Linux Security in Operating System
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Operating system vulnerability and control
Vulnerabilities exist in operating systems like Linux, UNIX and Windows. A vulnerability is a weakness that allows an attacker to compromise a system's security. Vulnerabilities occur at the intersection of a system flaw, an attacker's access to the flaw, and their ability to exploit it. Common UNIX vulnerabilities include setuid problems, trojan horses and terminal troubles. Windows is vulnerable to password issues, peer-to-peer file sharing exploits, and Outlook/Outlook Express bugs. Linux has flaws like missing permission checks, uninitialized data, and memory mismanagement. Control is important for operating systems to balance robustness, predictability and efficiency. The trusted computing base (TCB) aims to enforce security by containing all elements
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The document discusses security mechanisms in Linux operating systems. It covers access control modules, including audit, access control, and role-based access control modules. It also discusses security models like DAC, MAC, RBAC and how they integrate with the operating system's security tag library and audit log. The principles of least privilege, separation of duties and simplicity are important to the design.
Firewalls
Firewalls are used to securely interconnect private networks to the Internet and protect them from external threats. They implement an organization's security policy by filtering network traffic and only allowing authorized connections based on properties like source/destination addresses and ports. There are different types of firewalls that operate at various layers of the network model and use techniques like packet filtering, application proxies, authentication, and content inspection to enforce security. Organizations should choose a firewall configuration based on their specific security needs, from dual-homed gateways to screened subnets in demilitarized zones.
Asiabsdcon2017
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Operating system vulnerability and control
Vulnerabilities exist in operating systems like Linux, UNIX and Windows. A vulnerability is a weakness that allows an attacker to compromise a system's security. Vulnerabilities occur at the intersection of a system flaw, an attacker's access to the flaw, and their ability to exploit it. Common UNIX vulnerabilities include setuid problems, trojan horses and terminal troubles. Windows is vulnerable to password issues, peer-to-peer file sharing exploits, and Outlook/Outlook Express bugs. Linux has flaws like missing permission checks, uninitialized data, and memory mismanagement. Control is important for operating systems to balance robustness, predictability and efficiency. The trusted computing base (TCB) aims to enforce security by containing all elements
Design for security in operating system
The document discusses security mechanisms in Linux operating systems. It covers access control modules, including audit, access control, and role-based access control modules. It also discusses security models like DAC, MAC, RBAC and how they integrate with the operating system's security tag library and audit log. The principles of least privilege, separation of duties and simplicity are important to the design.
Firewalls
Firewalls are used to securely interconnect private networks to the Internet and protect them from external threats. They implement an organization's security policy by filtering network traffic and only allowing authorized connections based on properties like source/destination addresses and ports. There are different types of firewalls that operate at various layers of the network model and use techniques like packet filtering, application proxies, authentication, and content inspection to enforce security. Organizations should choose a firewall configuration based on their specific security needs, from dual-homed gateways to screened subnets in demilitarized zones.
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SysAdm is a BSD-licensed framework for administering FreeBSD/TrueOS systems locally or remotely. It includes a server that runs on managed systems and provides an API, a client with graphical utilities, and an experimental bridge. The server uses JSON over REST or WebSockets and requires authentication. The client accesses server APIs and provides notifications. The bridge allows connections to systems behind firewalls.
FreeBSD System Administration Using SysAdm
The SysAdm framework provides a suite of tools for remotely managing FreeBSD and TrueOS systems. It includes a server component that runs on managed systems and exposes an API. It also includes a graphical client for connecting to servers and performing administration tasks. The client integrates with the system tray and supports notifications. The framework is designed to securely manage multiple remote systems and complement existing FreeBSD configuration methods.
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The document discusses scalability, availability, performance, and reliability as key aspects of system architecture. It describes vertical and horizontal scaling approaches. Security topics covered include cyber security frameworks, protecting people, processes, and technology, and specific areas like application security, cloud security, cryptography, infrastructure security, incident response, and vulnerability management. The goal of architecture is to minimize human resources needed for development and maintenance.
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This document provides an overview of operating system security across different platforms. It discusses OS security basics like separation and access control. It then covers specific areas like user accounts, file systems, networking, authentication methods, access control, logging and auditing, and memory protection. For each area, details are given for both UNIX and Windows environments. The goal is to explain how security is implemented and achieved at the OS level.
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This document discusses computer system protection. It outlines goals of protection like preventing unauthorized access. Principles like least privilege aim to minimize damage from compromised access. Protection domains define which objects and operations processes can access. Access matrices represent these access rights. Examples of early capability-based and language-based protection systems are described.
Os security issues
The document discusses several important operating system security issues. The operating system must provide protection mechanisms to prevent unauthorized access to processes and resources. It also needs flexibility to configure how resources are shared between processes and change these configurations as needed. Key security issues for an operating system include implementing protection mechanisms, controlling resource sharing, enforcing security policies, and utilizing authentication and authorization.
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This document discusses computer system protection. It outlines goals of protection like preventing unauthorized access. Principles like least privilege aim to minimize damage from compromised access. Protection domains define which objects and operations processes can access. Access matrices represent these access rights. Examples of early capability-based and language-based protection systems are described.
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The document discusses several important operating system security issues. The operating system must provide protection mechanisms to prevent unauthorized access to processes and resources. It also needs flexibility to configure how resources are shared between processes and change these configurations as needed. Key security issues for an operating system include implementing protection mechanisms, controlling resource sharing, enforcing security policies, and utilizing authentication and authorization.
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Chapter 14 - Protection
Goals of Protection
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Network security consists of provisions and policies to prevent unauthorized access to computer networks and resources. It involves controlling access to data on a network through authorization. Network security covers both public and private networks used for business, government, and personal communications and transactions. It aims to protect vital information while allowing authorized access, and to provide authentication, access control, and availability of resources. Common methods for securing networks include identification and authentication of users, access control policies, encryption of data at rest and in transit, and securing wireless networks.
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Security features are most important of an operating system. The following security features were developed by Fedora engineers.
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This document discusses various security issues related to computer systems and networks. It covers authentication methods, threats like Trojan horses and viruses, intrusion detection techniques, and encryption standards. It also describes security classifications from the Department of Defense and how Windows NT implements configurable security policies ranging from minimal to discretionary protection.
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The document outlines various security concepts including attacks, services, mechanisms, and methods of defense for network security. It discusses security attacks like interruption, interception, modification, and fabrication. It also covers security services like confidentiality, authentication, integrity, non-repudiation, and availability. Finally, it mentions methods of defense such as encryption, software and hardware controls, policies, and physical controls.
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The document summarizes security vulnerabilities in dial back systems used for computer login authentication. It explains that dial back systems are not foolproof because a hacker could intercept the callback phone call by not hanging up after initial login, taking advantage of caller control phone switches. It also describes other techniques a hacker could use to fool modems and bypass dial back security, such as recording dial tones, ringing, or waiting for the modem to pickup before supplying an answer.
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This PowerPoint presentation is of Data Communication & Computer Network.
Macro assembler
The document discusses the design of a two-pass macro preprocessor. In pass one, macro definitions are identified and stored in a macro definition table along with their parameters. A macro name table is also created. In pass two, macro calls are identified and replaced by retrieving the corresponding macro definition and substituting actual parameters for formal parameters using an argument list array. Databases like the macro definition table, macro name table, and argument list array are used to store and retrieve macro information to enable expansion of macro calls. The algorithm scans the input sequentially in each pass to process macro definitions and calls.
Architecture and security in Vanet PPT
This document discusses Vehicular Ad-Hoc Networks (VANETs) which allow vehicles to communicate with each other to share safety and traffic information. It outlines the architecture of VANETs including vehicle-to-vehicle and vehicle-to-infrastructure communication. The document also discusses security issues in VANETs such as bogus information attacks, identity disclosure, and denial-of-service attacks. It proposes the use of authentication, message integrity, privacy, traceability and availability to address these security requirements. The document assumes that roadways are divided into regions managed by trusted roadside infrastructure units.
Design Model & User Interface Design in Software Engineering
This is an PPT of Software Engineering. This contains the following topic such as "Design Model & User Interface Design in Software Engineering ".
Text Mining of Twitter in Data Mining
This is an PPPt of Data Mining.It contains the following topic such as " Text Mining of Twitter in Data Mining".
DFS & BFS in Computer Algorithm
This document discusses breadth-first search (BFS) and depth-first search (DFS) algorithms for traversing graphs. It provides examples of how BFS uses a queue to search all neighbors at the current level before moving to the next level, while DFS uses a stack and explores each branch as far as possible before backtracking. The document compares key differences between BFS and DFS such as their time and space complexities, usefulness for finding shortest paths, and whether queues or stacks are used. Application areas for each algorithm are also mentioned.
Software Development Method
This is PPT of Computer-Science Paper. This presentation consist of various software development method.
Secant method in Numerical & Statistical Method
This is an PPT of a Mathematical Paper i.e Numerical & Statistical Method. It contsin the following topic such as "Secant method in Numerical & Statistical Method ".
Motivation in Organization
This is an PPT of Management. This contains the following topic such as "Motivation in Organization".
Communication Skill
This document discusses communication and barriers to effective communication. It defines communication as the exchange of information, ideas, thoughts and feelings between individuals through speech, writing and behavior. It then outlines some common barriers to communication, including badly expressed messages, loss in transmission, semantic problems, over or under communication, prejudices on the sender's part, and poor attention, inattentive listening, evaluation, interests/attitudes and refutation on the receiver's part. The document suggests identifying and addressing such barriers to improve communication.
Partial-Orderings in Discrete Mathematics
This is an PPT of Discrete Mathematics. It contains the following topic " Partial-Orderings in Discrete Mathematics ".
Hashing In Data Structure
This document provides an introduction to hashing and hash tables. It defines hashing as a data structure that uses a hash function to map values to keys for fast retrieval. It gives an example of mapping list values to array indices using modulo. The document discusses hash tables and their operations of search, insert and delete in O(1) time. It describes collisions that occur during hash function mapping and resolution techniques like separate chaining and linear probing.
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Design Model & User Interface Design in Software Engineering
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The Intersection between Competition and Data Privacy – CAPEL – June 2024 OEC...
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This presentation by Tim Capel, Director of the UK Information Commissioner’s Office Legal Service, was made during the discussion “The Intersection between Competition and Data Privacy” held at the 143rd meeting of the OECD Competition Committee on 13 June 2024. More papers and presentations on the topic can be found at oe.cd/ibcdp.
This presentation was uploaded with the author’s consent.
Pro-competitive Industrial Policy – OECD – June 2024 OECD discussion
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This presentation by OECD, OECD Secretariat, was made during the discussion “Pro-competitive Industrial Policy” held at the 143rd meeting of the OECD Competition Committee on 12 June 2024. More papers and presentations on the topic can be found at oe.cd/pcip.
This presentation was uploaded with the author’s consent.
Artificial Intelligence, Data and Competition – OECD – June 2024 OECD discussion
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This presentation by OECD, OECD Secretariat, was made during the discussion “Artificial Intelligence, Data and Competition” held at the 143rd meeting of the OECD Competition Committee on 12 June 2024. More papers and presentations on the topic can be found at oe.cd/aicomp.
This presentation was uploaded with the author’s consent.
Gamify it until you make it Improving Agile Development and Operations with ...
So many challenges, so little time. While we’re busy developing software and keeping it operational, we also need to sharpen the saw, but how? Gamification can be a way to look at how you’re doing and find out where to improve. It’s a great way to have everyone involved and get the best out of people.
In this presentation, Ben Linders will show how playing games with the DevOps coaching cards can help to explore your current development and deployment (DevOps) practices and decide as a team what to improve or experiment with.
The games that we play are based on an engagement model. Instead of imposing change, the games enable people to pull in ideas for change and apply those in a way that best suits their collective needs.
By playing games, you can learn from each other. Teams can use games, exercises, and coaching cards to discuss values, principles, and practices, and share their experiences and learnings.
Different game formats can be used to share experiences on DevOps principles and practices and explore how they can be applied effectively. This presentation provides an overview of playing formats and will inspire you to come up with your own formats.
Artificial Intelligence, Data and Competition – ČORBA – June 2024 OECD discus...
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This presentation by Juraj Čorba, Chair of OECD Working Party on Artificial Intelligence Governance (AIGO), was made during the discussion “Artificial Intelligence, Data and Competition” held at the 143rd meeting of the OECD Competition Committee on 12 June 2024. More papers and presentations on the topic can be found at oe.cd/aicomp.
This presentation was uploaded with the author’s consent.
原版制作贝德福特大学毕业证（bedfordhire毕业证）硕士文凭原版一模一样
原版一模一样【微信：741003700 】【贝德福特大学毕业证（bedfordhire毕业证）硕士文凭】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
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留信网认证的作用:
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IEEE CIS Webinar Sustainable futures.pdf
The importance of sustainable and efficient computational practices in artificial intelligence (AI) and deep learning has become increasingly critical. This webinar focuses on the intersection of sustainability and AI, highlighting the significance of energy-efficient deep learning, innovative randomization techniques in neural networks, the potential of reservoir computing, and the cutting-edge realm of neuromorphic computing. This webinar aims to connect theoretical knowledge with practical applications and provide insights into how these innovative approaches can lead to more robust, efficient, and environmentally conscious AI systems.
Webinar Speaker: Prof. Claudio Gallicchio, Assistant Professor, University of Pisa
Claudio Gallicchio is an Assistant Professor at the Department of Computer Science of the University of Pisa, Italy. His research involves merging concepts from Deep Learning, Dynamical Systems, and Randomized Neural Systems, and he has co-authored over 100 scientific publications on the subject. He is the founder of the IEEE CIS Task Force on Reservoir Computing, and the co-founder and chair of the IEEE Task Force on Randomization-based Neural Networks and Learning Systems. He is an associate editor of IEEE Transactions on Neural Networks and Learning Systems (TNNLS).
Disaster Management project for holidays homework and other uses
It talks about disaster management in a helful way.
Proposal: The Ark Project and The BEEP Inc
1.) Introduction
Our Movement is not new; it is the same as it was for Freedom, Justice, and Equality since we were labeled as slaves. However, this movement at its core must entail economics.
2.) Historical Context
This is the same movement because none of the previous movements, such as boycotts, were ever completed. For some, maybe, but for the most part, it’s just a place to keep your stable until you’re ready to assimilate them into your system. The rest of the crabs are left in the world’s worst parts, begging for scraps.
3.) Economic Empowerment
Our Movement aims to show that it is indeed possible for the less fortunate to establish their economic system. Everyone else – Caucasian, Asian, Mexican, Israeli, Jews, etc. – has their systems, and they all set up and usurp money from the less fortunate. So, the less fortunate buy from every one of them, yet none of them buy from the less fortunate. Moreover, the less fortunate really don’t have anything to sell.
4.) Collaboration with Organizations
Our Movement will demonstrate how organizations such as the National Association for the Advancement of Colored People, National Urban League, Black Lives Matter, and others can assist in creating a much more indestructible Black Wall Street.
5.) Vision for the Future
Our Movement will not settle for less than those who came before us and stopped before the rights were equal. The economy, jobs, healthcare, education, housing, incarceration – everything is unfair, and what isn’t is rigged for the less fortunate to fail, as evidenced in society.
6.) Call to Action
Our movement has started and implemented everything needed for the advancement of the economic system. There are positions for only those who understand the importance of this movement, as failure to address it will continue the degradation of the people deemed less fortunate.
No, this isn’t Noah’s Ark, nor am I a Prophet. I’m just a man who wrote a couple of books, created a magnificent website: http://www.thearkproject.llc, and who truly hopes to try and initiate a truly sustainable economic system for deprived people. We may not all have the same beliefs, but if our methods are tried, tested, and proven, we can come together and help others. My website: http://www.thearkproject.llc is very informative and considerably controversial. Please check it out, and if you are afraid, leave immediately; it’s no place for cowards. The last Prophet said: “Whoever among you sees an evil action, then let him change it with his hand [by taking action]; if he cannot, then with his tongue [by speaking out]; and if he cannot, then, with his heart – and that is the weakest of faith.” [Sahih Muslim] If we all, or even some of us, did this, there would be significant change. We are able to witness it on small and grand scales, for example, from climate control to business partnerships. I encourage, invite, and challenge you all to support me by visiting my website.
Artificial Intelligence, Data and Competition – SCHREPEL – June 2024 OECD dis...
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This presentation by Thibault Schrepel, Associate Professor of Law at Vrije Universiteit Amsterdam University, was made during the discussion “Artificial Intelligence, Data and Competition” held at the 143rd meeting of the OECD Competition Committee on 12 June 2024. More papers and presentations on the topic can be found at oe.cd/aicomp.
This presentation was uploaded with the author’s consent.
The Intersection between Competition and Data Privacy – COLANGELO – June 2024...
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This presentation by Professor Giuseppe Colangelo, Jean Monnet Professor of European Innovation Policy, was made during the discussion “The Intersection between Competition and Data Privacy” held at the 143rd meeting of the OECD Competition Committee on 13 June 2024. More papers and presentations on the topic can be found at oe.cd/ibcdp.
This presentation was uploaded with the author’s consent.
2 December UAE National Day - United Arab Emirates
UAE National Day, celebrated on December 2nd, commemorates the unification of the seven emirates and reflects national pride and unity.
ACTIVE IMPLANTABLE MEDICAL DEVICE IN EUROPE
This presentation will help you to know about the classification ,approval process and article related to active implantable medical device
ServiceNow CIS-ITSM Exam Dumps & Questions [2024]
• For a full set of 530+ questions. Go to
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BRIC_2024_2024-06-06-11:30-haunschild_archival_version.pdf
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The Intersection between Competition and Data Privacy – KEMP – June 2024 OECD...
The Intersection between Competition and Data Privacy – KEMP – June 2024 OECD...OECD Directorate for Financial and Enterprise Affairs
This presentation by Katharine Kemp, Associate Professor at the Faculty of Law & Justice at UNSW Sydney, was made during the discussion “The Intersection between Competition and Data Privacy” held at the 143rd meeting of the OECD Competition Committee on 13 June 2024. More papers and presentations on the topic can be found at oe.cd/ibcdp.
This presentation was uploaded with the author’s consent.
Why Psychological Safety Matters for Software Teams - ACE 2024 - Ben Linders.pdf
Psychological safety in teams is important; team members must feel safe and able to communicate and collaborate effectively to deliver value. It’s also necessary to build long-lasting teams since things will happen and relationships will be strained.
But, how safe is a team? How can we determine if there are any factors that make the team unsafe or have an impact on the team’s culture?
In this mini-workshop, we’ll play games for psychological safety and team culture utilizing a deck of coaching cards, The Psychological Safety Cards. We will learn how to use gamification to gain a better understanding of what’s going on in teams. Individuals share what they have learned from working in teams, what has impacted the team’s safety and culture, and what has led to positive change.
Different game formats will be played in groups in parallel. Examples are an ice-breaker to get people talking about psychological safety, a constellation where people take positions about aspects of psychological safety in their team or organization, and collaborative card games where people work together to create an environment that fosters psychological safety.
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Linux Security in Operating System
- 1. BIRLA INSTITUTE OF TECHNOLOGY, MESRA JAIPUR Presented By Anushka Pareek MCA/25024/18 TOPIC : LINUX SECURITY
- 2. INTRODUCTION Being a multi-user system - Linux have a tremendous amount of security to offer; many being open source, which can be validated and modified to meet anyone’s needs. Security mechanisms allow users to service their legitimate needs without compromising the server system security. Resource and file management maintain integrity User privileges are granted. Overall system stability and correctness do not suffer.
- 3. AUTHENTICATION User enters username and password via login Passwords are hashed . Encryption cannot be reversed Stored in /etc/passwd or /etc/shadow Pluggable authentication modules (PAMs) Can reconfigure the system at run time to include enhanced authentication techniques Supports smart cards, Kerberos and voice authentication
- 5. CRYPTOGRAPHY Enables users to access several forms of encryption to protect their data Uses powerful algorithms such as DES, AES and MD5 Kernel uses Cryptographic API to implement IPSec Enables users to create secure (encrypted) file systems Loopback device: Layer between the virtual file system and the existing file system Can be used to encrypt and decrypt data transferred between processes and the underlying file system
- 6. Loopback device providing an encrypted file system using the Cryptographic API.
- 7. ADMINISTERING TRUSTED USERS AND HOSTS The .rhosts file exists in a user's home directory Specifies trusted hosts based on the users choice More headaches for administrator - loss of control Solution - disable or monitor contents.
- 8. In /etc/pam.d/limits.conf Limit processes per user. Limit memory usage. LIMITING USER ACCESS TO SYSTEM RESOURCES
- 9. SYSTEM SECURITY VIEW Root of Trust (e.g., TCG/TPM) Virtualization Layer Linux Kernel Other System Trusted Application Application User authentication Access control (transitions) Firewall Port scan IDS Crypto, Protocol, Access control Administration Set Access Policy Audit IDS Patch Harden
- 10. ACL/MAC PERMISSIONS Access Control List Almost modern files systems, include ACLs to give unprivileged access to only certain users. Permissions are separated by owner , group , and others . Permissions are displayed as rwx rwx rwx Mandatory Access Control More sophisticated form of permissions handling. This is more like application patching, it limits what permission each program is given. MAC programs include: AppArmor, SELinux, SEBSD, GrSecurity, Trusted Solaris and Trusted BSD.
- 11. MEMORY ACCESS Each process has its own page table. All memory access via page table. Easy for OS to terminate process which references an invalid memory address. Access control information for page held in the page table entry (PTE). Prevents executable code from being overwritten Separates kernel code and user code.
- 12. FIREWALLS Firewalls are means of controlling what information is allowed into and out of your local network. Linux Firewalls are ;- IPTables SELinux Scalable Robus
- 13. GRAPHICAL FIREWALL CONFIGURATION UTILITIES Linux supports several graphical tools that can be used to set up a firewall Red Hat Linux includes the lokkit program that walks you through questions and establishes rules based on your security choices Red Hat Linux also includes the firewall-config program, which allows the set up of complex firewall rules
- 14. CONCLUSION Linux is a versatile OS. Security implementation in the OS is spread throughout the system - memory management, file management, process management, etc. Therefore every aspect of security needs to be configured from scratch since default is not maximum security.
- 15. THANK YOU