Tag Archives: encryption

Cryptology exhibit and special breakfast celebrating Canadian astronaut David Saint-Jacques’ Dec. 3, 2018 launch in Ontario (Canada)

I wish I was near either Ottawa or Kingston in December as there are a couple of very interesting events, assuming you have an interest in cryptology and/or space travel.


This show has been on tour in Ontario and, until Dec. 2, 2018, it will be at the Canada Science and Technology Museum before moving to Kingston (from the Canada Science and Technology Museum’s exhibitions page),

Cipher | Decipher

Pssst…want to know a secret?

One way to safely share secret information is through encryption — which means converting your message into something only the intended recipient can understand. For as long as we’ve had secret information, individuals and organizations have encrypted and analyzed encrypted communications. One way people encrypt their secrets is through ciphers that replace the original message with other letters, numbers, words, or symbols. From schoolyard gossip to military plans, ciphers keep secrets out of the wrong hands.

Cipher | Decipher is an interactive, new exhibition exploring the past and present of communications cryptology — what it is, how it works, and how it affects our lives. See an authentic Enigma cipher machine, or try your hand at logic puzzles and games to see if you have what it takes to work in the field of cryptology!

Developed by the Canada Science and Technology Museum, in partnership with the Communications Security Establishment, this 750 sq. ft. travelling exhibition is already on the move!

Mark your calendar to see Cipher | Decipher at the following locations:

  • Library and Archives Canada: October 5 to October 31, 2018
  • Canada Science and Technology Museum: November 6 to December 2, 2018
  • Military Communications and Electronics Museum, Kingston: December 7, 2018 to March 31, 2019


This information came in a November 27, 2018 special announcement (received via email) from Ingenium (formerly Canada Science and Technology Museums Corporation and not to be confused with the Canada Science and Technology Museum),

Join the Canada Aviation and Space Museum for a special breakfast at the museum, as we witness the historic launch of Canadian astronaut David Saint-Jacques!

Start your day with a breakfast and a big cup of “rocket fuel” (a.k.a. coffee) as we watch the launch of this important space mission.

You’ll hear from Jesse Rogerson, the museum’s Science Advisor, and Iain Christie,

Executive Vice President of the Aerospace Industries Association of Canada about the intricacies of space travel. Canadian astronauts Bob Thirsk and Jenni Sidey-Gibbons will also join the conversation via livestream!

Take a selfie with our cut-out image of David Saint-Jacques, while the kids work on fun space-themed crafts. David Saint-Jacques themed merchandise will be 10% off during the event. Each purchase of a breakfast ticket/group of tickets will receive one FREE family pass, to visit the museum in 2019.

December 3, 2018
6 a.m. – 8:30 a.m.
Tickets: $16 (+ taxes)
Parking fees are additional.

Buy Tickets!

3… 2… 1… liftoff!


Doped carbon nanotubes and a new path to quantum encryption

An April 12, 2016 news item on ScienceDaily describes a use for  carbon nanotubes in the field of quantum encryption,

Critical information, ranging from credit card numbers to national security data, is sent in streams of light, or laser pulses. However, the data transmitted in this manner can be stolen by splitting out a few photons (packets of light) from the laser pulse. Such eavesdropping could be prevented by encoding the data into single photons. But that requires generating single photons. Researchers demonstrated a new material, made from tiny carbon tubes, that emits the desired photons at room temperature.

A March 31, 2016 US Department of Energy news release, which originated the news item, explains the concept in more detail,

Digital eavesdropping could be prevented by encoding bits of information in the properties, or quantum mechanical states, of single photons. Single photons emitted by carbon nanotubes altered, or doped with oxygen, are especially attractive for realizing this quantum information technology.


Single photon generation requires an isolated, quantum mechanical, two-level system that can emit only one photon in one excitation-emission cycle. While artificial nanoscale materials (such as quantum dots and vacancy centers in diamonds) have been explored for single photon generation, none have emerged as the ideal candidate that meets all of the technological requirements. These requirements include the ability to generate single photons in the 1.3 to 1.5 µm fiber optic telecommunication wavelength range at room temperature. Earlier studies revealed that carbon nanotubes were not suited for use in quantum communications because the tubes required extremely low temperatures and had strong photoluminescence fluctuations. In contrast to these earlier findings, researchers led by Han Htoon and Stephen Doorn of the Center for Integrated Nanotechnologies showed that oxygen doping of carbon nanotubes can lead to fluctuation-free photoluminescence emission in the telecommunication wavelength range. Experiments measuring the time-distribution of two successive photon emission events also unambiguously demonstrated single photon emission at room temperature. Furthermore, because oxygen doping is achieved through a simple deposition of a silicon dioxide layer, these doped carbon nanotubes are fully compatible with silicon microfabrication technology and can be fabricated into electrically driven single photon sources. In addition, the silicon dioxide layer encapsulating the nanotubes allows for their easy integration into electronic and photonic integrated circuits. Beyond the implementation of this new method into quantum communication technologies, nanotube-based single photon sources could enable other transformative quantum technologies, including ultra-sensitive absorption measurements, sub-diffraction imaging, and linear quantum computing.

The researchers have provided an illustration of doped carbon nanotubes,

The deposition of a silicon dioxide layer (yellow layer) on a carbon nanotube (gray spheres) introduces solitary oxygen dopants (red spheres). A single photon (red and white star) is emitted when a dopant is excited by a laser pulse (green arrow). Image courtesy of the Center for Integrated Nanotechnologies

The deposition of a silicon dioxide layer (yellow layer) on a carbon nanotube (gray spheres) introduces solitary oxygen dopants (red spheres). A single photon (red and white star) is emitted when a dopant is excited by a laser pulse (green arrow). Image courtesy of the Center for Integrated Nanotechnologies

Here’s a link to and a citation for the paper, which was published a surprisingly long time ago,

Room-temperature single-photon generation from solitary dopants of carbon nanotubes by Xuedan Ma, Nicolai F. Hartmann, Jon K. S. Baldwin, Stephen K. Doorn, & Han Htoon.  Nature Nanotechnology 10, 671–675 (2015)  doi:10.1038/nnano.2015.136 Published online 13 July 2015

This paper is behind a paywall.