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One time pads, (a)symmetric encryption, and bitcoin wallets!

  • Aug 7, 2014 · 6:00 PM

1. One time pads, (a)symmetric encryption, and BTC wallets!

This talk will cover one-time pads, symmetric encryption, and asymmetric encryption. We will give an analysis of each with pros/cons. There will be minimal math ;). This talk is mostly for beginners and semi-technical security people who want a little background on encryption. It is definitely not for hardcore security geeks. We’ll throw in a few demos too like creating a private key, using Truecrypt, and handling bitcoin wallets. This talk will be about 50 or 60 minutes long. If there’s time left, we’ll have a short discussion on crypto history and why you need crypto.


Gavin Trotman-Pitt has been a computer geek for over 20 years. After a long struggle to suppress this deviant tendency, he embraced it as a career. He programmed various mainframe financial systems for many years, while studying computer science in his spare time. He has moved into programming mainly on web server systems, while pursuing his interest in computer security issues.

LinkedIn. Gavin Trotman-Pitt


6:00 - 6:30: Food

6:30 - 6:35: Cybersecurity Opener by Dawn

6:35 - 6:40: Lulzy News by Cindy

6:40 - 6:45: Tool of the Month by Will

6:45 - 7:45: Crypto

7:45+ Craft beer (or soda) @ Legal Seafoods

How to find us 

Why are you charging $1? 

We're looking for an accurate count for food and some people have suggested charging $1. They mentioned that the $1 RSVP charge would get us a pretty accurate headcount and cover some costs at the same time. It seems to be working but let us know if you have another suggestion!

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  • Lauren L.

    did anyone record a video?

    1 · August 9, 2014

    • Robert T.

      Yes, I did. I'll have it online soon

      3 · August 9, 2014

  • Pete S.

    I think it's worth mentioning. There are about 40-50 people with 2-4 slices of pizza and about 50 who got here later and are left high and dry.

    2 · August 7, 2014

    • A. P.

      Yes, that was quite upsetting!

      1 · August 8, 2014

    • Akshat P.

      Thank you for the feedback! We're ironing out some issues for a better experience next time.

      August 9, 2014

  • Will L.

    Excellent intro to crypto!

    1 · August 8, 2014

  • Apollo C.


    1 · August 7, 2014

  • Alexan

    No bitcoin payment option?

    2 · August 7, 2014

    • A. P.


      1 · August 7, 2014

    • Albert W.

      Or some other cryptocurrency…

      1 · August 7, 2014

  • Ori

    Could we please record this presentation? I am not gonna be there but I would love to watch it later if possible.

    4 · May 8, 2014

    • Akshat P.

      Sure, bring your camera.

      1 · August 7, 2014

    • Robert T.

      Sounds good. I'll bring it.

      1 · August 7, 2014

  • Akshat P.

    Hi all, you'll be taking a left instead of right. Say hi to security, and get your name badge and head to up floor 5

    2 · August 7, 2014

  • A former member
    A former member

    Tried to make a payment too but not going through. Is this really neccessary?

    August 6, 2014

    • Akshat P.

      Thanks for the question Don, but it looks like people prefer the $1 charge.­ If you're having trouble making a payment, its most likely because you have an old credit card on file with Amazon. Once its updated, you'll be able to pay.

      1 · August 7, 2014

  • Lauren L.

    Will this be recorded?

    August 6, 2014

  • Chris F

    Tried paying the $1 twice now, and both times it failed. Amazon isn't telling me why this failed. Are other people having problems with this? Thanks.

    2 · July 20, 2014

    • Chris F

      Amazon was using an older expired card, even though they had a good one for me. All set, thanks.

      August 3, 2014

    • Akshat P.


      3 · August 4, 2014

  • Chris S.

    Hey, just came across this earlier in the week. Pretty nifty! More new-media art than powerful tool, but still, maybe potential "Tool of the Month"?

    2 · July 19, 2014

    • Ben S.

      what I meant to specify is that not knowing anything about the cipher still makes it hard to crack, despite how terrible it may be. should people reply solely on the secrecy of a cipher to protect their data? absolutely not. can secrecy of a cipher be combined with a strong cipher to enable defense in depth? yes! the difference between security-through-obscuri­­ty and defense-in-depth is that stripping away layers of security or secrecy in a defense-in-depth system doesn't compromise the data. in a security-through-obscuri­­ty system, all you need to know is their dirty little secret and you can steal their cake and eat it too. however the point you mention about letting experts audit the algorithm still applies.

      1 · July 23, 2014

    • Ben S.

      this begs the question of "how many cryptonerds do you need to hire to audit your cryptosystem so that it's more beneficial to keep the algorithm secret than to publish it". The only organization I can think of that has answered this question is the NSA, who will probably never publish any of their suite A ciphers.

      2 · July 23, 2014

  • Will L.

    Hey Gavin! Any chance you'll be covering cryptographic hashes in your talk?

    2 · June 13, 2014

90 went

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Refunds are not offered for this Meetup.

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