Download - Keamanan e bisnis
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Pertemuan 7Sistem Keamanan dalam e-Bisnis
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Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Menjelaskan sistem keamanan dalam e-bisnis
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Outline Materi
• Pengamanan Internet
• Penjualan di Web
• Multimedia delivery
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Internet Network Architecture
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NAP
NAPNAP
NAP
ISP
ISPISP
ISP
ISP ISP
ISP
ISP
ISP
ISP
Backbone
© Prentice Hall, 2000
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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
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Message
Text
Ciphered
Text
Message
Text
Sender Receiver
Encryption Decryption
Private Key Private Key
• Private Key Encryption (Symmetrical Key
Encryption)• Data Encryption Standard (DES) is the most
widely used symmetrical encryption algorithm
Encryption
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Message
Text
Ciphered
Text
Message
Text
Sender Receiver
Encryption Decryption
Public Key of
Recipient
Private Key of
Recipient
– Public Key Encryption (Asymmetrical Key
Encryption)
Encryption (cont.)
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– Digital Envelope — combination of symmetrical and public key encryption
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Message
Text
Ciphered
Text
Message
Text
Sender Receiver
Encryption Decryption
Session Key Session Key
Public key of
Recipient
Public key of
RecipientSession Key Session KeyDigital Envelop
Encryption (cont.)
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Message
Text
Message
Text
Sender Receiver
Encryption Decryption
Public Key of
Recipient
Private Key of
Recipient
– Digital Signatures : Authenticity and Non-Denial
Signature Signature
Private Key
of Sender
Public Key
of Sender
Ciphered
Text
Encryption (cont.)
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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
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Penjualan di Web
• 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
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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
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• Works in a straightforward way
• Examples of companies offering both Webcast servers and players– RealNetworks ( www.real.com )
– Liquid Audio ( www.liquidaudio.com )
– Xingtech with its streamworks technology ( www.xingtech.com )
– Apple with its QuickTime system ( quicktime.apple.com )
– Microsoft with its Netshow software (www.microsoft.com/windows/windowsmedia )
• 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
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Webcasting