The Internet Book

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The Internet Book
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Chapter 30
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E-Commerce Is Big Business

• The term electronic commerce (e-commerce) refers
  to all commercial transactions conducted over the
  Internet.

• May Include
• Banking
• Sending orders
• Investing

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Security Made E-Commerce Possible

• The most common form of e-commerce transaction
  consists of a retail purchase from a catalog.
• Provides a way for user to
• Purchase the item
• Manipulate a shopping cart
• Select a payment method

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Secure Sockets

• A browser keeps messages private by using
  encryption technology.
• Sends information over the Internet by to the
  server.
• Handles the details
• Encrypts the message before sending it

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Public Key Encryption Provides Authenticity

• Public key encryption is surprisingly general.
• Guarantees confidential messages
• Used to verify authenticity

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Digital Signatures

• Encryption technology guarantees that a digital
  signature cannot be forged.
• Created by encrypting the senders private key
• Cannot be a scanned version of a conventional
  signature

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Certificates Contain Public Keys

• Trusted companies register public keys and
  communicate them as needed.
• Provides browser with public key
• Called a digital certificate
• Uses encryption to guarantee security

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What Is Digital Money?

• Digital cash should be the equivalent of the cash
  people carry with them to make small purchases.
• Could be in the form of a debit card
• Allows user to replenish the amount available

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Digital Cash Is Not Widely Available

• Several steps are required to make digital cash
  operate.
• Not possible for a bank to transfer real money to
  an electronic wallet
• Must obtain authorization from user
• Suited for small purchases
• Reduced profit margin

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Business And E-Commerce

• How does e-commerce affect business?
• Affected by two aspects of a company
• External
• Business-to-business communication
• Internal
• Reports for summarization
• Sales
• Delivery
• Items on hand

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A Business Must Protect Its Networks

• The final item a business needs for e-commerce is
  protection against malicious attack.
• Hackers
• Break into computers
• Steal or change information
• Display antisocial behavior

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Firewalls Protect Networks

• The most widely used mechanism to protect private
  networks from outside attack is known as an
  Internet firewall.

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Figure 30.1 Illustration of a firewall that
protects a companys internal networks and
computers from outside attack.
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A Firewall Filters Packets

• A firewall prevents accidental access.
• Prevents outsiders from accessing files
• Protects against all access to unknown services

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Firewalls Guard Against Trojan Horses

• Firewalls protect the company from inside the
  company as well.
• Eliminates vulnerability to a Trojan horse attack
• Can arrive in email

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Conclusion

• Why is digital cash not widely available?
• What is a Trojan horse?

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Glossary

• Digital Signature
• An encrypted message that authenticates the
  author of a document.
• Electronic Commerce
• (e-commerce) A general reference to any business
  conducted over the Internet.

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Glossary

• Firewall
• A security mechanism placed between a company and
  the Internet to protect the companys computers
  from attack.
• Key
• A string used to encrypt data to keep it secure.

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Glossary

• Private Key
• One of two keys issued to a user for security. A
  user must keep their private key secret.
• Public Key
• One of two keys issued to a user for security. A
  user tells everyone their public key.

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Glossary

• Secure Socket Layer
• (SSL) A mechanism invented by Netscape, Inc. to
  provide secure communication between a browser
  and a server.

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Glossary

• Trojan Horse
• A security attack in which someone inside a
  company is tricked into running a computer
  program that sends information from the persons
  computer to an outsider.