a message are not modified (intentionally or accidentally) during transmission Non-repudiation –the sender of a message cannot deny that he, she or it actually sent the message

6 Message Text Ciphered Text Message Text SenderReceiver EncryptionDecryption Private Key Private Key Encryption ( Symmetrical Key Encryption ) Data Encryption Standard (DES) is the most widely used symmetrical encryption algorithm Encryption

7 Message Text Ciphered Text Message Text SenderReceiver EncryptionDecryption Public Key of Recipient Private Key of Recipient –Public Key Encryption (As ymmetrical Key Encryption ) Encryption (cont.)

8 –Digital Envelope — combination of symmetrical and public key encryption Message Text Ciphered Text Message Text SenderReceiver EncryptionDecryption Session Key Public key of Recipient Public key of Recipient Session Key Digital Envelop Encryption (cont.)

9 Message Text Message Text SenderReceiver EncryptionDecryption Public Key of Recipient Private Key of Recipient –Digital Signatures : Authenticity and Non-Denial Signature Private Key of Sender Public Key of Sender Ciphered Text Encryption (cont.)

10 Penjualan di Web Function Requirements for an Electronic Storefront –Search for, discover, and compare products for purchase –Select a product to be purchased and negotiate or determine its total price –Place an order for desired products –Have their order confirmed, ensuring that the desired product is available –Pay for the ordered products (usually through some form of credit) –Verify their credit and approve their purchase –Have orders processed –Verify that the product has been shipped –Request post-sales support or provide feedback to the seller

11 Electronic storefront must contain: –A merchant system or storefront that provides the merchant’s catalog with products, prices and promotions –A transaction system for processing orders and payments and other aspects of the transaction –A payment gateway that routes payments through existing financial systems primarily for the purpose of credit card authorization and settlement Penjualan di Web

12 Multimedia Delivery Webcasting— describes Internet-based broadcasting of audio and video content –Types of Webcasts Text Streams— Text-only wordcasts and datacasts –to deliver constant news and stock price updates Ambient Webcasts— Video content –is captured from a Webcam and delivered as single-frame updates that are transmitted at periodic intervals Streaming Audio— Web equivalent of radio –to deliver everything from talk radio to sports broadcasts to music previews to archived music and radio shows Streaming Video –to deliver videoconferences where high quality images are not required and there is not much movement among participants

13 Works in a straightforward way Examples of companies offering both Webcast servers and players –RealNetworks ( ) –Liquid Audio ( ) –Xingtech with its streamworks technology ( ) –Apple with its QuickTime system ( quicktime.apple.com )quicktime.apple.com –Microsoft with its Netshow software ( ) Multicasting –stream a Webcast from a central server to other media servers which are distributed to different locations –when a listener or viewer clicks on a Webcast link they are automatically routed to the closest server Webcasting