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1 answer

RSA cipher Encryption with $n=210757$ and $a=3$ and Decryption with $n=14659$ and $a=3$

I think I understand correctly how to encrypt something with an RSA cipher, but I am a little lost on how to find the decryption key...(also I apologize for the formatting errors) An RSA cipher is ...

0 answers

Deriving an Expression for Helmoltz free energy

Given the equations of states for an isolated system: $$E=\frac32 pV$$ $$p=aVT^4$$ I was asked to find the Helmoltz free energy per particle, $F=E-TS$, as a function of $T$ and $V$. I began with the ...

1 answer

Java Signature.verify results in SignatureException: Signature encoding error Caused by IOException: Sequence tag error

first of all this is not a duplicate question as most people report this exception when creating a Public Key from a Certificate which is missing "---BEGIN RSA CERTIFICATE---" line. gist of what I ...

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Why is (von Neumann) entropy maximized for an ensemble in thermal equilibrium?

Consider a quantum system in thermal equilibrium with a heat bath. In determining the density operator of the system, the usual procedure is to maximize the von Neumann entropy subject to the ...

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Replacement Cipher

Replacement cipher: Let τ be a permutation of the alphabet, and apply τ to each letter of the message. Frequency analysis is useful for breaking this type of code. Decode the following, which was ...

1 answers | 50 mins ago by Michelle on Mathematics math.stackexchange.com
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Memory Consumption with Encryption, AES

I just wonder if could any one know if the Memory consumed by AES for encrypting a text file will be equal to the memory consumed to decrypt the same file. Thanks.

1 answers | 1 hour ago by Seham HAmmad on Stack Overflow stackoverflow.com
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Hash collision using the leading 40-bits of SHA-1

I am trying to implement Floyd's cycle finding algorithm for finding a leading 40-bit hash collision in the SHA-1 algorithm. However, my code will not find a repetition even with 800,000,000 hashes. ...

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Do I always have to dismount a TrueCrypt volume from my USB? Other encryption software w/ hidden volumes?

I am absolutely new to TrueCrypt. I wanted to encrypt my entire flash drive and used BitLocker for a bit, but then liked the idea of a "hidden volume". I am looking for ease of use (e.g. in BitLocker ...

1 answer

running ECDH with CommonCrypto for iOS

I am looking for the methods in CommonCrypto to generate the shared secret based on ECDH. I can find proprietary implementations but nothing standard. This method is called sometimes Key Exchange and ...

1 answers | 1 hour ago by Simon on Stack Overflow stackoverflow.com
1 answer

Committing Bilinear equation in Groth-Sahai framework

Groth-Sahai framework enables us to commit to QE, MSME, PP equations. Now, is the equation below committable in GS framework? A bilinear map $e: G_1 \times G_2 \rightarrow G_T$. $g_1 \in G_1$ and ...

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Are temporary files an issue when opening and editing an encrypted 7z file?

I am new to security and encryption. I want to store important information like passwords and pin codes so I don't forget them. So far I have been using LastPass but I would prefer a solution I ...

1 answers | 2 hours ago by Kaja on Information Security security.stackexchange.com
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What is the exact meaning of $I(X;Y|Z)$ in Information Theory?

I am wondering: is the notation $I(X;Y|Z)$ used to denote the mutual information between probabilities of $X$ and $Y|Z$ or between $X|Z$ and $Y|Z$?

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Encryption of big files in Java with AES/GCM

I have to encrypt big files. Say their size ranges from 500mb to several of gigabytes. I would like to use AES/GCM/NoPadding as provided by Java 1.8 since that gives me automatic authentication and ...

1 answer

Java: How to handle authenticated encryption for big files

First I need to mention that I can't use BouncyCastle to implement this solution. I have to encrypt files into the file system. Those files are not going to be tranfered over the wire to any other ...

2 answers

Getting chapters to start on a new page in a pandoc-generated PDF

%Title %Author #Header 1 Lots of words. #Header 2 More words. ##Level 2 header The above text can be turned into an EPUB file for e-readers with pandoc -o output.epub input.mkd, and it can be ...

2 answers | 2 hours ago by evilsoup on Super User superuser.com
2 answers

object pdflatex not found on Windows 7

I work with RStudio (version 3.1.2). When I try to Knit PDF in my R Markdown script, I receive the following output: Error in eval(expr,envir,enclos): object 'pdflatex' not found I have ...

2 answers | 2 hours ago by NuValue on Stack Overflow stackoverflow.com
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CBC-MAC, possible attack that violates computational resistance

received this question in an assignment and figured the wizards of crypto.stackexchange could give me some useful and relevant input. Suppose an attacker knows three message/CBC-MAC pairs $(M_1 , ...

0 answers

A multi-script Latex document

This is my first attempt to create a multi-script (English, Hindi, Tamil, Japanese, Slovenian, Latvian, Arabic, etc..) document using Latex. I am using xelatex for that. I don't know most of these ...

1 answer

Stackoverflowerror while running Javadoc

Attempted to Javadoc my group's App project, but got stackoverflowerror. Tried increasing heap space, but that did not seem to help. I've googled this question, but all I've seen are questions and ...

1 answer

Pandoc options to convert LaTeX flavored Markdown to HTML

The aim is to convert a Markdown file (file.md) to a html file (file.html). The Markdown file contains formulas specified in LaTeX specified between two dollar ($) signs. Example: The resulting ...

1 answer

Chapter 17 Blue Pelican Help Encryption/Decryption

I am currently doing a program called Encryption Decryption on Eclipse. I was wondering if someone could help me this is what I have right now. Here is my tester: import java.io.*; import ...

1 answers | 4 hours ago by Blake White on Stack Overflow stackoverflow.com
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Proving correctness of a decryption of a homomorphically summed ciphertext?

I would like to take some additively homomorphic cryptosystem - don't care much which one for now - and encrypt a series of numbers with it. I would then like to (in public) take these numbers, add ...

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LaTeX - tikzpicture - Arrow next to/under plot label

I am looking for a help with Latex. I'm new here so unfortunately I'm not allowed to post pictures yet. I have a tikzpicture plot with labeled axes (x and y). Now I would like to add an arrow below ...

1 answer

Slow AES GCM encryption and decryption with Java 8u20

I am trying to encrypt and decrypt data using AES/GCM/NoPadding. I installed the JCE Unlimited Strength Policy Files and ran the (simple minded) benchmark below. I've done the same using OpenSSL and ...

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Fiddler decrypt from all process causing site to not load

I have fiddler set to decrypt https request. But for some reason, the site I'm trying to check, always fail when I set it to decrypt "from all processes". The decrypt https only seem to work with ...

2 answers

Shifted symbol cipher

This is a cool cipher I determined. It involves lateral thinking, so try it out. The answer is a English plaintext, with the following being the cipher text... Try to decrypt it... or decipher it, you ...

0 answers

Using RSACryptoServiceProvider on Azure web site - file not found error

I am moving an existing (and working) ASP.NET web site to Azure web site. One of the bits of functionality on the site is signing an XML document. The code to get the key is: // retrieve a key from ...

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Encrypt a XML file with XmlCipher (RSA)

I just need to encrypt some XML elements with a public key. I successfully can use this code with a simetric algorithm (XMLCipher.AES_128), but failed when try use XMLCipher.RSA_v1dot5. That is the ...

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What informal indicators exist for estimating the computational infeasibility of cryptographic problems?

When assuming a block cipher primitive is secure, or a number theoretic problem is hard, this assumption is usually based on how far we are from breaking the primitive or solving the problem using ...

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Hybrid fair exchange protocol

A gradual fair exchange (layman term) is a form of fair exchange protocol where Alice will transfer 1 bit to Bob then Bob will transfer 1 bit to Alice. The flaw with this protocol is that the party ...

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