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Small tags/sites


1 answer

Implementing the Mceliece Encryption - making the Generator Matrix

I am working on an implementation of the Mceliece Encryption system (MCE) and the Niederreiter encryption system. I have been through the basics of finite fields, polynomial arithmetic and some coding …

0 answers

Asymmetric algorithm for one time signing of small cleartext

Is there a asymmetric algorithm especially suited for a use case where we only use the private key once, to sign a small cleartext (1024 bytes in my case) and we only use the public key to verify said …

1 answer

Why won't Vim source my .vimrc at startup?

I have modified my ~/.vimrc significantly (although some of my initial modifications I made in the system-wide /etc/vim/vimrc). It probably doesn't matter either way since I am really the only user …

0 answers

Secure Deduplication and Encryption in a data store

Assume: We have a centralized data store that can store whatever we need Every user is online Users can securely communicate Function $f : File \to Key$ gets access to the store, and is the same for …

2 answers

Replicate Java's PBEWithMD5AndDES in Python 2.7

If it's not immediately obvious, let me start by saying I am not a crypto person. I have been tasked with replicating the behavior of Java's PBEWithMD5AndDES (MD5 digest with DES encryption) in ...

0 answers

Implementation in C++ to aes256

recently i try use a gladman library for aes-256(http://www.gladman.me.uk/), i get work encryption and decryption in ecb, but the problem is i can't get the same result what other tool (for example a …

3 answers

Do any non-US ciphers exist?

Plenty of ciphers come out of the USA from government research or selection competitions. AES and DES are examples. Are there any public ciphers produced by other states, China or Iran for example? …

3 answers | 2 hours ago by TruthSerum on Cryptography crypto.stackexchange.com
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xypic on Wordpress

Is it possible to use xypic on Wordpress (for those who don't know what xypic is, it's a LaTex tool for drawing diagrams- see Wikipedia)? On a related note, is it possible to use the LaTeX package ...

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How do I find horizontal vertical and diagonal correlation coefficients in matlab

I have an image which has been encrypted, and then hidden in a cover image. and finally retrieved. I'd like to find the horiz, vertical and diagonal correlation coeff's of the initial image, and the …

1 answer

CryptographicException no line number in stacktrace

I was getting following exception in event viewer with ADFS 2.0 and MVC 4 app configured via Visual Studio's Identity and Access Tool, app running on IIS 7.5 Exception type: CryptographicException …

0 answers

db4o won't save updates with javafx

Preface: I frequent these boards but this is my first question. I appreciate the wealth of information on these boards. So thank you in advance for any help. I have a JavaFX application and I am ...

1 answer

Paypal Encrypted Button, encrypted value

How do you get the value of the encrypted input on the dynamic paypal html form? My server side language is php. Here is my html <form action="https://www.paypal.com/cgi-bin/webscr" method="POST" …

1 answers | 3 hours ago by Dom on Stack Overflow stackoverflow.com
2 answers

Is the second law of Thermodynamics an immense tautology?

Let's imagine for a second a system that is changing constantly from one microstate to another one. It could be a given volume of a gas with its atoms moving and bouncing around, or a deck of cards …

1 answer

remove italics in latex subscript in matplotlib

I would like to remove the italics font that appears when I use subscripts in labels. For example, the "Teff" in the x-label has "eff" in italics. I would like latex not render it in such a way. ...

0 answers

How to decrypt magento 'frontend' cookies?

I have a custom frontend page, and the layout of the page changes depending if you are a fresh new customer, or if you already are a customer. My idea is to use the cookie 'frontend' that magento …

0 answers

Choosing N and E for Javascript RSA Key Generation using JSBN

I'm using the JSBN library found at http://www-cs-students.stanford.edu/~tjw/jsbn/. I'm particularly trying to make the RSASetPublic() call in rsa.js, like this: publicPem = RSASetPublic(N,E); For …

4 answers

Why should I sign data that's already encrypted?

My question is about the difference between signing and encrypting. Why would you still sign something if you are already going to PKI encrypt it? Doesn't the PKI encryption inherently provide ...

0 answers

practically verifying block ciphers strength

How do we verify practically the strength of a block ciphers? Most of the security analysis of block ciphers is usually around theoretical analysis and proofs in some random oracle model etc. For …

0 answers

Change hashing method of mysql passwords

I just noticed that the hashing methods for keeping the passwords of mysql accounts, like the root password are just sha1(sha1_bin()). how secure is that considering you use pre-computed lookup ...

1 answer

Question on Waters IBE

I'm reading “Efficient Identity-Based Encryption Without Random Oracles” by Brent Waters. In Page 9, I don't know how ...

2 answers

Composition of block ciphers and 3DES

There is some intriguing things about DES and 3DES. Now, I know that DES is weak and 3DES was an attempt to construct a more secure block-cipher from a deprecated one. Having this in mind, what ...

1 answer

JAVA: Socket override to use CipherInputStream and CipherOutputStream

Let me explain my problem. I want to override Socket and ServerSocket classes in order to encrypt my messages in this way: 1) Client sends a random generated symmetric key (AES algorithm) to the ...

1 answers | 7 hours ago by Selvaline on Stack Overflow stackoverflow.com
1 answer

Sign file with public and private keys stored on smart card

I develop an application to sign file XML with a public key and a private key stored on a smart card (IAS-ECC). I know that my smart card has two certificates (one used for authentication, one used …

0 answers

Can i trace encoded/crypted script activity?

is it possible to log or trace crypted script, to see what changes it does on my pc? At start there is a sh script that loads custom php extension to php, what decrypts install.php file, then it ...

10 answers

How to verify number with Bob without Eve knowing?

You need to check that your friend, Bob, has your correct phone number, but you cannot ask him directly. You must write the question on a card which and give it to Eve who will take the card to Bob …

10 answers | 7 hours ago by Joe on Computer Science cs.stackexchange.com
1 answer

Is maximizing the Shannon differential entropy equivalent to minimizing the predictability and/or minimizing the maximum density?

For a real-valued, 1-dimensional, continuous random variable X with density f(x), I am trying to determine if maximizing the Shannon differential entropy of f(x) is mathematically equivalent to ...

2 answers

Axioms behind entropy!

The concept of entropy is very ubiquitous, we learn about its uses starting from Information Theory (Shannon entropy) up to its basic definition in statistical mechanics in terms of number of ...

0 answers

IntelliJ's reformat feature adds unexpected line breaks to Javadoc comment blocks

When I use IntelliJ's reformatting feature, sometimes it adds line breaks to javadoc comments in odd places. Here's an example of text before formatting: /** Lorem ipsum dolor sit amet, ...

0 answers

Vevo signature decrypt

Stack! I'm trying to decrypt vevo signature so I can download the videos, I've tried to use this algorithm Best approach to decode Youtube cipher signature using PHP or JS but it failed... here is my …

0 answers

Decrypt string in SQL that was encrypted with .NET

We are encrypting a string using .NET's TripleDESCryptoServiceProvider, shown in the below VB.NET code... then stuffing it into a SQL table (Microsoft SQL Server 2012) We have a need to decrypt the …

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