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    Tuesday, July 31, 2018

    Cryptography My findings on extracting entropy from mouse movement events

    Cryptography My findings on extracting entropy from mouse movement events


    My findings on extracting entropy from mouse movement events

    Posted: 30 Jul 2018 01:33 PM PDT

    First year software student looking to get into cryptography

    Posted: 30 Jul 2018 11:10 AM PDT

    I finished my first year of software engineering and part way through the summer I started making an encryption program using C++. So far the program is able to read a file to be encrypted or decrypted using a simple encryption algorithm. There is a menu for the user to choose the working directory for the file read/write, enter the file name and whether to encrypt or decrypt.

    I had an intro to computer security class that I found very interesting but that class in particular did not involve much coding. I'm looking for some suggestions to improve my project or even ideas for a new one.

    submitted by /u/SeanJOB
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    Failed transactions with XMSS

    Posted: 30 Jul 2018 12:17 PM PDT

    Quite possibly a dumb question, but XMSS uses a One Time Signature (OTS) scheme that can only sign one message with one key. If the message fails to be delivered and you send it again. It automatically sends the original transaction unmodified am I right? It would be impossible that the second attempt to send the message would be signed with a second WOTSignature connected to the same private key? Making it less secure since it's based on WOTS and each WOTS publishes some part of the private key, they rapidly become less secure as more signatures created by the same public/private key are published.

    submitted by /u/QRCollector
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    Is Forward Secrecy different from Perfect Forward Secrecy?

    Posted: 30 Jul 2018 05:46 AM PDT

    Hello r/crypto!,

    I've been reading about Perfect Forward Secrecy and although I understand what it is, I am not sure if Forward Secrecy is the same or something else...

    Wikipedia says:

    In cryptography, forward secrecy (FS), also known as perfect forward secrecy (PFS)

    However, other sources, for example https://scotthelme.co.uk/perfect-forward-secrecy/ claims that those are not necessarily equivalent:

    Any Diffie-Hellman key exchange will provide you with Forward Secrecy, but you should only select Ephemeral key exchange to obtain Perfect Forward Secrecy (a brand new session key for every session).

    I like to use precise and correct terms so could you help me understand the differences? Appreciated if you can provide source or reference as well.

    submitted by /u/Khal_Mazzar
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    Would a Winternitz one-time signature (WOTS) based public/private key be breakable after just 2 published signatures?

    Posted: 30 Jul 2018 02:46 AM PDT

    "An important property of WOTS is that they are secure when only a single signature is published for a private/public key pair. Because each WOTS publishes some part of the private key, they rapidly become less secure as more signatures created by the same public/private key are published." I was wondering how rapidly that is. Would it be unsafe after 2 published signatures in the sense that it could be broken in a small timeframe? Or does this only becoe a problem when quantum computers become player in the game?

    submitted by /u/QRCollector
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