codetomake.com

What is cryptography? (video) | Cryptography | Khan Academy

2021.03.17 13:45



If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Courses Search Donate Login Sign up Search for courses, skills, and videos Main content Computing Computer science Cryptography Ancient cryptography

Ancient cryptography

What is cryptography? This is the currently selected item. The Caesar cipher Caesar Cipher Exploration Frequency Fingerprint Exploration Polyalphabetic cipher Polyalphabetic Exploration The one-time pad Perfect Secrecy Exploration Frequency stability property short film How uniform are you? The Enigma encryption machine Perfect secrecy Pseudorandom number generators Random Walk Exploration Next lesson Ciphers Current time: 0:00 Total duration: 1:31 0 energy points Computing · Computer science · Cryptography · Ancient cryptography

What is cryptography?

Google Classroom Facebook Twitter Email

Ancient cryptography

What is cryptography? This is the currently selected item. The Caesar cipher Caesar Cipher Exploration Frequency Fingerprint Exploration Polyalphabetic cipher Polyalphabetic Exploration The one-time pad Perfect Secrecy Exploration Frequency stability property short film How uniform are you? The Enigma encryption machine Perfect secrecy Pseudorandom number generators Random Walk Exploration Next lesson Ciphers

Video transcript

Imagine two people who share an important secret have to split up. This requires them to communicate private information from a distance. However, an eavesdropper named Eve also wants this information, and has the ability to intercept their messages. So, Alice decides to communicate using letters written in some kind of secret code. The following analogy is helpful. First, Alice locks her message in a box, using a lock that only she and Bob know the combination to. This is known as 'encryption.' Then, the locked message is sent to Bob. When Bob receives the box, he opens it using the code they shared in advance. This is called 'decryption.' Cryptography begins when we abandon physical locks and use 'ciphers' instead. Think of [ciphers] as virtual locks. Ciphers allow Alice and Bob to scramble and descramble their messages so that they would appear meaningless if Eve intercepted them. Cryptography has been around for thousands of years. It has decided wars, and is at the heart of the worldwide communication network today. The fascinating story of cryptography requires us to understand two very old ideas related to number theory and probability theory. The Caesar cipher Up Next The Caesar cipher

Our mission is to provide a free, world-class education to anyone, anywhere.

Khan Academy is a 501(c)(3) nonprofit organization. Donate or volunteer today!

Site Navigation

About

News Impact Our team Our interns Our content specialists Our leadership Our supporters Our contributors Our finances Careers Internships

Contact

Help center Support community Share your story Press

Download our apps

iOS app Android app

Courses

Math: Pre-K - 8th grade Math: Get ready courses Math: high school & college Test prep Science Computing Arts & humanities Economics Reading & language arts Life skills Language English Country U.S. India Mexico Brazil © 2021 Khan Academy
Terms of use Privacy Policy


  • Cryptography Tutorial - Tutorialspoint
    Definition: Cryptography is associated with the process of converting ordinary plain text into unintelligible text and vice-versa. It is a method of storing and transmitting data in a particular form so that only those for whom it is intended can read and process it.
  • Cryptography | Computer science | Computing | Khan Academy
    Cryptography is used in all fields to secure data and prevent it from getting hacked. For example, for securing passwords, authenticating banking transactions, etc. Nowadays, various new cryptographic techniques are developed and cracked; hence, it is important always to be aware of computer threats and take precautions to avoid them as best as we can.
  • What is Cryptography? Definition of Cryptography ...
    Cryptography is the science of using mathematics to encrypt and decrypt data. Cryptography enables you to store sensitive information or transmit it across insecure networks so that it cannot be read by anyone except the intended recipient.
  • Cryptography Techniques | Learn Main Types Of Cryptography ...
    This is called 'decryption.' Cryptography begins when we abandon physical locks and use 'ciphers' instead. Think of [ciphers] as virtual locks. Ciphers allow Alice and Bob to scramble and descramble their messages so that they would appear meaningless if Eve intercepted them. Cryptography has been around for thousands of years.
  • Cryptography - SlideShare
    Cryptography is the study of secure communications techniques that allow only the sender and intended recipient of a message to view its contents. The term is derived from the Greek word kryptos ...
  • cryptography · PyPI
    This tutorial covers the basics of the science of cryptography. It explains how programmers and network professionals can use cryptography to maintain the privacy of computer data. Starting with the origins of cryptography, it moves on to explain cryptosystems, various traditional and modern ciphers, public key encryption, data integration, message authentication, and digital signatures.
  • Real Life Applications of CRYPTOGRAPHY | by Prashanth ...
    Block Cipher. An encryption method that applies a deterministic algorithm along with a symmetric key to encrypt a block of text, rather than encrypting one bit at a time as in stream ciphers. Example: A common block cipher, AES, encrypts 128-bit blocks with a key of predetermined length: 128, 192, or 256 bits.
  • Cryptography and its Types - GeeksforGeeks
    cryptography is a package which provides cryptographic recipes and primitives to Python developers. Our goal is for it to be your “cryptographic standard library”. It supports Python 3.6+ and PyPy3 7.2+. cryptography includes both high level recipes and low level interfaces to common cryptographic algorithms such as symmetric ciphers, message ...
  • What is cryptography? (video) | Cryptography | Khan Academy
    Cryptography is technique of securing information and communications through use of codes so that only those person for whom the information is intended can understand it and process it. Thus preventing unauthorized access to information.
  • What is Cryptography? | Cryptographic Algorithms | Types ...
    Unit: Cryptography. Lessons. Ancient cryptography. Learn. What is cryptography? (Opens a modal) The Caesar cipher (Opens a modal) Caesar Cipher Exploration (Opens a modal) Frequency Fingerprint Exploration (Opens a modal) Polyalphabetic cipher (Opens a modal) Polyalphabetic Exploration (Opens a modal)