Information and network security ins
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This document outlines information and network security. It discusses security goals of confidentiality, integrity and availability. It defines information and information security. Information security aims to prevent unauthorized access, use, disclosure or modification of information. The document also discusses encryption and the symmetric cipher model. Encryption scrambles data using an encryption key so that only authorized parties can access the information. The symmetric cipher model involves plain text being encrypted into cipher text using a secret key, which is then decrypted back into the original plain text.
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The document defines different types of attacks on cryptography systems including passive and active attacks. Passive attacks attempt to learn information without affecting system resources, while active attacks try to alter system operations. The document also discusses cryptography, defining it as the practice of hiding information and converting plain text into unintelligible cipher text. Symmetric key cryptography uses a shared key for encryption and decryption, while asymmetric key cryptography uses public and private key pairs.
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This document provides an overview of a university course on Cryptography and Network Security. It begins with the course syllabus, which outlines topics like security concepts, cryptography concepts and techniques, and types of security attacks. It then discusses key security concepts such as security services, security mechanisms, security attacks, and models for network and access security. It provides examples of security services like authentication, access control, and data confidentiality. It also describes security mechanisms and different classes of security attacks. The document concludes by listing reference books, online videos, related courses, tutorials, and sample multiple choice and problems related to cryptography and network security.
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Information and network security ins
- 1. Prof. Neeraj Bhargava Astha Parihar Department of Computer Science School of Engineering and System Sciences, MDS University, Ajmer Information and Network Security
- 2. OUTLINE Security Goals What is information? What is Information Security? Encryption Symmetric Cipher Model
- 3. Security Goals Confidentiality: The confidentiality aspect refers to limiting the disclosure and access of information to only the people who are authorized and preventing those not authorized from accessing it. Integrity : Integrity refers to the methods for ensuring that data is real, accurate and safeguarded from unauthorized user modification. It is the property that information has not be altered in an unauthorized way Availability: The concept of availability refers to the up time maintenance of all resources and hardware. This means that all the hardware and resources one have are functional all the time. It can also involve carrying out of regular hardware repairs.
- 4. What is Information Information is organized or classified data, which has some meaningful values for the receiver. Information is the processed data on which decisions and actions are based. Information can be : Created, Stored, Destroyed, Processed , Transmitted. Lost, Stolen, Corrupted etc.
- 5. Information Security The quality or state of being secure to be free from danger. Information Security is basically the practice of preventing unauthorized access, use, disclosure, disruption, modification, inspection, recording or destruction of information. Information can be anything like Your details or we can say your profile on social media, your data in mobile phone, your biometrics etc. Thus Information Security spans so many research areas like Cryptography, Mobile Computing, Cyber Forensics, Online Social Media and Encryption etc.
- 6. Encryption Encryption is a way of scrambling data so that only authorized parties can be understand the information. In technical terms it is process of converting plain text to cipher text. Encryption requires the use of an encryption key: An encryption key is a random string of bits created explicitly for scrambling and unscrambling data.
- 9. Plain Text: This is original data or message used as an input. Encryption: Method used for encoding a message or information in a way that only authorized parties can access it and those who are not authorized cannot. Secret Key: An encryption key is a random string of bits created explicitly for scrambling and unscrambling data.
- 10. Cipher Text: Cipher text is encrypted text transformed from plaintext using an encryption algorithm. Decryption: The conversion of encrypted data into its original form is called Decryption. It is generally a reverse process of encryption. It decodes the encrypted information so that an authorized user can only decrypt the data because decryption requires a secret key or password.