Computer Security Essay

Encryption is dodging of scrambling data in some means during transmission. In periods of war, the call of encoding becomes paramount so those messages be not intercepted by the opponent forces. at that place ar a number of polar ways to protect data during transmission, such as Substitution ( timber for character replacement) in which one unit (usually character) of cipher schoolbook (unintelligible text or signals produced through an encryption system) is substituted for a corresponding unit of plain text (the intelligible text or signals that throw out be read without employ decryption), according to the algorithm in use and the specific key.The other method is Transposition (rearrangement characters) which is the encryption process in which units of the original plain text (usually individual characteristics) are simply moved around they appear unvarying in the cipher text for their relative location.Study Case (Bank of Shenandoah Valley) turn both encryption and au thentication method are providing some measures of security, the executing of security itself has totally a different approach. Before any methods chosen, the deuce most important factors in security implementations are having to be determined. The level of security needed and the cost involved, so the appropriate steps can be taken to ensure a safe and secure environment. In this case Bank of Shenandoah Valley is in type of business which a high level of security is required, therefore, I would suggest the use of encryption method with a complex algorithm involved.Although an authentication method is a secure method as comfortably, is not as complex as encryption method of complex algorithm since it has been used in military during the war where a high levels of security are a must. During the war, the use of encryption becomes paramount so those messages are not intercepted by the opposing forces. This is a perfect example of how reliable an encrypted message can be while used within its appropriates guidelines.4- Describe the three different database models class-conscious, comparative and network.For data to be effectively transformed into useful information, it must be nonionic in a logical, meaningful way. Data is generally create in a hierarchy that starts with the smallest unit (or piece of data) used by the computer and then progresses into the database, which holds all the information about the topic. The data is organized in a top down or inverted shoetree likes structure. At the top of every tree or hierarchy is the reservoir segment or element of the tree that corresponds to the main record type.The hierarchical model is best suited to situations in which the logical relationship betwixt data can be properly presented with the one parent many another(prenominal) children (one to many) approach. In a hierarchical database, all relationships are one to -one or one- to many, but no group of data can be on the many side of more than on e relationship.Network Database is a database in which all types of relationships are allowed. The network database is an extension of the hierarchical model, where the various levels of one-to-many relationships are re primed(p) with owner-member relationships in which a member may have many owners. In a network database structure, more that one path can ofttimes be used to access data. Databases structured according to either the hierarchical model or the network model suffers from the same deficiency erst the relationships are established between the data elements, it is difficult to modify them or to create brisk relationships.Relational Database describes data using a exemplar tabular format in which all data elements are placed in two-dimensional tables that are the logical equivalent of files. In comparative databases, data are accessed by content sort of than by regale (in contrast with hierarchical and network databases). Relational databases locate data logically, ra ther than physically. A relational database has no predetermined relationship between the data such as one-to-many sets or one-to-one.Case study ( DAngelo Transportation, Inc.)There are a number of factor which ought to be discussed during discussionO How much of the system should by computerized?O Should we purchase software or build based on what we are using in the accredited system. ( make versus buy analysis)O If we decide to make the new system, should we pattern an on-line or batch system?O Should we design the system for a mainframe computer, minicomputer, microcomputers or some combinations?O What information technologies major power be useful for this application?Some of the security issues, are harp of the level of security required and the cost involved in this conversion. A database system is vulnerable to criminal attack at many levels. Typically, it is the oddment user rather the programmer who is often (but not always) guilty of the fair misuse of applications. Thus, it is crucial that the total system is secure. The two classifications of security violations are malicious or accidental.One of the most emphasized and significant factors of any program development is the early involvement of the end-users. This provides the programmer as well as the end-user with important functionality of the new system and help them to adapt to the new working environment more efficiently and effectively. The continuos training of the staff is essential in meeting the objectives of the organization since they will be provided with needed skills and expertness necessary to deal with daily issues using of new system.