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Learning Objectives Upon completion of this material, you should be able to:: 

Understand the definition of information security Understand the key terms and critical concepts of information security Comprehend the history of computer security and how it evolved into information security Learning Objectives Upon completion of this material, you should be able to:

What is an Information System?: 

What is an Information System? Information System (IS) is an entire set of software, hardware, data, people, procedures, and networks necessary to use information as a resource in the organization

Critical Characteristics of Information: 

Critical Characteristics of Information The value of information comes from the characteristics it possesses: Availability Accuracy Authenticity Confidentiality Integrity Utility Possession

What is Security?: 

What is Security? “The quality or state of being secure—to be free from danger” A successful organization should have multiple layers of security in place: Physical security Personal security Operations security Communications security Network security Information security

What is Information Security?: 

What is Information Security? The protection of information and its critical elements, including systems that use, store, and transmit that information Necessary tools: policy, awareness, training, education, technology

Securing Components in an Information System : 

Securing Components in an Information System Computer (software and hardware) is the key component in an information system Computer can be subject of an attack and/or the object of an attack When the subject of an attack, computer is used as an active tool to conduct attack When the object of an attack, computer is the entity being attacked

Figure 1-5 – Subject and Object of Attack: 

Figure 1-5 – Subject and Object of Attack

Balancing Information Security and Access: 

Balancing Information Security and Access Impossible to obtain perfect security—it is a process, not an absolute Security should be considered balance between protection and availability To achieve balance, level of security must allow reasonable access, yet protect against threats

Figure 1-6 – Balancing Security and Access: 

Figure 1-6 – Balancing Security and Access

The History of Information Security: 

The History of Information Security Began immediately after the first mainframes were developed Groups developing code-breaking computations during World War II created the first modern computers

Figure 1-1 – The Enigma: 

Figure 1-1 – The Enigma

The 1960s: 

The 1960s Advanced Research Procurement Agency (ARPA) began to examine feasibility of redundant networked communications Larry Roberts developed ARPANET from its inception

Figure 1-2 - ARPANET: 

Figure 1-2 - ARPANET

The 1970s and 80s: 

The 1970s and 80s ARPANET grew in popularity as did its potential for misuse Fundamental problems with ARPANET security were identified No safety procedures for dial-up connections to ARPANET Non-existent user identification and authorization to system Late 1970s: microprocessor expanded computing capabilities and security threats


R-609 Information security began with Rand Report R-609 (paper that started the study of computer security) Scope of computer security grew from physical security to include: Safety of data Limiting unauthorized access to data Involvement of personnel from multiple levels of an organization

The 1990s: 

The 1990s Networks of computers became more common; so too did the need to interconnect networks Internet became first manifestation of a global network of networks In early Internet deployments, security was treated as a low priority

The Present: 

The Present The Internet brings millions of computer networks into communication with each other—many of them unsecured Ability to secure a computer’s data influenced by the security of every computer to which it is connected


Summary Information security is a “well-informed sense of assurance that the information risks and controls are in balance.” Security should be considered a balance between protection and availability. Computer security began immediately after first mainframes were developed

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