Network security consists of provisions and policies to prevent unauthorized access to computer networks and resources. Common network security threats include viruses, worms, Trojan horses, spyware, adware, and hacker attacks. Solutions to these threats include anti-virus software, firewalls, intrusion prevention systems, and virtual private networks. Properly configuring and updating these network security components helps minimize risks while allowing authorized access to network resources.
Slides from the presentation "Modern Cryptography" delivered at Deovxx UK 2013. See Parleys.com for the full video https://www.parleys.com/speaker/5148920c0364bc17fc5697a5
This document discusses post-quantum cryptography and code-based cryptosystems as an alternative that is secure against quantum computers. It describes the McEliece cryptosystem, which uses error correcting codes, and introduces staircase generator codes and randomly split staircase generator codes to improve efficiency and security. The randomly split staircase generator codes cryptosystem allows for both encryption and digital signatures using efficient procedures while providing 80-bit security levels against quantum attacks, though it has large key sizes of around 10 megabytes.
Computer Networking - A Top-down Approach by James F. Kurose, Keith W. Ross (...SIVAKUMAR301575
This document provides instructions for accessing digital resources that accompany the 7th edition of the textbook "Computer Networking: A Top-Down Approach". It outlines a 4-step process for registering on the Companion Website using an included access code. The access code allows 12 months of access to interactive exercises, videos, programming assignments and other supplementary materials. Technical support is available if needed.
This document discusses packet sniffing and ways to detect and prevent it. Packet sniffing involves using a packet sniffer tool to analyze network traffic. While switches make sniffing more difficult than hubs by only sending packets to their intended recipients, there are still sniffing attacks possible like ARP spoofing. The document outlines techniques for sniffing detection such as ARP cache poisoning and tools like Arpwatch. It also recommends prevention methods including port security, authentication, encryption, and secure protocols.
Network security consists of provisions and policies to prevent unauthorized access to computer networks and resources. Common network security threats include viruses, worms, Trojan horses, spyware, adware, and hacker attacks. Solutions to these threats include anti-virus software, firewalls, intrusion prevention systems, and virtual private networks. Properly configuring and updating these network security components helps minimize risks while allowing authorized access to network resources.
Slides from the presentation "Modern Cryptography" delivered at Deovxx UK 2013. See Parleys.com for the full video https://www.parleys.com/speaker/5148920c0364bc17fc5697a5
This document discusses post-quantum cryptography and code-based cryptosystems as an alternative that is secure against quantum computers. It describes the McEliece cryptosystem, which uses error correcting codes, and introduces staircase generator codes and randomly split staircase generator codes to improve efficiency and security. The randomly split staircase generator codes cryptosystem allows for both encryption and digital signatures using efficient procedures while providing 80-bit security levels against quantum attacks, though it has large key sizes of around 10 megabytes.
Computer Networking - A Top-down Approach by James F. Kurose, Keith W. Ross (...SIVAKUMAR301575
This document provides instructions for accessing digital resources that accompany the 7th edition of the textbook "Computer Networking: A Top-Down Approach". It outlines a 4-step process for registering on the Companion Website using an included access code. The access code allows 12 months of access to interactive exercises, videos, programming assignments and other supplementary materials. Technical support is available if needed.
This document discusses packet sniffing and ways to detect and prevent it. Packet sniffing involves using a packet sniffer tool to analyze network traffic. While switches make sniffing more difficult than hubs by only sending packets to their intended recipients, there are still sniffing attacks possible like ARP spoofing. The document outlines techniques for sniffing detection such as ARP cache poisoning and tools like Arpwatch. It also recommends prevention methods including port security, authentication, encryption, and secure protocols.
Intrusion Detection Systems (IDS) monitor network traffic and system activities for malicious activities or policy violations. IDS can be classified as anomaly-based, signature-based, host-based or network-based. Anomaly-based IDS detect novel attacks but generate many false alarms, while signature-based IDS detect known attacks but miss novel ones. Future IDS aim to integrate network and host-based detection and detect novel attacks rather than just specific signatures. IDS help secure networks from intrusions but also have drawbacks like false alarms, inability to detect new threats, and complexity.
Dokumen ini membahas tentang mabit dan nafar dalam pelaksanaan ibadah haji. Mabit dilakukan dalam dua tahap di Muzdalifah dan Mina, sedangkan nafar dibedakan menjadi nafar awal dan nafar akhir berdasarkan jumlah hari melontar jumrah di Mina. Nafar akhir melibatkan melontar jumrah selama 4 hari sehingga jumlah batunya 70 butir.
The Caesar cipher is one of the earliest known substitution ciphers. It works by shifting each letter in a plaintext message by a set number of positions (the key) in the alphabet to encrypt it. For example, with a key of 3, A would be replaced by D, B by E, and so on. Decryption simply requires shifting letters in the opposite direction by the same key. While simple, the Caesar cipher has some mathematical properties and was allegedly used by Julius Caesar to communicate with his army. However, it is also easy to break through brute force by trying all 26 possible keys.
This document discusses different types of ciphers used for encryption. It describes stream ciphers that encrypt data bits using an XOR operation with a keystream. Block ciphers divide data into blocks and encrypt each block separately using keys and an initialization vector. Electronic Code Book (ECB) encryption uses the same key to encrypt each block, revealing patterns, while Cipher Block Chaining (CBC) XORs each plaintext block with the previous ciphertext block before encryption to provide more security.
Nmap is a free and open source security scanning tool used to discover hosts and services on a computer network. It was originally written by Gordon Lyon and first published in 1997. Nmap uses raw IP packets to determine what hosts are available on the network, what services they offer, and what operating systems they are running. It has features like host discovery, port scanning, version detection, OS detection, and scriptable interaction. Nmap is commonly used for network inventory, auditing security, and identifying vulnerabilities, though some uses may be considered illegal without authorization.
Today in modern era of internet we share some sensitive data to information transmission. but need to ensure security. So we focus on Cryptography modern technique for secure transmission of information over network.
Dokumen tersebut membahas tentang akikah, yaitu tradisi memotong rambut bayi baru lahir dan menyembelih hewan ternak sebagai ungkapan syukur atas kelahiran anak. Ia menjelaskan definisi akikah, ketentuan jumlah hewan yang disembelih berdasarkan jenis kelamin anak, waktu pelaksanaan idealnya pada hari ketujuh, dan perbedaan antara akikah dengan kurban. Dokumen ini juga memberikan gambaran
A birthday attack is a type of cryptographic attack that exploits the mathematics behind the birthday problem in probability theory. This attack can be used to abuse communication between two or more parties. The attack depends on the higher likelihood of collisions found between random attack attempts and a fixed degree of permutations
Solat istisqa' adalah solat sunat yang dilakukan untuk memohon hujan dari Allah SWT. Terdapat beberapa persediaan yang perlu dilakukan sebelum solat istisqa' seperti berpuasa, meninggalkan kemaksiatan, dan berdoa secara individu atau berjemaah. Cara melaksanakan solat istisqa' adalah dengan membaca lafaz dan niat khusus, diikuti pembacaan takbir dan surah-surah tertentu untuk setiap ra
This document summarizes key aspects of digital certificates and public key infrastructure (PKI) as discussed in Chapter 6 of the CompTIA Security+ Guide to Network Security Fundamentals. It defines digital certificates and their purpose in establishing trust. It describes the components of PKI including certificate authorities, registration authorities, and certificate repositories. It also outlines different types of digital certificates and standards related to PKI.
Intrusion Detection Systems (IDS) monitor network traffic and system activities for malicious activities or policy violations. IDS can be classified as anomaly-based, signature-based, host-based or network-based. Anomaly-based IDS detect novel attacks but generate many false alarms, while signature-based IDS detect known attacks but miss novel ones. Future IDS aim to integrate network and host-based detection and detect novel attacks rather than just specific signatures. IDS help secure networks from intrusions but also have drawbacks like false alarms, inability to detect new threats, and complexity.
Dokumen ini membahas tentang mabit dan nafar dalam pelaksanaan ibadah haji. Mabit dilakukan dalam dua tahap di Muzdalifah dan Mina, sedangkan nafar dibedakan menjadi nafar awal dan nafar akhir berdasarkan jumlah hari melontar jumrah di Mina. Nafar akhir melibatkan melontar jumrah selama 4 hari sehingga jumlah batunya 70 butir.
The Caesar cipher is one of the earliest known substitution ciphers. It works by shifting each letter in a plaintext message by a set number of positions (the key) in the alphabet to encrypt it. For example, with a key of 3, A would be replaced by D, B by E, and so on. Decryption simply requires shifting letters in the opposite direction by the same key. While simple, the Caesar cipher has some mathematical properties and was allegedly used by Julius Caesar to communicate with his army. However, it is also easy to break through brute force by trying all 26 possible keys.
This document discusses different types of ciphers used for encryption. It describes stream ciphers that encrypt data bits using an XOR operation with a keystream. Block ciphers divide data into blocks and encrypt each block separately using keys and an initialization vector. Electronic Code Book (ECB) encryption uses the same key to encrypt each block, revealing patterns, while Cipher Block Chaining (CBC) XORs each plaintext block with the previous ciphertext block before encryption to provide more security.
Nmap is a free and open source security scanning tool used to discover hosts and services on a computer network. It was originally written by Gordon Lyon and first published in 1997. Nmap uses raw IP packets to determine what hosts are available on the network, what services they offer, and what operating systems they are running. It has features like host discovery, port scanning, version detection, OS detection, and scriptable interaction. Nmap is commonly used for network inventory, auditing security, and identifying vulnerabilities, though some uses may be considered illegal without authorization.
Today in modern era of internet we share some sensitive data to information transmission. but need to ensure security. So we focus on Cryptography modern technique for secure transmission of information over network.
Dokumen tersebut membahas tentang akikah, yaitu tradisi memotong rambut bayi baru lahir dan menyembelih hewan ternak sebagai ungkapan syukur atas kelahiran anak. Ia menjelaskan definisi akikah, ketentuan jumlah hewan yang disembelih berdasarkan jenis kelamin anak, waktu pelaksanaan idealnya pada hari ketujuh, dan perbedaan antara akikah dengan kurban. Dokumen ini juga memberikan gambaran
A birthday attack is a type of cryptographic attack that exploits the mathematics behind the birthday problem in probability theory. This attack can be used to abuse communication between two or more parties. The attack depends on the higher likelihood of collisions found between random attack attempts and a fixed degree of permutations
Solat istisqa' adalah solat sunat yang dilakukan untuk memohon hujan dari Allah SWT. Terdapat beberapa persediaan yang perlu dilakukan sebelum solat istisqa' seperti berpuasa, meninggalkan kemaksiatan, dan berdoa secara individu atau berjemaah. Cara melaksanakan solat istisqa' adalah dengan membaca lafaz dan niat khusus, diikuti pembacaan takbir dan surah-surah tertentu untuk setiap ra
This document summarizes key aspects of digital certificates and public key infrastructure (PKI) as discussed in Chapter 6 of the CompTIA Security+ Guide to Network Security Fundamentals. It defines digital certificates and their purpose in establishing trust. It describes the components of PKI including certificate authorities, registration authorities, and certificate repositories. It also outlines different types of digital certificates and standards related to PKI.
3. Kriptoqrafiya nədir?
““Kriptoqrafiya” iki yunan sözündən
(κρυπτός – gizli və γράφω – yazıram) ibarət
olub, “gizli yazı” mənasını verir. Kriptoqrafiyadan
istifadə haq qında ilk məlumatlar Qədim Misir
(e. ə. 1900-cu il), Qədim Mesopotamiya (e. ə.
1500-cu il) dövrünə aiddir. Sezar şifri adlanan
şifrləmə üsulunu Qədim Roma imperatoru Yuli
Sezar düşünüb tapmışdı.
4. Şifrələmə
Şifrələmə dedikdə açıq mətn
adlanan M başlanğıc məlumatının
şifrələnmiş mətn adlanan M’ formasına
çevrilməsi başa düşülür. Nəzərə almaq
lazımdır ki əks çevirməni həyata keçirmək
üçün açar adlanan əlavə informasiyaya
malik olmaq lazımdır.
5. Şifrələmə 2 cür olur
Simmetrik şifrələmə - şifrələ-
mənin simmetrik alqoritmində bir K
açarından istifadə olunur. Açar məlumatı
şifrələmək və sonrakı mərhələdə şifrədən
çıxarmaq üçün istifadə olunur. Deməli,
məlumatı göndərən və qəbul edən həmin
açara malik olmalıdır.
Asimmetrik kriptoqrafiyada iki
açardan istifadə olunur. Onlardan biri
açıq açarı (sahibinin ünvanı ilə birlikdə
nəşr oluna bilər) şifrləmə üçün istifadə
olunur, digəri gizli açar (yalnız alana
məlum) deşifrləmə üçün istifadə olunur.
Rəqəmsal imza alqoritmlərində gizli açar
şifrləmə, açıq açar isə deşifrləmə üçün
istifadə edilir..
6. Sezar şifrələmə
alqoritmi
Sezar şifrələməsi ilk dəfə Roma
lideri Jüli Sezar tərəfindən istifadə
olunmuş şifrələmə yoludur. Bu
alqoritm simmetrik şifrələməyə
əsaslanır. Bu zaman məlumatı
göndərən şəxs müəyyən açar-a
görə bu məlumatı şifrələyir.
9. Ədəbiyyat
1. İnformasiya təhlükəsizliyi, Dərslik Bakı, «İQTİSAD UNİVERSİTETİ» nəşriyyatı – 2016
2. https://teknolojiprojeleri.com/teknik/sezar-
sifreleme#:~:text=Sezar%20%C5%9Eifreleme%20Y%C3%B6ntemi'nin%20asl%C4%B1nda,
say%C4%B1s%C4%B1%20kadar%20geriye%20g%C3%B6t%C3%BCrmek%20gerekir.
3. http://www.sciencecert.az/cryptography.html
10. ENİGMA
Komputerlərin ixtiraçısı
kimi sayılan Alan Turinq
ikinci dünya
müharibəsində Almanya
ordusuna məxsus
kriptoqrafik şifrələrin
qırılmasında böyük rol
oynayıb. «Enigma»
adlanan maşın sayəsində
İngiltərə Almanyaya qarşı
qələbə qazanmışdır.