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Cryptography All Questions
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Removing prefix from figure captions in LaTeX
I'd like to make my own caption inside \caption{} in figures of LaTeX. How can I turn off the "Figure " prefix from the captions that appear?
What key length is required to keep simple keyed “hash” secure?
In a previous question, I described a particular keyed "hash" that mapped a 5-digit input code into a 5-digit output code. It used a 8-bit key which is very insecure - more than 99% of the time, you …
How to prove $H(X-Y)\le \log(2\pi eD)$?
In rate distortion theory, difference error entropy $H(X-Y)\le \log(2\pi eD)$, how can we prove this?
stats.stackexchange.com What else can bitcoin inventory vectors be used for?
As described in the protocol specification bitcoin nodes respond to the inv command, which queries a node's knowledge of one or more objects, with an inventory vector. According to the bitcoin wiki, …
bitcoin.stackexchange.com How do I implement CBC mode?
My problem lies around the AES encryption algorithm and implementing an IV into the algorithm. I have the ECB version of AES working and I have thoroughly tested it. I'm trying to make it more secure …
Boxplot in latex
I am new to Latex. How can I draw a boxplot in latex. My data set is as below index median box_top box_bottom whisker_top whisker_bottom 0 1 1.2 0.4 1.5 0.2 1 2 2.3 1.5 2.7 1 2 0.7 1.4 0.5 1.9 0.1
AES CBC PKCS5 Decryption in WIndows 8 Appstore application
Well its embarrassing to ask this question despite having lot of articles related to this in web, but I could not figure it out.I am struck with this one. I am encrypting a text in Android using ...
How random are comercial TRNGS
I'm thinking about buying an USB TRNG. The question is: How do I evaluate it's randomness ? I'm sure some are better than others but which is which ? Are thermal-noise better than radio-noise TRNGs?
The double-bar delimiter does not stretch in MathJax 2.2
With the recent switch to MathJax 2.2, it seems that the double-bar delimiter (i.e. \|, or \lVert and \rVert) does not stretch when used with \left and \right (on my computer at least). The problem …
meta.math.stackexchange.com com.jcraft.jsch.JSchException: Auth fail
While I upload a file from local disk to a remote server,such exception occured: com.jcraft.jsch.JSchException: Auth fail at org.apache.tools.ant.taskdefs.optional.ssh.Scp.execute(Scp.java:215) I …
Pasting $\LaTeX$ into a Mathematica notebook
I have read that $\LaTeX$ source can be directly pasted into a Mathematica notebook. However, I have been unsuccessful in this regard. An example of the errors received are: $\frac{1}{2}$ ...
mathematica.stackexchange.com How to use $\LaTeX$ for typesetting labels and titles in Mathematica
I need to typeset large number of equations to be used for PlotLabel and Titles and such. These have to look nice. Hence I use TraditionalForm with HoldForm and this works well, except for a tiny ...
Unable to convert $\TeX$ input into mathematica
The input ToExpression["\\sqrt{x y}", TeXForm] gives me the $Failed output. Maybe my very old computer is the problem, but that's the only command that has caused me problems, and that input is …
are any people facing problem of not loading latex symbols?
are people facing problem of not loading latex symbols in MSE? I have high speed internet connection but I am facing this problem from yesterday,any suggestion?It says "math processing error" if my …
What is the recommended replacement for MD5?
Since MD5 is broken for purposes of security, what hash should I be using now for secure applications?
Understanding shannon entropy of a data set
I'm reading Machine Learning In Action and am going through the decision tree chapter. I understand that decision trees are built such that splitting the data set gives you a way to structure your …
Can we get a $\LaTeX$ button?
I would like to propose the addition of a $\LaTeX$ button. It would be very similar to the "code" button that formats the highlighted text into code, the $\LaTeX$ button would surround the highlighted …
Error decrypting in java
I'm trying to encrypt/decrypt a String in Java. No problem concerning the encryption then stored a in sqlite table. But I always get the same error trying to decrypt it : ...
How to use futures with Akka for asynchronous results
I am trying to write to multiple files concurrently using the Akka framework, First I created a class called MyWriter that writes to a file, then using futures I call the object twice hopping that 2 …
Are there any known incompatibilities for SecKeyRawVerify with iOS 4.3 and iOS 5.0
I am trying to verify a data with a public key, using the exact method mentioned on http://blog.flirble.org/2011/01/05/rsa-public-key-openssl-ios/. I tested my code with simulator iOS 6.1, iOS 4.3 …
Java SE strong cryptography for Java 7?
The preview release of Java 7 seems to be missing JCE package for unlimited cryptography strength. Has someone stumbled upon such?
Physical Level Encryption
What types of algorithms that are capable of signing a message are out there that run on a physical level, e.g. lacking the infrastructure of a standard PC, no memory, processor or motherboard in the …
Are there any hand ciphers not obsoleted by computer cryptanalysis?
Computerized cryptanalysis has obviously made formerly "secure" hand ciphers like Playfair, Four Square, and the Hill Cipher obsolete because they can be defeated in seconds. But is there a hand ...
Is this algorithm secure?
I recently found this site, proposing a hashing algorithm for passwords. They describe the following: pad the password on both sides with SHA1(email) to 4 * length(password) HMAC(padded password, …
Is Base64(SHA1(GUID)) still unique like the original GUID?
Basically what the title is; GUIDs are unique by design. If you run the GUID through SHA1 and then Base64 the hash, will the resulting string have the same guaranteed uniqueness as the GUID, or not?
Use JSch to put a file to the remote directory and if the directory does not exist, then create it
I would like to copy a file to the remote directory using Jsch library and SFTP protocol. If the directory on the remote host does not exist, then create it. In the API doc, ...
Convert a LaTex formula to a type that can be used inside SymPy
I want to parse LaTeX formulas and directly use them as SymPy expressions. In other words, what I need is something similar to sympify: from sympy import sympify f = sympify('x^2 + sin(y) + 1/2') ...
Cipher Output and Input Streams
I'm attempting to store some encrypted data in the Android filesystem. I'm getting errors I don't understand and empty files. Please help. Code: private Cipher cipher; private ...
Mathematical formula cause google chrome to hang?
I'm using mac, previously everything it's ok. Just recently I noticed that if I open a post with mathematical formula, or if I try to write one in "ask question" , Google Chrome browser hangs. my ...
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