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6 answers

Security, Hacking, Cryptography Reading?

I'm very interested in learning about cryptography, steganography, and similar practices. What books, resources, would you guys recommend in this area?

11 answers

How do I prevent replay attacks?

This is related to another question I asked. In summary, I have a special case of a URL where, when a form is POSTed to it, I can't rely on cookies for authentication or to maintain the user's ...

5 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 ...

1 answer

Hacking the Open JDK - Emit LLVM Assembler rather than Java Bytecode

I have got the opportunity to work at the university and to help hacking javac from the OpenJDK. The goal is to read custom sourcecode (for "our" programming language in combination with antlr) and …

2 answers

decrypt text using the encryption key

I wrote a class to encrypt a string with AES : import; import; import javax.crypto.*; import javax.xml.bind.DatatypeConverter; …

2 answers | 2 hours ago by Mohamed Zemzem on Stack Overflow
3 answers

What is the advantage of salting a password hash?

I have just read many, many articles on SO about hashing passwords with salt but I just cannot find an answer to the particular query/confusion I have. Let's say I have just done this method for ...

1 answer

BouncyCastle Rijndael 256 Implementation

I modified the implementation from this website to include a salt: package; import static org.junit.Assert.*; import org.bouncycastle.crypto.BlockCipher; import ...

2 answers

What are Cryptographic Multi-linear Maps?

I've encountered this term many times in the fields of Fully-Homomorphic Encryption and Obfuscation. I want to learn those subject and Cryptographic Linear Maps seems to be an obstacle in the way. …

2 answers

what are the influences after cancelling \hypersetup in org-mode?

I make pdf in org-mode with my own preamble, but the PDF or tex file generated always appear the information resulting from: (format "\\hypersetup{\n pdfkeywords={%s},\n pdfsubject={%s},\n ...

2 answers | 5 hours ago by Zoe Rowa on Stack Overflow
1 answer

Bcrypt, what is meant salt and cost?

I was always using MD5 for encrypting passwords, but I read that it's should no more be used, and instead use bcrypt.. I'm using zendframework 2 , where I found it describing bcrypt configurations …

2 answers

Decoding a weird and possibly malicious PHP code

I am seeing this following code on some of my sites: preg_replace("/lWkTSJcPlD6Ty3nInmjgvJ=vcL/e", ...

1 answer

Creating encryption for cheap secret cameras

I have a friend who uses small, cheap cameras for filming human rights abuses. I am interested in finding a method to write software or firmware to modify standard "gum" secret cameras such as the ...

1 answer

Information gain with numerical data

I'm making a random forest classifier. In every tutorial, there is a very simple example of how to calculate entropy with Boolean attributes. In my problem I have attribute values that are calculated …

1 answers | 6 hours ago by kam on Cross Validated
0 answers

Looking for implementation/detailed description/examples of Key Agreement cryptographic algorithm VKO GOST R 34.10-2001 (described in RFC4357)

VKO GOST R 34.10-2001 was described in But the description is very poor. Here it is: This algorithm creates a key encryption key (KEK) using 64 bit UKM, the …

1 answer

WSSE authentication paradox

I'm currently making some research on the WSSE protocol to secure my api. I've understood the basis and it is clear in my head. However I face to a problem. Let's say I want to generate a ONE-time …

1 answers | 6 hours ago by Trent on Stack Overflow
1 answer

Which encryption technique should be used for cloud computing data transfer?

I want to setup my application for cloud computing for Software as a Service. There is going to be a lot of data transfer between my server and client, to and fro. The technique I have envisaged is: …

0 answers

How can I match encrypted data from 2 sources without viewing the data?

Assume 1) a platform "P" with numerous users 2) user1 has sensitive information in external database "A" 3) user2 has sensitive information in external database "B" 4) A&B information is ...

0 answers

How to type accurate Hindi words in latex…? is there any other method without transliteration?

\usepackage{devnagiri} The word {\dn is jungle me do sher rehte hai} in the above... after compiling.... Hindi is ther but no proper hindi translation. I need to type some hindi words in between ...

2 answers

Asymmetric algorithm for one time signing of small cleartext

I want to generate a key pair such that the private key can be used once to sign a small message (1024 bytes) at some indeterminate point in the future and the public key can be used to verify that …

0 answers

Managing data permissions/access through asymmetric cryptography

I want to manage authorization, as 3rd-party permissions, through asymmetric cryptography. I'm concerned about how is it possible to share access of encrypted data with N entities, and be able to ...

1 answer

protect client side application/scripts against 'hacking'

If you've ever played video games and the sort, you've probably looked up cheats now and then. Sometimes the games don't have cheats built into them, such as games that have a store used for monetary …

1 answers | 10 hours ago by Kiro Yakuza on Stack Overflow
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 | 12 hours ago by Joe on Computer Science
0 answers

Is it possible to design an identity-based key-exchange protocol that has (almost) comparable performance with HMQV and enjoys a tight reduction?

Recently, I'm thinking about a problem that is it possible to design an identity-based key-exchange protocol that has (almost) comparable performance with HMQV, but at the same time, enjoys a tight …

6 answers

MD5 is 128 bits but why is it 32 characters?

I read some docs about md5, it said that its 128 bits, but why is it 32 characters? I cant compute the characters. 1 byte is 8 bits, if 1 character is 1 byte, then 128 bits is 128/8 = 16 bytes right? …

6 answers | 13 hours ago by hash_jr90 on Stack Overflow
1 answer

In HMQV, can one use multiple identities with one public key?

The HMQV protocol has 2 "identity" fields $\hat{A}, \hat{B}$ that are used in the dual signature - and it tries to guarantee that any properly-generated session key is only shared by a single $(A, B, …

1 answer

Proof for composed signatures

Assumes that we have 3 signature algorithms, $S^A$ with key pair $(sk^A,pk^A)$, $S^B$ with key pair $(sk^B,pk^B)$,$S^C$ with key pair $(sk^C,pk^C)$. We denote by $\epsilon$, $\epsilon'$ and ...

0 answers

Crypto++ library for Symbian

I know that this platform is dead, but for the sake of my old phone, I'm building an app for it. My application needs to use the Crypto++/CryptoPP library, I have version 5.6.2 of the library built …

1 answer

How should I treat a new cipher release like Spritz?

I have been looking at both the paper as well as the sourcecode of Spritz — a spongy RC4-like stream cipher and hash function by Ronald L. Rivest and Jacob Schuldt. The paper states We have also …

3 answers

Encrypt/decrypt .plist file ios

i have a plist with some stored data and want to encrypt decrypt so it's not readable using objective c. i've read about AES encryption etc but i want the whole plist to be encrypted some how not the …

3 answers | 15 hours ago by zaabalonso on Stack Overflow
3 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 ...

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