[Lec-2][Part-3] Mono Alphabetic Shift Cipher - Symmetric Ciphers

By: Cryptography deciphered

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[Lec-2][Part-3] Mono Alphabetic Shift Cipher - Symmetric Ciphers - Video

hyperelliptic curve cryptography, divisor with deg 2 place moving and two static places of deg 1
Here you can see the application of the Artin #39;s aproximation theorem to a hyperelliptic function field to find a principal divisor with a place of degree 2 (...

By: Eduardo Ruiz

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hyperelliptic curve cryptography, divisor with deg 2 place moving and two static places of deg 1 - Video

Cryptography - Breaking the Vigenere Cipher
In this video I go over how to use my Vigenere frequency tool to figure out the keyword used to encrypt a message using the Vigenere Cipher. **This video wil...

By: Brian Veitch

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Cryptography - Breaking the Vigenere Cipher - Video

[Lec-2][Part-1] Caesar Cipher - Symmetric ciphers
Caesar Cipher is one of the foremost ciphers in symmetric ciphers. It substitutes characters to convert plaintext to ciphertext. Easily breakable by bruteforce.

By: Cryptography deciphered

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[Lec-2][Part-1] Caesar Cipher - Symmetric ciphers - Video

Category: Science & Technology Posted: March 18, 2014 03:02PM Author: Guest_Jim_*

Information is an ever growing asset with ever growing value, but just as it becomes more powerful our means of securing information must also grow stronger. Security systems that take advantage of quantum mechanics could be the technologies of choice in the future. Now researchers at the Center for Quantum Technology at the National University of Singapore have devised a new way to secure information that could one day be deployed in our devices.

It is not uncommon for someone to provide information, such as a pin number to a system for verification. Ideally you can trust the system, but sometimes you cannot and this is where the new system can help. It works by creating pairs of photons at one point, called Alice, and having Alice measure half of each pair. Alice then sends the other photons to the other point, called Bob, which then measures the photons. Bob then chooses which photons he wants more information about without revealing his picks to Alice. At this point both Alice and Bob wait a sufficient period of time that any quantum information they may have stored will have decayed. Now Alice can send Bob the information he wants and they can both process the data they have to arrive at information they want. This protocol is known as a 1-2 Random Oblivious Transfer (ROT) as neither party knows about the data the other has.

For their experiments, the researchers performed a random oblivious transfer of 1366 bits and it all finished in about three minutes. While that was done with optics covering a large area, it could potentially be integrated into microchips and allow us to walk around with quantum security devices in our pockets.

Source: Center for Quantum Technologies at the National University of Singapore

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New Quantum Cryptography System for Securely Sharing Information

Introduction to Cryptography - Caesar Cipher
This is my short intoduction to the caesar cipher for middle to high school students.

By: Brian Veitch

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Introduction to Cryptography - Caesar Cipher - Video

[Lec-1] Introduction to Modern Cryptography
The lecture introduces you with modern cryptography and its need. It will serve as base for the upcoming lectures. Thanks to Prof. Kannan @ IIIT-Hyderabad.

By: Cryptography deciphered

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[Lec-1] Introduction to Modern Cryptography - Video

Cryptography,who is Alice and Bob in cryptography
Alice bob in public key cryptography in key exchange in public key algorithms Diffie Helman.

By: Zariga Tongy

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Cryptography,who is Alice and Bob in cryptography - Video

Introduction to Cryptography 2 - Keyword Cipher
This is the 2nd video in cryptography following the caesar cipher. It covers a simple substituion cipher called the Keyword Cipher.

By: Brian Veitch

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Introduction to Cryptography 2 - Keyword Cipher - Video

Dorian S. Nakamoto listens during an interview with the Associated Press on March 6, in Los Angeles.

Image: Damian Dovarganes/Associated Press

By Lorenzo Franceschi-Bicchierai2014-03-17 13:13:25 UTC

Dorian Nakamoto, the man Newsweek claims is the creator of the digital cryptocurrency Bitcoin, denied being the mysterious Satoshi Nakamoto once again.

In a statement issued on Monday by his newly hired lawyer, Ethan Kirschner, Nakamoto said he "did not create, invent or otherwise work on Bitcoin." The 64-year-old went one step further than his previous denial, adding that he doesn't know anything about cryptography, something experts believe he would have needed to create Bitcoin.

"I have no knowledge of nor have I ever worked on cryptography, peer to peer systems, or alternative currencies," Nakamoto wrote in the statement, first reported by The Los Angeles Times.

Cryptography experts like Ed Felten, a professor of computer science at Princeton University, have doubted the Newsweek report on the grounds that the article doesn't prove, or even allege, that Dorian Nakamoto has any background in cryptography.

"The real Satoshi was obviously conversant with crypto the Bitcoin design shows it, and the fluency of the crypto discussion in the paper tells us that Satoshi was well acquainted with the jargon and literature of the field," Felten wrote in a blog post on March 11. "Newsweek doesnt offer any evidence that Dorian knew crypto."

In the statement, Nakamoto again claimed he first heard of the word Bitcoin when his son called him in mid-February, after talking to a reporter. Nakamoto clarified that he "never consented to speak with the reporter" when Newsweek's Leah McGrath Goodman confronted him in front of his house. That's when Nakamoto uttered the key quote in Newsweek's story: "I am no longer involved in that and I cannot discuss it."

Nakamoto even added that he can't even afford to pay for his Internet connection, which he discontinued in 2013 "due to severe financial distress."

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Dorian Nakamoto: I'm Not Satoshi, I Don't Know Cryptography