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

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ISP

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Backbone

© Prentice Hall, 2000

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.)

– 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.)

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