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    Cryptography Good resources to start cryptography

    April 06, 2019

    Cryptography Good resources to start cryptography

    Good resources to start cryptography

    Posted: 05 Apr 2019 12:09 PM PDT

    Hey

    I was looking for some good resources to start learning about cryptography, you know the basics

    Like books or online courses or videos or blah blah doesn't matter

    submitted by /u/behdad_es
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    Decryption for some symbol between text

    Posted: 06 Apr 2019 02:25 AM PDT

    I mate give me a task to decrypt a text on his webpage, it was normal paragraph written there and was asked simply to decrypt. When I went into the source code, there were &nspb; (non-breaking spaces) between letters randomly and lots of repetition. For example:

    it   was time of darkness, it was   time of brightness. And much more with   randomly placed between letters.

    I tried much but cannot figure out the how that text can be decrypted.

    Really sorry if I leave something and for may be silly question, being a noob just started to learn things in cryptography.

    submitted by /u/sajaljain_syd
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    Implementations of VSS schemes

    Posted: 05 Apr 2019 04:54 AM PDT

    As part of my project in a Cryptography course, I'm supposed to implement a Verifiable Secret Sharing scheme. I came across Feldman, Pederson and Benaloh's scheme and am inclined towards Feldman or Pederson's scheme since they aren't interactive.

    I'm searching for implementations of VSS schemes, preferably non-interactive, to use (we are allowed to use any library required) or at least refer. Would also appreciate if someone could point me to a few resources or libraries commonly used for implementing cryptographic primitives (python, C++ or Java).

    submitted by /u/redreaper99
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    ED25519 public key has at least 20000000000000000000000000000000000000000000000000000000000000000000000000000 corresponding expended private keys ?

    Posted: 05 Apr 2019 02:15 PM PDT

    I have bean playing around, trying to figure out how things works.

    I came into conclusion that answer is positive on question from title.Is this known behavior?

    Edit:

    I provided an test case easy to run.

    https://github.com/z-ninja/ed25519-ekmp

    Hope someone would have time to explain this behavior.

    ​

    I guess that probably implementation of ed25519 is not good enough implemented in practice.

    Btw @stablelib/ed25519 is compatible implementation with any ed25519 implementation widely used on the internet. Example Tor uses same implementation but with expanded keys, which corresponds with my modifications of @stablelib/ed25519.

    Edit:
    I get it.
    ed25519 uses 255 bit private key which is derived via sha2-512 hash of seed where first 32 bytes are used as private key and other 32 bytes in signing process so it leaves 2255 different nonce's (if I can call it nonce) for signing to be used if needed.

    Sorry for this newbie question.

    ​

    submitted by /u/zninja-bg
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    I want to crash the browser tab for most bots but leave it working for most Humans. What do you recommend? For example something similar to eval("if(Math.random()<.01) while(true); true;") but which it cant be adjusted for in the design of a mindless automaton?

    Posted: 05 Apr 2019 05:54 PM PDT

    I would never intentionally hurt someone's data or hardware, but I do want a kind of captcha.

    Also I want it to verify they took the risk of crashing (or risk of wasting a very large amount of computing power), instead of not evaling the potential infinite loop. Since halting oracles are mathematically impossible, I'm on solid ground of there being some kind of scary shit could be built.

    submitted by /u/BenRayfield
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    I am behind. I’m in an encryption course and we don’t need code. I know I haven’t learned as much as I should.

    Posted: 05 Apr 2019 09:25 AM PDT

    I have a book called cryptography engineering, design principles and applications. I'm getting a b in this class and I don't know a lot still. I would like to re go some of the material or atleast part of it in the summer.

    All I've been doing is writing off the PowerPoints, which I will save.

    I just don't know how to spend my time over the summer I want to learn more

    I need an easy course or atleast a course that explains stuff easily. Will reading this book help?

    submitted by /u/prehistoricgz
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