Fundamentals of Computer Network Security This specialization in intended for IT professionals, computer programmers, managers, IT security professionals who like to move up ladder, who are seeking to develop network system security skills. Through four courses, we will cover the Design and Analyze Secure Networked Systems, Develop Secure Programs with Basic Cryptography and Crypto API, Hacking and Patching Web Applications, Perform Penetration Testing, and Secure Networked Systems with Firewall and IDS, which will prepare you to perform tasks as Cyber Security Engineer, IT Security Analyst, and Cyber Security Analyst. course 2 Basic Cryptography and Programming with Crypto API: About this course: In this MOOC, we will learn the basic concepts and principles of cryptography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account. Module 1 - Basic Cryptography In this module we learn the basic concepts and principles of crytography, introduce the basic concept of cryptoanalysis using mono-alphabetic substitution cipher as an example, and discuss the one-time-pad and quantum key distribution concepts. Learning Objectives • Compose secure program with Crypto API for encryption, authentication, and integrity checking • Understand terminologies of basic cryptography • Understand Kerchhoff Principle • Apply cryptoanalysis techniques on mono-alphabetic ciphers • Explain why one time pad is strongest and understand how quantum key can be distributed
Views: 551 intrigano
https://www.wibu.com/bb Auguste Kerckhoffs postulated his eponymous principle back in the 19th century: "A cryptosystem should be secure even if everything about the system, except for the key, is public knowledge". This means that an effective cryptographic method does not have to be kept secret. If it were, you should wonder why. Wibu-Systems has been true to this principle for several years. Blurry Box cryptography offers software protection that is completely based on publicly available methods and that can thus be assessed and compared. Blurry Box makes it so hard to counterfeit the software that it would be easier and faster to re-develop the application from scratch! http://www.wibu.com/protection-suite/blurry-box-cryptography.html. To test the validity and strength of the newly patented encryption method Blurry Box, now integrated with the anti-debug and obfuscation methods of CodeMeter, Wibu-Systems launched a contest, open to all hackers around the globe. None of the 315 international participants managed to send in a full crack of the encryption scheme. http://www.blurrybox.com. Contact our encryption specialists to see which software protection solution works best for you: www.wibu.com/bb.
Views: 893 WIBU-SYSTEMS AG
Software hat einen immer größeren Anteil an der Wertschöpfung. Der Schutz von Software wird daher ein immer wichtigeres Teilgebiet der IT-Sicherheit. Softwareschutz verhindert das Kopieren und das Reverse-Engineering von Softwareprodukten und schützt so vor Industriespionage. Softwareschutz ist auch eine Grundlage für manipulationssichere Soft- ware und sichert so die Industrie der Zukunft vor Cyber-Sabotage. Der bisher in der Praxis verwendete Softwareschutz funktioniert nur dann gut, wenn die verwendeten Methoden geheim gehalten werden. Ein Angreifer, der diese Methoden genau kennt, hat es deutlich einfacher den Softwareschutz zu brechen. Dieses Vorgehen widerspricht Kerckhoffs’ Prinzip, dass die Sicherheit auf der Geheimhaltung eines (kurzen) Schlüssels beruhen soll und NICHT auf der Geheimhaltung der Methode. Man kennt Methoden die einen wirksamen Softwareschutz nach Kerckhoffs’ Prinzip garantieren, diese sind für die Praxis aber wertlos, da sie viel zu aufwendig sind. Es wäre dann sogar noch günstiger für jedes Programm einen „eigenen Rechner“ mitzuliefern, auf dem nur diese Software läuft und die diesen Rechner nie verlässt. Stattdessen verwendet Blurry Box® nur eine kleine externe Hardware – das sogenannte Dongle (siehe Abbildung). Das Blurry-Box®-Verfahren respektiert Kerckhoffs’ Prinzip und beweist sogar die Sicherheit des Softwareschutzes. Videoproduktion: KIT | WEBCAST und Zentrum für Mediales Lernen | http://webcast.kit.edu, http://zml.kit.edu
Views: 1423 KITinformatik
Lecture: DC00AA Security is one of the major challenges facing the IoT domain as cyber-physical systems become commonplace and the number of attacks skyrocket. In this session, we will expand on technical details introduced in the initial IoT Security Concerns presentation and look more closely at both the fundamental technologies that underpin this domain and the implementation of systems utilizing the Renesas Synergy™ Platform. Within the fundamental technologies, we will include a deep-dive analysis of the essentials of cryptography to illustrate how we utilize symmetric and asymmetric technology to deliver confidentiality within systems -- including authentication and authorization. We will also examine what elements a system designer must architect in order to enable the implementation of secure systems. We will also investigate key system implementations of the Renesas Synergy Platform to illustrate how designers can easily utilize key features to develop software and manage memory systems to provide the robustness and availability required for future systems. http://www.renesasdevcon.com/devcon2015
Views: 328 RenesasPresents
In this talk from the March 5, 2012 BayJax event at Yahoo!, Douglas Crockford outlines the basic principles of designing secure software, with a focus on web applications. With his usual sardonic wit, he starts at the beginning (almost literally -- with the invention of language itself) and makes a strong case for designing secure software based on fundamental principles rather than specific techniques, tricks, or hacks.
Views: 33274 YUI Library
Steganography is the practice of concealing a file, message, image, or video within another file, message, image, or video. The word steganography combines the Greek words steganos, meaning "covered, concealed, or protected," and graphein meaning "writing". The first recorded use of the term was in 1499 by Johannes Trithemius in his Steganographia, a treatise on cryptography and steganography, disguised as a book on magic. Generally, the hidden messages appear to be (or be part of) something else: images, articles, shopping lists, or some other cover text. For example, the hidden message may be in invisible ink between the visible lines of a private letter. Some implementations of steganography that lack a shared secret are forms of security through obscurity, and key-dependent steganographic schemes adhere to Kerckhoffs's principle. The advantage of steganography over cryptography alone is that the intended secret message does not attract attention to itself as an object of scrutiny. Plainly visible encrypted messages, no matter how unbreakable they are, arouse interest and may in themselves be incriminating in countries in which encryption is illegal. Whereas cryptography is the practice of protecting the contents of a message alone, steganography is concerned with concealing the fact that a secret message is being sent as well as concealing the contents of the message. Steganography includes the concealment of information within computer files. In digital steganography, electronic communications may include steganographic coding inside of a transport layer, such as a document file, image file, program or protocol. Media files are ideal for steganographic transmission because of their large size. For example, a sender might start with an innocuous image file and adjust the color of every hundredth pixel to correspond to a letter in the alphabet. The change is so subtle that someone who is not specifically looking for it is unlikely to notice the change. ************************** History The first recorded uses of steganography can be traced back to 440 BC when Herodotus mentions two examples in his Histories. Histiaeus sent a message to his vassal, Aristagoras, by shaving the head of his most trusted servant, "marking" the message onto his scalp, then sending him on his way once his hair had regrown, with the instruction, “When thou art come to Miletus, bid Aristagoras shave thy head, and look thereon." Additionally, Demaratus sent a warning about a forthcoming attack to Greece by writing it directly on the wooden backing of a wax tablet before applying its beeswax surface. Wax tablets were in common use then as reusable writing surfaces, sometimes used for shorthand. In his work Polygraphiae Johannes Trithemius developed his so-called "Ave-Maria-Cipher" that can hide information in a Latin praise of God. "Auctor Sapientissimus Conseruans Angelica Deferat Nobis Charitas Potentissimi Creatoris" for example contains the concealed word VICIPEDIA.
Views: 86 Pioneer Academy
Cryptography is the practice and study of techniques for secure communication in the presence of third parties . More generally, it is about constructing and analyzing protocols that overcome the influence of adversaries and which are related to various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation. Modern cryptography intersects the disciplines of mathematics, computer science, and electrical engineering. Applications of cryptography include ATM cards, computer passwords, and electronic commerce. This video targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 244 encyclopediacc
In cryptography, key size or key length is the size measured in bits of the key used in a cryptographic algorithm. An algorithm's key length is distinct from its cryptographic security, which is a logarithmic measure of the fastest known computational attack on the algorithm, also measured in bits. The security of an algorithm cannot exceed its key length, but it can be smaller. For example, Triple DES has a key size of 168 bits but provides at most 112 bits of security, since an attack of complexity 2112 is known. This property of Triple DES is not a weakness provided 112 bits of security is sufficient for an application. Most symmetric-key algorithms in common use are designed to have security equal to their key length. No asymmetric-key algorithms with this property are known; elliptic curve cryptography comes the closest with an effective security of roughly half its key length. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 1471 Audiopedia
This is an audio version of the Wikipedia Article: https://en.wikipedia.org/wiki/Cryptography 00:03:38 1 Terminology 00:07:53 2 History of cryptography and cryptanalysis 00:08:55 2.1 Classic cryptography 00:16:37 2.2 Computer era 00:19:13 2.3 Advent of modern cryptography 00:21:54 3 Modern cryptography 00:23:02 3.1 Symmetric-key cryptography 00:23:13 3.2 Public-key cryptography 00:23:28 3.3 Cryptanalysis 00:27:58 3.4 Cryptographic primitives 00:34:01 3.5 Cryptosystems 00:40:06 4 Legal issues 00:41:12 4.1 Prohibitions 00:43:02 4.2 Export controls 00:43:12 4.3 NSA involvement 00:45:45 4.4 Digital rights management 00:48:46 4.5 Forced disclosure of encryption keys 00:50:51 5 See also 00:53:36 6 References 00:55:46 7 Further reading Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. Listen on Google Assistant through Extra Audio: https://assistant.google.com/services/invoke/uid/0000001a130b3f91 Other Wikipedia audio articles at: https://www.youtube.com/results?search_query=wikipedia+tts Upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts Speaking Rate: 0.8357640430680523 Voice name: en-US-Wavenet-D "I cannot teach anybody anything, I can only make them think." - Socrates SUMMARY ======= Cryptography or cryptology (from Ancient Greek: κρυπτός, translit. kryptós "hidden, secret"; and γράφειν graphein, "to write", or -λογία -logia, "study", respectively) is the practice and study of techniques for secure communication in the presence of third parties called adversaries. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics. Applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications. Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shares the decoding technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names Alice ("A") for the sender, Bob ("B") for the intended recipient, and Eve ("eavesdropper") for the adversary. Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread. Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means. These schemes are therefore termed computationally secure; theoretical advances, e.g., improvements in integer factorization algorithms, and faster computing technology require these solutions to be continually adapted. There exist information-theoretically secure schemes that provably cannot be broken even with unlimited computing power—an example is the one-time pad—but these schemes are more difficult to use in practice than the best theoretically breakable but computationally secure mechanisms. The growth of cryptographic technology has raised a number of legal issues in the information age. Cryptography's potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export. In some jurisdictions where the use of cryptography is legal, laws permit investigators to compel the disclosure of encryption keys for documents relevant to an investigation. Cryptography also plays a major role in digital rights management and copyright infringement of digital media.
Views: 3 wikipedia tts