Transcript Securing Information Systemsx

C8- Securing Information
Systems
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Security and Control ***
The Security Challenge
Security Vs. Control
• Security: the policies, procedures and technical
measures used to prevent unauthorized access,
alteration, threat or physical damage to
information systems
• Controls: methods to ensure the safety of
assets, reliability of records and adherence to
standards
Security- Vulnerabilities
The potential for unauthorized access, abuse, or fraud is not limited
to a single location but can occur at any access point in the
network.
Smart Phones
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System Vulnerability and Abuse
Internet vulnerabilities
• Vulnerable to outside attacks
• Abuses can have widespread impact
• E-mail increases system vulnerability
• Fixed IP Address- they know where you are!
• VOIP Service Vulnerabilities
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Wireless security challenges
Many Wi-Fi networks can be
penetrated easily by intruders using
sniffer programs to obtain an address
to access the resources of a network
without authorization.
Using the rogue
access points!!!
Malicious Software (Malware)
• Computer viruses:
– Rogue software programs that attach to other programs in order
to be executed, usually without user knowledge or permission
– Deliver a “payload”
– Can spread by email attachments
• Worms:
– Programs that copy themselves from one computer to another
over networks- rely less on human to spread
– Can destroy data, programs, and halt operation of computer
networks
• Trojan Horse:
• A software program that appears to be benign, but then does
something unexpected
• Often “transports” a virus into a computer system
System Vulnerability and Abuse
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Malware …
• SQL injection attacks
• Spyware
– install themselves surreptitiously to monitor user Web
surfing activity/ serve advertising.
– Keyloggers
Hackers & Cybervandalism
• Hackers: individuals who attempt to gain
unauthorized access to a computer system
• Cracker: a hacker with criminal intent
• System intrusion, theft of goods and information,
system damage and cybervandalism
– Cybervandalism: intentional disruption, defacement,
or destruction of a Web site or system
System Vulnerability and Abuse
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Spoofing and Sniffing
• Spoofing
– masquerading as someone else, or redirecting a Web
link to an unintended address
• Sniffing
– an eavesdropping program that monitors information
travelling over a network
System Vulnerability and Abuse
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DoS Attacks
• Denial of Service
• Hackers flood a server with false
communications in order to crash the system
Use thousands of “zombie”
PCs infected with malicious
software without their
owners’ knowledge and
organized into a botnet.
System Vulnerability and Abuse
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Computers As
Targets Of Crime
• Breaching the confidentiality of protected
computerized data
• Accessing a computer system without authority
• Knowingly accessing a protected computer to
commit fraud
• Intentionally accessing a protected computer
and causing damage, negligently or deliberately
• Knowingly transmitting a program, program code
or command that causes damage to it
• Threatening to cause damage to a computer
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Computers As
Instruments Of Crime
• Theft of trade secrets
• Unauthorized copying of software or copyrighted
intellectual property,s uch as articles, books,
music, and video
• Schemes to defraud
• Using e-mail for threats or harassment
• Intentionally attempting to intercept electronic
communication
• Illegally accessing e-mail and voice mail
• Transmitting or possessing child pornography
Computer Crime
• Identity theft
– A crime in which the imposter obtains key pieces of
personal information
– Phishing- Setting up fake Web sites or sending email
messages that look legitimate, and using them to ask
for confidential data
– Eviltwins are wireless networks that pretend to offer
trustworthy Wi-Fi connections to the Internet, such as
those in airport lounges, hotels, or coffee shops.
– Pharming redirects users to a bogus Web page, even
when the individual types the correct Web page
address into his or her browser.
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Computer Crime …
• Click Fraud
• Cyberterrorism and Cyberwarfare
– Exploitation of systems by terrorists
• Internal Threats: Employees
– lack of knowledge is the single greatest cause of
network security breaches
• Software vulnerability
– bugs or program code defects- virtually impossible to
eliminate all bugs from large programs.
– Patches- To correct software flaws vendor creates
small pieces of software called patches
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Phishing
Business Value of
Security and Control
• Different govt. regulations/acts
• Protect own information assets and customers,
employees, and business partner
• legal liability
– litigation for data exposure or theft
• A sound security and control framework= high
return on investment
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Computer forensics
• is the scientific collection, examination,
authentication, preservation, and analysis of
data held on or retrieved from computer storage
media in such a way that the information can be
used as evidence in a court of law.
– Recovering data from computers while preserving
evidential integrity
– Securely storing and handling recovered electronic
data
– Finding significant information in a large volume of
electronic data
– Presenting the information to a court of law
Establishing a Framework
• General controls
– The design, security, and use of computer programs
and the security of data files in throughout the
organization’s IS infrastructure.
– Include software controls, physical hardware controls,
computer operations controls, data security controls,
controls over implementation of system processes,
and administrative controls.
• Application controls
– unique to each application, like payroll
– (1) input controls, (2) processing controls, and (3)
output controls
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Establishing a Framework …
• Risk Assessment
Chief Security Officer (CSO)
– Determine level of risk to the firm in the case of
improper controls
• Security policy
– ranking information risks, identifying acceptable
security goals, and identifying the mechanisms for
achieving these goals.
– Acceptable Use Policy (AUP)
• defines unacceptable and acceptable actions
– Identity Management
• of business processes and software tools for identifying the
valid users of a system and controlling their access to system
resources.
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Two security profiles or
data security patterns
Access rules for different levels of users in the human resources function.
Establishing a Framework …
• Disaster recovery planning
– duplicate computer center
• Business continuity planning
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Fault-tolerant computer systems
High-availability computing
Recovery-oriented computing
Security outsourcing
• Auditing
– An MIS audit examines the firm’s overall security environment as
well as controls governing individual information systems.
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Technologies And Tools
• Access controls
– Consist of all the policies and procedures a company
uses to prevent improper access to systems by
unauthorized insiders and outsiders
• Authentication
– ability to know that a person is who she or he claims
to be
• Passwords, tokens, biometric authentication
• Biometric authentication uses systems that read and interpret
individual human traits, such as fingerprints, irises, and
voices, in order to grant or deny access.
Firewalls
• Firewalls: Hardware and software controlling
flow of incoming and outgoing network traffic
– Packet Filtering examines selected fields in the
headers of data packets flowing back and forth from
network and the Internet
– Stateful inspection provides additional security by
determining whether packets are part of an ongoing
dialogue between a sender and receiver
– Application proxy filtering- examines the application
content of packets. A proxy server stops data
packets originating outside the organization, inspects
them, and passes a proxy to the other side of the
firewall. ……………….
A Corporate Firewall
Intrusion Detection Systems,
and Antivirus
• Intrusion Detection Systems
– Full-time monitoring tools placed at the most
vulnerable points of the corporate networks to detect
and deter intruders
• Antivirus and Antispyware
• Unified Threat Management Systems
– combined into a single appliance various security
tools, including firewalls, virtual private networks,
intrusion detection systems, and Web content filtering
and antispam software.
Technologies And Tools For Security And Control
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Improve Security
• Wi-Fi Network
– Setting
• HTTPS• SSL/TLS- secure connection
Mail/Message Encryption
Encryption
• Encryption-rmvtu[yopm-fodszqujpo
– Coding and scrambling of messages to prevent
unauthorized access to, or understanding of, the data
being transmitted
• Public key encryption:
– Uses two different keys, one private and one public.
The keys are mathematically related so that data
encrypted with one key can be decrypted using only
the other key
• Public Key Infrastructure (PKI):
– Use of public key cryptography working with a
certificate authority
Technologies And Tools For Security And Control
Public Key Encryption
A public key
encryption
system can be
viewed as a
series of public
and private
keys that lock
data when they
are transmitted
and unlock the
data when they
are received.
The sender locates the
recipient’s public key in a
directory and uses it to
encrypt a message. The
message is sent in
encrypted form over the
Internet or a private
network. When the
encrypted message
arrives, the recipient uses
his or her private key to
decrypt the data and read
the message.
Technologies And Tools For Security And Control
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Ensuring System Availability
Solution Guidelines
• Security and control must become a more visible
and explicit priority and area of information
systems investment
• Support and commitment from top management
is required to show that security is indeed a
corporate priority and vital to all aspects of the
business
• Security and control should be the responsibility
of everyone in the organization
Management Opportunities, Challenges, And Solutions
Learning Objectives
• Analyze why information systems need special
protection from destruction, error, and abuse.
• Assess the business value of security and
control.
• Design an organizational framework for security
and control.
• Evaluate the most important tools and
technologies for safeguarding information
resources.
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