E-commerce refers to conducting business via the Internet, includes online banking, trading stocks, and purchasing goods and services. E-commerce has become a fact of modern life, with millions of people now shopping regularly from the convenience of their computers. Many retailers have websites where you can purchase products online, including flowers, pet food, and tonight's dinner.
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privacy: information must be kept from unauthorized parties.
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integrity: message must not be altered or tampered with.
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authentication: sender and recipient must prove their identities to each
other.
- non-repudiation: proof is needed that the message was indeed received.
http://www.ecommerce-digest.com/ecommerce-security-issues.html
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