Questions relating to cryptographic topics such as encryption/decryption and hashing. (Not for use with trivial ciphers.)

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4
votes
1answer
97 views

Encrypting strings in Golang

This is a an example application for testing some encryption and decryption functions in Golang. The functions encryptString(), ...
0
votes
1answer
80 views

Implementation of authenticated encryption

My application needs to implement authenticated encryption using C#. There is a .NET class called encryptAndAuthenticate, but it is only supported on windows 8 or ...
1
vote
2answers
102 views

Encryption algorithm using CTR mode

I am using CTR mode (it is a cipher in itself) in this code. I just wanted to see what you thought about it before I finish it. (Yes, I know that the plaintext length and key length must be highly ...
3
votes
2answers
51 views

AES and RSA using javax.crypto

So I am assuming that I did something wrong, and my AES and RSA encryption and decryption classes are insecure. I plan on using them for a larger project, and want to make sure I didn't completely ...
2
votes
0answers
79 views

LockBox TwoFish string encryption and decryption

I'm using TurboPower LockBox for the first time, and using the TwoFish algorithm to first encrypt a password, and later retrieve the password by decrypting the generated hash. I would like to know ...
1
vote
0answers
50 views

XOR 256 Block Encrypting and Decrypting

I am quite new to Go but have found it to be very useful for my use case (game server). I have a routine that encrypts/decrypts the game packets which was written in C++ which can be seen here and ...
3
votes
2answers
48 views

Finding a pair of words from two files with a particular MD5

I have two txt files. Both contain 60k+ words in a list. I put together some code to loop through each file and concatenate the strings ...
5
votes
1answer
217 views

Encryption Algorithm in C#

I'm coding a "encryption" algorithm for learning and and don't know how good is it or how could I make it better: ...
-3
votes
2answers
52 views
6
votes
1answer
261 views

BouncyCastle implementation with X509Certificate signing, KeyStore generation, and Socket creation

The following is a (somewhat messy) implementation of the BouncyCastle cryptography library. I create a self-signed certificate (hopefully correctly), store it in a Java KeyStore, and use it to create ...
0
votes
0answers
28 views

PBKDF2 and HMAC implementation in Scala

First of all: I know that rolling your own cryptographic functions is bad. The SHA256 implementation i use is from Bouncycastle, but i think both HMAC and PBKDF2 are not vulnerable to timing attacks ...
1
vote
2answers
118 views

One Time Pad algorithm for encryption and decryption

I have written my own one time pad algorithm for encryption and decryption, but I would like to listen to your opinions about its correctness and eventually how could I improve it. My idea was to keep ...
1
vote
1answer
250 views

Secure RSA encryption with PyCrypto

I'm coding a very simple reverse shell in python, and I want to encrypt the communication between the server and the client. The idea is to exchange an AES key using RSA then use it to encrypt ...
11
votes
2answers
199 views

Diffie-Hellman in JavaScript

Diffie-Hellman is a key exchange that allows 2 people to share a symmetric key without interaction beforehand. First, a person shares an equation; in this case, we use: $$3^x \mod{17}$$ Next, each ...
7
votes
5answers
786 views

XOR encryption program in C

I've written a program that encrypts files (or stdin) with a user-specified key from 1 to 255. This "encryption" is very insecure, but still a bit better than ROT13 ...
10
votes
3answers
144 views

What an Enigma! (Machine Simulator)

I've made this some time ago for an assignment and I was wondering how it could be improved both in terms of performance and best practices for C code. ...
5
votes
1answer
112 views

Custom encryption

I made a custom encryption library/class which allows to en-/decrypt Strings with a custom charset. I think you'll get what I mean with that when you take a look at ...
4
votes
2answers
345 views

Java conversion of base 16 to base 64

I wrote a solution in Java to solve the problem here. I use BigInteger to convert first from base 16 to base 10, then base 10 to base 64. This seems quite ...
3
votes
1answer
46 views

Sorting dictionary according to letter patterns

I've written a JavaScript dictionary sorting algorithm, which takes a .txt file (the dictionary), and loads it via node's file system. The purpose of this algorithm is to sort every word into its ...
7
votes
1answer
167 views

Encrypt message for sending over non secure network

wRecently needed to swap keys with a colleague on the other side of the country. This script encrypts a file using the other persons public key that is stored on github. It outputs a script that will ...
3
votes
3answers
236 views

Checking an MD5 of a device

The point of this code snippet is to calculate and compare an MD5 obtained from a USB device connected to the computer against a database to check its validity. ...
4
votes
2answers
189 views

BouncyCastle Diffie Hellman

I want to write a complete diffie Hellman example for bouncy castle that includes key generation, key exchange, encryption, and decryption. I also want to verify that if Alice is initiating a ...
5
votes
2answers
111 views

Hashing user passwords

I've written a Java class that will provide the utility of, in essence, hashing user passwords for an Android app that integrates Couchbase mobile into it, and then, checking whether or not the ...
4
votes
2answers
211 views

An AES Cryptography Wrapper

I built this wrapper over the System.Security.Cryptography.Aes encryption/decryption so that one need only instance the class and call the appropriate methods. This makes it much simpler to work with ...
4
votes
3answers
317 views

Cipher decryption and encryption

I'm brand new to C# and I've started to make a cipher decryption program. The code works and runs fine, apart from the odd exception. I'm just looking for ways to improve my code and make more ...
2
votes
2answers
80 views

A hash-signature-type which tests on comparing against normal strings

I decided to throw this together today figuring it would be cool to add to my repertoire. Before we always had performed this "task" externally. Find the value we want to compare, hash it and compare ...
3
votes
2answers
73 views

Program to retrieve key/message from a multiple times used one time pad

I wrote a program to retrieve the key/messages from 10 different ciphers which were all encrypted with the same key with an xor one-time-pad method via crib dragging. To do this, I wrote a python ...
2
votes
1answer
78 views

T-SQL Constant Time Comparison

Explanation is in the function. Please point out any egregious errors: ...
3
votes
2answers
54 views

Getting a hash string for a very large file

After reading about large files and memory problems, I'm suspecting that my code below may be inefficient because it reads the entire files into memory before applying the hash algorithm. Is there a ...
5
votes
2answers
219 views

Simplified DES encryption

This is one of my first Python scripts and I was wondering if it meets the correct conventions. Also are there things that you would write different? I am looking for some good comments so I can start ...
1
vote
0answers
24 views

T-SQL Totp (Rfc6238 SHA2_256) Implementation

Using my previous function as a base I've come up the following: ...
4
votes
1answer
124 views

MD5 hash generator

I made this code for a simple WinForm for my school project where I want to add other hash and encryption algorithms. I have made it following the algorithm of the official RFC 1321 and the Wikipedia ...
2
votes
2answers
105 views

Encryption wrapper

I am writing an encryption class using Crypto++. The idea is that the client connects using RSA (encrypt, decrypt) with username, password, 32 byte key. The server will then return using the stream ...
3
votes
0answers
45 views

T-SQL Pbdfk2 (Rfc2898 SHA2_256) Implementation

Using my previous function as a base I've come up the following: ...
4
votes
0answers
100 views

T-SQL Hmac (Rfc2104 SHA2_256) Implementation

I'm trying to implement an Hmac in T-SQL using this question as an guide. Please critique this: ...
2
votes
2answers
73 views

Encypt XML file with AES and storing on disk

I have written some code to encrypt XML and then store it on the disk. I want to be sure that the encryption code is secure, so here is the code: ...
10
votes
2answers
129 views

Enigma machine simulator

As my first (keep that in mind!) Haskall program (full code at end) I've written a simple Enigma machine and would like feedback on the core code related to its stepping and encoding — stripped of ...
2
votes
1answer
157 views

Secure array encryption and decryption

I have written the below class which encrypts and decrypts a PHP array. The encrypted data and the hash are sent over an insecure connection and I would appreciate if you could check the code for any ...
1
vote
1answer
66 views

Passwords storage class

I'm writing a tool, to manage our application, specifically to store passwords in encrypted view. I made a class which is based on two posts: ...
5
votes
3answers
133 views

Cryptoanalysis of Vigenere-ciphered text with Kasiski test

I am creating a program that will analyse encrypted text using Kasiski examination in order to find possible key length: ...
2
votes
2answers
483 views

Simple stream cipher encryption/decryption function

This is a Python implementation of a stream cipher encryption algorithm. This implementation originates from the one displayed on the TI-Basic wikidot cryptography page. I am well aware that this ...
6
votes
1answer
98 views

Password building and verification

I'm building a library for myself to use to store user passwords. The library itself shouldn't do the retrieval of data, but it should provide container classes for the data. I would like to know ...
8
votes
1answer
292 views

Encrypting a binary stream with RSA + AES in counter mode

I'm writing a little script that encrypts a file using the user's SSH identity. I read the RSA private key from ~/.ssh/id_rsa (default) Use the private key to ...
3
votes
1answer
66 views

Steganographic message hiding

This code hides a message in an image by altering the blue values in the top left part. This is just for fun as I think it would be easy for a cryptographer to find and decrypt this. Original With ...
16
votes
3answers
688 views

Enigma machine simulator - improving recursive algorithm performance

I'm new to Haskell and am confused by why my code seems to preform so poorly, and wonder if there's something I've not grasped about the coding philosophy behind the language, or the best way to take ...
5
votes
1answer
239 views

Salsa20 stream cipher implementation

I have implemented the Salsa20 stream cipher as an ICryptoTransform. It runs fairly fast and has successfully encrypted and decrypted all of my tests. I would ...
3
votes
1answer
89 views

PHP password encryption algorithm

I've written a password encryption algorithm in PHP, which (I think) is not very vulnerable to rainbowtable attacks. It's just that I don't have a lot of experience with encryptions, nor PHP. But from ...
10
votes
3answers
1k views

AES implementation

We are using an outdated 3DES algorithm for encryption and I have been tasked with writing a new implementation using AES with a 128bit shared secret. I would like to know if there are any security ...
9
votes
2answers
330 views

Password hashing and matching

I took information from a series of posts and some prior knowledge to implement the following hashing algorithm. However, there is a lot of talk about what implementations are secure and not secure. ...
3
votes
0answers
109 views

Mifare AES-128 symmetric key diversification

I have implemented a symmetric (AES 128-bit) key diversification algorithm for Java following the NXP Notes. It works as expected but am not the best Java programmer around, I guess I have done quite ...