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Cryptographie - partie 1 : chiffrement de César
 
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Chapitre "Cryptographie" - Partie 1 : Le chiffrement de César Plan : César a dit... ; Des chiffres et des lettres ; Modulo ; Chiffrer et déchiffrer ; Espace des clés et attaque ; Algorithmes Exo7. Cours et exercices de mathématiques pour les étudiants. Retrouvez le polycopié sur http://exo7.emath.fr
Views: 113677 Exo7Math
Chiffrement affine : comment coder et décoder un message - arithmétique - spé maths - 💡💡💡
 
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Objectifs: - Savoir utiliser les congruences pour coder un message - Savoir trouver un inverse avec des modulos - Savoir décoder un message http://jaicompris.com/lycee/math/arithmetique/congruence-Z.php 💡💡💡: difficulté: type BAC arithmétique - spé maths - terminale S - mathématiques
Views: 10061 jaicompris Maths
Cryptographie - partie 6 : chiffrement RSA
 
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Chapitre "Cryptographie" - Partie 6 : Le chiffrement RSA Plan : Calcul de la clé publique et de la clé privée ; Chiffrement du message ; Déchiffrement du message ; Algorithmes Exo7. Cours et exercices de mathématiques pour les étudiants. Retrouvez le polycopié sur http://exo7.emath.fr
Views: 71070 Exo7Math
Chiffrement de Hill - coder et décoder un message - matrices et congruences - terminale S spé
 
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Objectifs : - Coder et décoder un message à l'aide d'un chiffrement de Hill - Etudier un exemple de chiffrement polyalphabétique - Calculer avec les matrices - inverse d'une matrice - Calculer avec les congruences Cours de mathématiques, terminale S, spécialité
Views: 2174 jaicompris Maths
Sécurité 2 : Cryptographie Symétrique
 
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Dans cette 2e vidéo, je présente la base de la cryptographie symétrique utilisée de nos jours dans la confidentialité des communications. Lien vers la vidéo suivante : https://www.youtube.com/watch?v=MuNyEoU5tSo Prérequis : - Sécurité 1 : Introduction à la Cryptographie (https://www.youtube.com/watch?v=V9bTy0gbXIQ) - Encodage de l'information 1 : Représentations binaires (https://www.youtube.com/watch?v=y2e7RuFd5gU&t=389s) Contenu : - Chiffrement de Vernam - Block/Stream ciphers - DES - AES - modes ECB et CBC - RC4 et A5 (brièvement)
Views: 2854 L'informateur
Cryptographie cours : Principes fondamentaux
 
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Vidéo présentant les principes fondamentaux en cryptographie. Le plan est le suivant : - Définition de la cryptographie , cryptanalyse - Les protagonistes habituels - Les termes utilisés - L'histoire du chiffrement - Le chiffrement "parfait" - Algorithme symétrique - Algorithme asymétrique ------------------------------------------------------------------------ Définition du modulo : Le modulo est le reste de la division euclidienne Exemple : 7 mod 3 = 1 29 mod 26 = 3 ------------------------------------------------------------------ Laissez moi en commentaire vos avis, vos suggestions ou les thèmes que vous voulez que j'aborde. Partagez la vidéo si elle vous a plus !
Views: 1862 Hack School
[Cours #1] La Cryptographie - Les bases
 
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Allez voir ces deux sites de ventes de clé achetables via son forfait téléphonique ;) : Lien PS Paradise : http://www.psparadise.fr/accounting-register/555ab32b20075 Lien PC Paradise : http://www.pc-paradise.fr/accounting-register/555cbeb056400 ABONNEZ-VOUS ET LIKEZ !! Bonne Vidéo !!
Views: 7478 FzF_StormZ
Systeme de cryptage et decryptage HTML et PHP
 
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Bonjours tous les monde, voici un petit tuto sur comment crypter et décrypter une petite phrase en php.
Views: 5233 JenkoXPlay
Le principe du chiffrement par clefs asymétriques | El Mahdi El Mhamdi
 
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Pour réagir à cette vidéo: http://wandida.com/fr/archives/631 Chiffrer en donnant une clé publique peut parraitre contre-intuitif, depuis des siècles, les humains désirant communiquer de manière cryptée ne pouvaient le faire qu'après rencontre pour convenir du code de chiffrement, depuis les années 1970, grâce à des résultats de mathématique, il est désormais possible de communiquer de manière chiffrer en ne communiquant que des clés publiques ! Bien entendu, celà suppose que le matériel utilisé n'est pas corrompu. Explication de El Mahdi EL MHAMDI
Views: 9295 Wandida, EPFL
Encoding and Decoding Using Matrices
 
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Had a sore throat! Better to play this at a faster speed if you can!! This video teaches you how to encode and decode a matrix with the aid of your graphing calculator.
Views: 52842 Mr. Dan Muscarella
Java prog#129. How to encrypt and decrypt data in Java Part 1
 
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------------------Online Courses to learn---------------------------- Java - https://bit.ly/2H6wqXk C++ - https://bit.ly/2q8VWl1 AngularJS - https://bit.ly/2qebsLu Python - https://bit.ly/2Eq0VSt C- https://bit.ly/2HfZ6L8 Android - https://bit.ly/2qaRSAS Linux - https://bit.ly/2IwOuqz AWS Certified Solutions Architect - https://bit.ly/2JrGoAF Modern React with Redux - https://bit.ly/2H6wDtA MySQL - https://bit.ly/2qcF63Z ----------------------Follow--------------------------------------------- My Website - http://www.codebind.com My Blog - https://goo.gl/Nd2pFn My Facebook Page - https://goo.gl/eLp2cQ Google+ - https://goo.gl/lvC5FX Twitter - https://twitter.com/ProgrammingKnow Pinterest - https://goo.gl/kCInUp Text Case Converter - https://goo.gl/pVpcwL -------------------------Stuff I use to make videos ------------------- Stuff I use to make videos Windows notebook – http://amzn.to/2zcXPyF Apple MacBook Pro – http://amzn.to/2BTJBZ7 Ubuntu notebook - https://amzn.to/2GE4giY Desktop - http://amzn.to/2zct252 Microphone – http://amzn.to/2zcYbW1 notebook mouse – http://amzn.to/2BVs4Q3 ------------------Facebook Links ---------------------------------------- http://fb.me/ProgrammingKnowledgeLearning/ http://fb.me/AndroidTutorialsForBeginners http://fb.me/Programmingknowledge http://fb.me/CppProgrammingLanguage http://fb.me/JavaTutorialsAndCode http://fb.me/SQLiteTutorial http://fb.me/UbuntuLinuxTutorials http://fb.me/EasyOnlineConverter Password Encryption.java JAVA ENCRYPTION/DECRYPTION PROGRAM HELP Encrypting and Decrypting Java Cryptography using Java in Netbeans IDE Cryptography using Java in Netbeans IDE Java Cryptography APIs Cryptography Encrypting and Decrypting a text file in java
Views: 90829 ProgrammingKnowledge
chiffrement symétrique, KeyTool: Génération d'une clé secrète
 
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Génération d'une clé secrète KeyTool
Views: 135 Fesmay Etudiant
Cryptography 101 - - XOR Cipher
 
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XOR ciphers take advantage of Ascii encoding and basic bit switching operations. They are extremely fast, but not particularly secure when used alone, without a key exchange algorithm. XOR ciphers make up much of the basis of how modern encryption works. More Crypto 101: ADFVGX - https://www.youtube.com/watch?v=Y5-ory-Z25g Pigpen - https://www.youtube.com/watch?v=bUlIvx0fgV8 Homophonic Cipher - https://www.youtube.com/watch?v=sB_3fcO8G24 Vigenère Cipher - https://www.youtube.com/watch?v=QzizXgWGjcM Cracking Substitution Ciphers - https://www.youtube.com/watch?v=p99Wo_rr7OA Caesar shift and Atbash - https://www.youtube.com/watch?v=BbcYLI_3mNA Support me on Patreon if you are into that - https://www.patreon.com/laingsoft
Views: 5072 Charles Laing
Cryptography: Transposition Cipher
 
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This lesson explains how to encrypt and decrypt a message using a transposition cipher. Site: http://mathispower4u.com
Views: 51186 Mathispower4u
Comment utiliser le cryptage Vigenère
 
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Comment utiliser le cryptage Vigenère - un des meilleurs cryptage de tous les temps. TÉLÉCHARGER LA TABLE VIGENÈRE: http://i.imgur.com/GemngCa.jpg
Views: 10212 Brian R
Explication - 3 - Internet ! HTTPS et TLS - Le chiffrement des messages
 
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J'explique pourquoi il faut mieux utiliser HTTPS et en quoi ça vous protège. J'y explique les concepts de chiffrement symétrique/asymétrique avec de clef privée/publique. Suivez-moi sur Twitter : https://twitter.com/RemiExplique Rejoignez moi sur Facebook : https://www.facebook.com/RemiExplique Ou encore sur Google+ : https://plus.google.com/u/0/b/109287429508566157120/109287429508566157120 Images: Pixabay (images libres de droits): http://pixabay.com/ Musiques: David TMX - Le curé qui vouliat baiser - Fourni par Jamendo
Views: 6042 Remi Explique
Python Encryption Tutorial with PyCrypto
 
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Sentdex.com Facebook.com/sentdex Twitter.com/sentdex How to use python to encrypt sensitive information, and later decrypt it, using PyCrypto! PyCrypto: https://www.dlitz.net/software/pycrypto/ The Code: http://sentdex.com/sentiment-analysisbig-data-and-python-tutorials/encryption-and-decryption-in-python-code-example-with-explanation/
Views: 75834 sentdex
Cryptage asymétrique
 
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Comprendre le principe du cryptage asymétrique
Views: 1203 René Durcasse
Hill Cipher in Hindi – Complete Algorithm with Example
 
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Hill Cipher in Hindi – Complete Algorithm with Example Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/ Complete Data Structure Videos - https://www.youtube.com/playlist?list=PLV8vIYTIdSna11Vc54-abg33JtVZiiMfg Complete Java Programming Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbL_fSaqiYpPh-KwNCavjIr Previous Years Solved Questions of Java - https://www.youtube.com/playlist?list=PLV8vIYTIdSnajIVnIOOJTNdLT-TqiOjUu Complete DBMS Video Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnYZjtUDQ5-9siMc2d8YeoB4 Previous Year Solved DBMS Questions - https://www.youtube.com/playlist?list=PLV8vIYTIdSnaPiMXU2bmuo3SWjNUykbg6 SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnb7av5opUF2p3Xv9CLwOfbq PL-SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnadFpRMvtA260-3-jkIDFaG Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4
Vigenere Cipher 1
 
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Encrypt the message MAKE IT HAPPEN using the Vigenėre cipher and key word MATH.
Views: 124730 MathAfterMath
Data Encryption using RSA algorithm in Bangla
 
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RSA Algorithm Example |Cryptography
Views: 215 EasyLearn School
PlayFair Cipher in Hindi – Complete Algorithm with Example
 
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PlayFair Cipher in Hindi – Complete Algorithm with Example Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/ Complete Data Structure Videos - https://www.youtube.com/playlist?list=PLV8vIYTIdSna11Vc54-abg33JtVZiiMfg Complete Java Programming Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbL_fSaqiYpPh-KwNCavjIr Previous Years Solved Questions of Java - https://www.youtube.com/playlist?list=PLV8vIYTIdSnajIVnIOOJTNdLT-TqiOjUu Complete DBMS Video Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnYZjtUDQ5-9siMc2d8YeoB4 Previous Year Solved DBMS Questions - https://www.youtube.com/playlist?list=PLV8vIYTIdSnaPiMXU2bmuo3SWjNUykbg6 SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnb7av5opUF2p3Xv9CLwOfbq PL-SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnadFpRMvtA260-3-jkIDFaG Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4
Tuto | Excel | Fonctions affines
 
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Tuto pour comprendre l'utilisation d'un tableur (excel) pour étudier les fonctions affines
Views: 6625 Jean Aimaths
Playfair Cipher Algorithm
 
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This video explains PLAYFAIR CIPHER Algorithm and Program in C. This Playfair cipher tutorial explains encryption and decryption program in c
Views: 11251 Sanketkumar Raval
Terminale S-Spécialité-Antilles septembre 2015 - sujet bac-chiffrement affine bézout
 
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Terminale S-Spécialité-Antilles septembre 2015 - sujet bac-chiffrement affine bézout - C'est un sujet assez simple .
Congruence - Comment déterminer le chiffre des unités de 7^98 - Spé Maths - Terminale S
 
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objectifs: - Savoir calculer avec des congruences et connaitre les règles qu'on a le droit d'utiliser - Savoir utiliser les congruences pour trouver le chiffre des unités http://jaicompris.com/lycee/math/terminaleS-math.php Arithmétique - spé maths - terminale S - mathématiques
Views: 14953 jaicompris Maths
Enigma II Encryption Machine & Puzzle - encode & decode cipher
 
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AVAILABLE AT http://www.creativecrafthouse.com/index.php?main_page=product_info&cPath=137&products_id=964 This is an encryption machine that will allow you to encrypt your own messages and in addition we have provided 8 secret messages for you to try and solve. Send and receive secret messages to anyone who has a machine. its quite easy to use but creates messages that can be extremely complex to decode. Hardwood construction with gears cut from ¼” thick wood. All letters and text are deeply laser engraved into the wood. The gears turn on alloy steel pins. Made in USA and designed to last a lifetime. Available in 2 different sizes. The larger one measures approx. 12.75” x 4.5” x 1”. Each gear is approx. 3.75” in diameter . The smaller size measures 9.4” x3.2” x 1”. Each gear is approx. 3.75” in diameter) Avail at CreativeCrafthouse.com We have also recently done the Confederate Army Cipher, the Union Army Cipher (used for flag signaling) and th Mexican Army Cipher
Views: 40779 dj51florida
Cryptanalysis of Classical Ciphers
 
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Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 12455 nptelhrd
Terminale S -spécialité - Asie juin 2016 - Ex4 (2/2) spé -chiffrement de Hill-sujet bac corrigé
 
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Terminale S -spécialité - Asie juin 2016 - Ex4 (2/2) spé -chiffrement de Hill-sujet bac corrigé Partie B matrice codage
Introduction to Cryptography 2 - Keyword Cipher
 
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This is the 2nd video in cryptography following the caesar cipher. It covers a simple substituion cipher called the Keyword Cipher.
Views: 3019 Brian Veitch
Cryptology vs. Cryptography
 
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Students are often confused as to the difference between "cryptology" and "cryptography". To make matters worse, they often hear the term "cryptography" used incorrectly to mean cryptology. Technically speaking, Cryptology is the field that encompasses both Cryptography (code making) and Cryptanalysis (code breaking). However, people outside the field will use the term "cryptography" because "cryptology" just isn't a very well-known word. Our homepage: https://plaincipher.org
Vernam Cipher (One Time Pad) in Hindi – Complete Algorithm with Example
 
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Vernam Cipher (One Time Pad) in Hindi – Complete Algorithm with Example Like FB Page - https://www.facebook.com/Easy-Engineering-Classes-346838485669475/ Complete Data Structure Videos - https://www.youtube.com/playlist?list=PLV8vIYTIdSna11Vc54-abg33JtVZiiMfg Complete Java Programming Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbL_fSaqiYpPh-KwNCavjIr Previous Years Solved Questions of Java - https://www.youtube.com/playlist?list=PLV8vIYTIdSnajIVnIOOJTNdLT-TqiOjUu Complete DBMS Video Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnYZjtUDQ5-9siMc2d8YeoB4 Previous Year Solved DBMS Questions - https://www.youtube.com/playlist?list=PLV8vIYTIdSnaPiMXU2bmuo3SWjNUykbg6 SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnb7av5opUF2p3Xv9CLwOfbq PL-SQL Programming Tutorials - https://www.youtube.com/playlist?list=PLV8vIYTIdSnadFpRMvtA260-3-jkIDFaG Control System Complete Lectures - https://www.youtube.com/playlist?list=PLV8vIYTIdSnbvRNepz74GGafF-777qYw4
Kryptografie:  Homophone Chiffre 005.crpt
 
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Video aus Kanalmigration
Views: 49 RiftOut
hill cipher 1
 
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Views: 32875 Jeff Suzuki
Cryptography chosen ciphertext attacks  (authenticated encryption)
 
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Cryptography chosen ciphertext attacks To get certificate subscribe: https://www.coursera.org/learn/crypto ======================== Playlist URL: https://www.youtube.com/playlist?list=PL2jykFOD1AWYosqucluZghEVjUkopdD1e ======================== About this course: Cryptography is an indispensable tool for protecting information in computer systems. In this course you will learn the inner workings of cryptographic systems and how to correctly use them in real-world applications. The course begins with a detailed discussion of how two parties who have a shared secret key can communicate securely when a powerful adversary eavesdrops and tampers with traffic. We will examine many deployed protocols and analyze mistakes in existing systems. The second half of the course discusses public-key techniques that let two parties generate a shared secret key.
Views: 116 intrigano
Congruence • Les questions classiques en exercice + méthode • terminale S arithmétique • Spé maths
 
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Objectifs: - connaitre les questions classiques qui tombent en exercice et qu'on peut traiter avec les congruences + la méthode pour les traiter. - trouver un reste dans une division euclidienne - montrer que ...est divisible par .... - résoudre des équations avec des entiers http://www.jaicompris.com/lycee/math/arithmetique/congruence-Z.php mathématiques - terminale S - arithmétique - spécialité maths
Views: 23508 jaicompris Maths
Kin Rayhim Crypt : Chiffrement Mono-alphabétique.
 
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Code Source: https://github.com/E-genin/Kin_Rayhim_Crypt
Views: 103 Useless Projects
Random Oracle Solution - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1253 Udacity
Otp Is A Perfect Cipher Pt 3 - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 2208 Udacity
Polygraphic Part 2 - Hill Ciphers Examples/Encryption/Decryption
 
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A beginner's guide to Polygraphic Ciphers, Part 2. (Hill Ciphers Examples/Encryption/Decryption)
Views: 97330 Daniel Rees
congruence et produit: a-t-on le droit d'utiliser a≡b [n]⇔a×k≡b×k [n] ? spé maths - arithmétique
 
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Objectifs: - quelles règles on a le droit d'utiliser avec les congruences et l'addition - savoir démontrer les propriétés arithmétique - spé maths - mathématiques
Views: 1711 jaicompris Maths
Caesar Cipher
 
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This tutorial will teach you how to encrypt and decrypt messages using the Caesar Cipher.-- Created using PowToon -- Free sign up at http://www.powtoon.com/ . Make your own animated videos and animated presentations for free. PowToon is a free tool that allows you to develop cool animated clips and animated presentations for your website, office meeting, sales pitch, nonprofit fundraiser, product launch, video resume, or anything else you could use an animated explainer video. PowToon's animation templates help you create animated presentations and animated explainer videos from scratch. Anyone can produce awesome animations quickly with PowToon, without the cost or hassle other professional animation services require.
Views: 115260 Lacey Wright
Cipher text & Cryptography
 
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Views: 625 YYY YYY
Playfair Cipher Explained
 
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An animated attempt of explaining the Playfair cipher. This tutorial includes rules of the cipher followed by an example to clear things up. This was a part of my final year project to create a learning aid. I decided to upload this so the animation won't go to waste. All feedbacks welcome. Special thanks to Olivia Beck for creating the background image
Views: 157956 Kenny Luminko
decodage d'information
 
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Views: 218 cours SI
Multiplicative inverses mod n
 
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Views: 74064 GVSUmath
Cryptography lecture series -  fast modular exponential algorithm with example
 
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In this lecture series, you will be learning about cryptography basic concepts and examples related to it. Fast modular exponential algorithm with example.
Views: 198 Eezytutorials
Rot13 - Web Development
 
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This video is part of an online course, Web Development. Check out the course here: https://www.udacity.com/course/cs253.
Views: 6549 Udacity
What is POLYGRAPHIC SUBSTITUTION? What does POLYGRAPHIC SUBSTITUTION mean?
 
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What is POLYGRAPHIC SUBSTITUTION? What does POLYGRAPHIC SUBSTITUTION mean? POLYGRAPHIC SUBSTITUTION meaning - POLYGRAPHIC SUBSTITUTION definition - POLYGRAPHIC SUBSTITUTION explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ A polygraphic substitution is a cipher in which a uniform substitution is performed on blocks of letters. When the length of the block is specifically known, more precise terms are used: for instance, a cipher in which pairs of letters are substituted is bigraphic. As a concept, polygraphic substitution contrasts with monoalphabetic (or simple) substitutions in which individual letters are uniformly substituted, or polyalphabetic substitutions in which individual letters are substituted in different ways depending on their position in the text. In theory, there is some overlap in these definitions; one could conceivably consider a Vigenere cipher with an eight-letter key to be an octographic substitution. In practice, this is not a useful observation since it is far more fruitful to consider it to be a polyalphabetic substitution cipher. In 1563, Giambattista della Porta devised the first bigraphic substitution. However, it was nothing more than a matrix of symbols. In practice, it would have been all but impossible to memorize, and carrying around the table would lead to risks of falling into enemy hands. In 1854, Charles Wheatstone came up with the Playfair cipher, a keyword-based system that could be performed on paper in the field. This was followed up over the next fifty years with the closely related four-square and two-square ciphers, which are slightly more cumbersome but offer slightly better security. In 1929, Lester S. Hill developed the Hill cipher, which uses matrix algebra to encrypt blocks of any desired length. However, encryption is very difficult to perform by hand for any sufficiently large block size, although it has been implemented by machine or computer. This is therefore on the frontier between classical and modern cryptography. Polygraphic systems do provide a significant improvement in security over monoalphabetic substitutions. Given an individual letter 'E' in a message, it could be encrypted using any of 52 instructions depending on its location and neighbors, which can be used to great advantage to mask the frequency of individual letters. However, the security boost is limited; while it generally requires a larger sample of text to crack, it can still be done by hand. One can identify a polygraphically-encrypted text by performing a frequency chart of polygrams and not merely of individual letters. These can be compared to the frequency of plaintext English. The distribution of digrams is even more stark than individual letters. For example, the six most common letters in English (23%) represent approximately half of English plaintext, but it takes only the most frequent 8% of the 676 digrams to achieve the same potency. In addition, even in a plaintext many thousands of characters long, one would expect that nearly half of the digrams would not occur, or only barely. In addition, looking over the text one would expect to see a fairly regular scattering of repeated text in multiples of the block length and relatively few that are not multiples. Cracking a code identified as polygraphic is similar to cracking a general monoalphabetic substitution except with a larger 'alphabet'. One identifies the most frequent polygrams, experiments with replacing them with common plaintext polygrams, and attempts to build up common words, phrases, and finally meaning. Naturally, if the investigation led the cryptanalyst to suspect that a code was of a specific type, like a Playfair or order-2 Hill cipher, then they could use a more specific attack.
Views: 144 The Audiopedia