Archive for cryptography

Perfect Secrecy & Pseudorandomness

Posted in Video / Theatre with tags , , , , , on May 4, 2012 by Brit Cruise

Check out my interactive exploration of random walks on khanacademy labs.

When someone rolls dice, or selects a card from a shuffled deck the best possible strategy for predicting the outcome can’t beat a blind guess. This is because each outcome is equally likely. When we apply random shifts to our messages it results in a ciphertext which is indistinguishable from any other message – it contains no information. The problem with this method of encryption (one-time pad) is that we must share all the random shifts in advance. What happens when we apply pseudorandom shifts instead? We can relax our definition of perfect secrecy and achieve practical security

Khan Academy Labs: Exploratory Exercises

Posted in Research and Projects with tags , , on March 30, 2012 by Brit Cruise

One of the most exciting aspects of joining the Khan Academy team, was the potential to explore new ways of integrating video and software. Continue reading

WW2 Encryption Machines – Key Spaces

Posted in Video / Theatre with tags , , , , , , , on March 13, 2012 by Brit Cruise

Over the past few weeks was editing a video which Continue reading

2000 years of Cryptography in 8.5 minutes

Posted in Video / Theatre with tags , , , , , , , on February 14, 2012 by Brit Cruise

This video covers this history of Cryptography through the lens of Cryptanalysis. It takes us from the Caesar Cipher to the one-time pad…a daunting task in 8 minutes. My strategy for this was based on much reflection after completing a course in Cryptography last year…I was seeking out the kernel of what is required to understand the big picture. This brought me to analogies which connect the idea of a fingerprint to unique frequency distribution, and information leak to differentials in the distribution. Hopefully this lends some intuitive weight when I explain the strength of the one-time pad…which is a lovely concept.

Art of the Problem – Kickstarter funding successful

Posted in Research and Projects, Video / Theatre with tags , , , , , on April 1, 2011 by Brit Cruise

I recently launched Art of the Problem on which is an interesting new crowd sourced funding network for creative projects. A total of 88 people pledged to the project and my $4,000 funding goal was reached. As of today (May 13th 2011) production work has commenced on the pilot episode titled ‘Gambling with Secrets’, soon to be available at