1. MGT 3225: E-Business Lecture 6: E-commerce Security and Payment Systems
Md. Mahbubul Alam, PhD

2. The E-commerce Security Environment
The Internet is an open, vulnerable-design network, lacks many basic security features.
Overall size and losses of cybercrime unclear
Difficult to quantify the actual amount of the loss
2012 survey: Average annualized cost of cybercrime was $8.9 million/year
Online credit card fraud & phishing attacks are perhaps the most high-profile form of e-commerce crimes.
What is Good E-commerce security?
To achieve highest degree of security
New technologies
Organizational policies and procedures
Industry standards and government laws
Other factors
Time value of money perfect security of every item is not needed forever.
Weigh the cost of security against the potential loss
Security often breaks at weakest link

3. The E-commerce Security Environment
E-commerce security is multi-layered, and must take into account new technology, policies, and procedures, and laws and industry standards.

4. Dimensions of E-commerce Security
Integrity
The ability of ensure that information being displayed on a Web site or transmitted or received over the Internet has not been altered in any way by an unauthorized party.
Nonrepudiation
The ability of ensure that e-commerce participants do not deny (i.e., repudiate) their online actions.
Authenticity
The ability to identify the identify of a person or entity with whom you are dealing on the Internet.
Confidentiality
The ability to ensure that messages and data are available only to those who are authorized to view them.
Privacy The ability to control the use of information about oneself.
Availability
The ability to ensure that an e-commerce site continues to function as intended.

5. Table 5.3, Page 254

6. The Tension Between Security and Other Values
Ease of use
The more security measures added, the more difficult a site is to use, and the slower it becomes.
Too much security can harm profitability, while not enough security can potentially put you out of business.
Public safety and criminal uses of the Internet
Use of technology by criminals to plan crimes or threaten nation-state.

7. Security Threats in the E-commerce Environment
Three key points of vulnerability in e-commerce environment:
Client
Server
Communications pipeline (Internet communications channels)

8. A Typical E-commerce Transaction
Figure 5.2, Page 256

9. Vulnerable Points in an E-commerce Transaction
Figure 5.3, Page 257

10. Most Common Security Threats
Malicious code (malware, exploits)
Drive-by downloads
Viruses replicate & spread to other programs
Worms spread from computer to computer
Ransomware restricting access, asking for payment.
Trojan horses
Backdoors remotely access
Bots, botnets respond to external command
Threats at both client and server levels
Hacking
Hackers vs. crackers (hacker with criminal intent)
Types of hackers: White, black, grey hats
Hacktivism Cybervandalism & data theft for political purposes.
Potentially unwanted programs (PUPs), installed without user’s consent
Browser parasites  monitor & change the setting of a browser.
Adware servers pop-up ads.
Spyware  collect info such as keystrokes, , IM & so on.
Phishing, online attack by a third party to obtain confidential info for financial gain.
Social engineering, exploitation of human fallibility & gullibility to distribute malware.
scams
Spear-phishing
Identity fraud/theft
Cybervandalism
Disrupting, defacing, destroying Web site
Data breach
Losing control over corporate information to outsiders
White hats good hackers, help org’s locate and fix security flaws
Black hats act with intent of causing harm
Grey hats  who believe they are pursuing some greater good by breaking in & reveling system flaws.

11. Most Common Security Threats (cont’d)
Credit card fraud/theft
Spoofing (hiding true identify by IP/ ) and pharming (redirecting a Web link to an address different from the intended one.)
Spam (junk) Web sites (link farms) collection of advertisements.
Identity fraud/theft  unauthorized use of another person’s personal data for illegal purpose.
Denial of service (DoS) attack  flooding a Web site with useless traffic to overwhelm network
Distributed denial of service (DDoS) attack using numerous computers to attack the target network from numerous launch points.
Sniffing  Spying program that monitors information traveling over a network.
Insider attacks
Poorly designed server and client software
Social network security issues
Mobile platform security issues
Vishing target naïve cell phone users with verbal messages to call a certain number.
Smishing  exploit SMS/text messages.
Madware  innocent-looking apps that contain adware that launches pop-up ads.
Cloud security issues

12. Technology Solutions Protecting Internet communications
Encryption
Securing channels of communication
SSL, VPNs
Protecting networks
Firewalls
Protecting servers and clients

13. Encryption
Transforms data into cipher text readable only by sender and receiver.
Purpose:
To secure stored information
To secure information transmission
Cipher text  text that has been encrypted and thus cannot be read by anyone other than the sender and the receiver.
Provides 4 of 6 key dimensions of e-commerce security:
Message integrity  assurance that the message has not been altered.
Nonrepudiation  prevents the user from denying he/she sent the message.
Authentication  provides verification of the identity of the person.
Confidentiality  assurance that the message was not read by others.

14. Symmetric/Secret Key Encryption
Both the sender and receiver use the same digital key to encrypt and decrypt message.
Requires different set of keys for each transaction.
Strength of encryption
Length of binary key used to encrypt data.
Data Encryption Standard (DES), uses a 56-bit encryption key.
Advanced Encryption Standard (AES)
Most widely used symmetric key encryption
Uses 128-, 192-, and 256-bit encryption keys
Other standards use keys with up to 2,048 bits

15. Public Key Encryption Uses two mathematically related digital keys
Public key (widely disseminated)
Private key (kept secret by owner)
Both keys used to encrypt and decrypt message
Once key used to encrypt message, same key cannot be used to decrypt message
Sender uses recipient’s public key to encrypt message; recipient uses private key to decrypt it.

16. Public Key Encryption using Digital Signatures and Hash Digests
Hash function:
Mathematical algorithm that produces fixed-length number called message or hash digest.
Hash digest of message sent to recipient along with message to verify integrity
Hash digest and message encrypted with recipient’s public key
Entire cipher text then encrypted with sender’s private key—creating digital signature—for authenticity, nonrepudiation

17. Digital Envelopes Address weaknesses of:
Public key encryption
Computationally slow, decreased transmission speed, increased processing time
Symmetric key encryption
Insecure transmission lines
Uses symmetric key encryption to encrypt document
Uses public key encryption to encrypt and send symmetric key
“Key within a key”

18. Digital Certificates and Public Key Infrastructure (PKI)
Digital certificate includes:
Name of subject/company
Subject’s public key
Digital certificate serial number
Expiration date, issuance date
Digital signature of CA
Public Key Infrastructure (PKI):
CAs and digital certificate procedures (issue, verify, guarantee digital certificates.
Pretty Good Privacy (PGP  pgpi.org.)

19. Limits to Encryption Solutions
Doesn't protect storage of private key
PKI not effective against insiders, employees
Protection of private keys by individuals may be haphazard
No guarantee that verifying computer of merchant is secure
CAs are unregulated, self-selecting organizations
Secure Sockets Layer (SSL)/Transport Layer Security (TLS)
Establishes secure, negotiated client–server session
Virtual Private Network (VPN)
Allows remote users to securely access internal network via the Internet
Wireless (Wi-Fi) networks
WPA2
Securing Channels of Communication

20. Secure Negotiated Sessions Using SSL/TLS
Figure 5.10, Page 286

21. Protecting Networks Firewall Proxy servers (proxies)
Hardware or software
Uses security policy to filter packets
Two main methods:
Packet filters, examine data packets to determine whether they are destined for a prohibited port or originate from a prohibited IP address.
Application gateways, filter communication based on the application being requested.
Proxy servers (proxies)
Software servers that handle all communications from or sent to the Internet
Limit access of internal clients to external Internet servers.
Dual-home system gateway for internal computers, mail server for external computers.
Intrusion detection systems
Examines network traffic, watching to see if it matches certain patterns or preconfigured rules indicative of an attack.
Intrusion prevention systems
Has all functionality of an IDS, with the additional ability to take steps to prevent and block suspicious activities.

22. Firewalls and Proxy Servers
The Primary function of a firewall is to deny access by remote client computers to local computes.
The primary purpose of a proxy server is to provide controlled access from local computes to remote computers.

23. Protecting Servers and Clients
Operating system security enhancements
Upgrades, patches
Anti-virus software
Easiest and least expensive way to prevent threats to system integrity
Requires daily updates

24. Management Policies, Business Procedures, and Public Laws
Worldwide, companies spend more than $65 billion on security hardware, software, services
Managing risk includes:
Technology
Effective management policies
Public laws and active enforcement
A Security Plan: Management Policies
Risk assessment
Security policy
Implementation plan
Security organization  educate & trains users
Access controls  determine who can gain legitimate access to a network.
Authentication procedures, including biometrics  digital signature, digital certificates, PKI, biological & physical characteristics.
Authorization policies, authorization management systems
Security audit  routine review of access logs.

25. Electronic Payment Systems: Types
Online credit card transactions, most popular, often default choice of payment for e-commerce.
Digital Wallets, use NFC technology. User may pay by simply tapping his phone to a compatible POS terminal with a secret PIN. e.g., Google Checkout.
Digital Cash, “currency” represented in an electronic form. e.g., Octopus Card in Hong Kong, Ez-link Card in Singapore.
Electronic Cheques
Online Stored Value System, e.g., PayPal.
Digital Accumulating Balance Payment Systems, similar to “digital Wallets”, ideal for micro-transaction payments, allows user to make multiple purchases, which will be totaled up & billed for at the end of a time period.
Mobile Commerce, “Wallet phone” No need card authentication or customer signature. e.g., Osaifu Keitai in Japan.
NFC= Near Field Communication, a wireless technology.

26. How an Online Credit Transaction Works
Figure 5.15, Page 302

27. Question Please ?