Questions tagged [cryptography]
Questions relating to cryptographic topics such as encryption/decryption and hashing. (Not for use with trivial ciphers.)
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AES GCM C++ implementation
I have written a C++ program that uses the Crypto++ library to encrypt files using AES-256Bit (in GCM mode). I am planning to eventually have the program store the keys for the files in a file e.g. ...
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Encryption algorithm for chat app
I'm working on a CLI chat app using Python and I've coded this encryption algorithm.
I used hybrid encryption.
This uses an AES key as the shared key for encryption and decryption and RSA to encrypt ...
- 27
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Simple Merkle Tree
Discussion
I just started learning about Merkle Trees and wanted to get some practice by attempting to implement a very simple Merkle Tree.
The constructor for the tree takes some type of hash ...
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Encryption and Decryption in C
I have written a program in C, which encrypts and decrypts a c-styled string (const char *) and print the result to stdout. It ...
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Rijndael Cipher in C++ (128bit AES)
I am a hobbyist and do not work in the industry, but I do have an interest in programming an cryptography. I decided to have a go at writing a 128bit implementation of AES in C++. This is my first ...
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Arduino portenta H7 compatible message encryption and decryption
I am looking to build a message encryption/decription method that would allow messages to be encrypted in a timely fashion on board an Arduino Portenta H7, using as much of the onboard hardware ...
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Simple CLI File Encryption
This program is designed to work on the command line by piping stdin to stdout and encrypting or decrypting the input using a symmetric key.
Any suggestions for improvement would be greatly ...
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Kotlin, calculate fingerprint from public key
I created function for calculating fingerprint from a public key
...
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RC4 stream cipher in ARM Assembly
Below is a complete implementation of RC4 in ARM assembly. Unit tests pass, including comparison to C implementation and to published test vectors.
I'm appreciative of all feedback, comments (things ...
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.Net BouncyCastle - PKCS#3, PKCS#8 & PKCS#10 Generation as base64
Reaserching BouncyCastle for C# is not for the faint of heart. After navigating an ocean of Java dead ends, I have arrived at the following code.
I believe it's very useful for someone who wants to ...
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C++ AES Encryption Class
I am working with OpenSSL and writing an AES256 encryption module. My knowledge of cybersecurity is not vast and I would like to know whether there are any obvious holes I'm leaving. The intent is for ...
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My implementation of the Signal protocol for end-to-end encryption in NodeJS and Angular [closed]
I have developed a web app which lets you transfer files from A device to B device, similar to airdrop's concept, working through the server and not peer-to-peer.
I didn't go with a P2P solution ...
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Bash script for pull-mode backups via restic's rest-server
I wrote the following Bash scripts to make pull-mode backups with restic, a backup solution written in Golang, similar to Borg Backup. The main use case for this script is pulling backups into a ...
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833
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Python 3 Playfair cipher encrypter and decrypter
I have written a Python 3 program that can encrypt and decrypt Playfair cipher, though I know it has been implemented countless times, none of the scripts I have seen so far(e.g. https://codegolf....
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Notes Saver Application in tkinter python
I completed my Notes Saver project in python tkinter and now I want to get it reviewed.
I want to how I could -
Improve my hashing system.
Improve my notes encryption system.
Improve the UX.
Improve ...
2
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1
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Manual authenticated encryption on .NET Core
I've been tasked with creating some way to encrypt arbitrary text for a .NET Core app, with the following requirements:
Messages will be between 10 bytes and 1 kB.
Boss doesn't want me to use AES-GCM ...
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Enigma Implementation by Python newbie
I want to learn Python, so I ported a C# Enigma implementation of mine. It got UnitTests and is running.
I'm looking for a review, telling me, where I don't know best practices, where I break naming ...
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Enigma Implementation by JAVA newbie
I want to learn Java, so I ported a C# Enigma implementation of mine. It got UnitTests and is running.
I'm looking for a review, telling me, where I don't know best practices, where I break naming ...
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Is this a true implementation of XOR in python?
I have implemented a simple XOR encryption in Python. However I am not sure this is the right implementation or it can be further improved ?
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Cryptographic hashing class using OpenSSL's EVP interface
I have written a cryptographic hashing class named Ccksum::DigestHasher that allows the caller to select a hashing algorithm by name via OpenSSL's EVP interface. ...
user245257
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1
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encrypt files using a variant of Vernam Cipher in C language
I'm coding this program that allows you to encrypt files using vernam cipher in C language. I would be glad if you could inspect my code and tell me if I can make some improvements to it or if there ...
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Python script to compress and encrypt a list of files/directories (tar + gpg)
I've tried, as practise, to write a Python 3 script which takes a list of paths to files/directories and compresses them with tar, before encrypting the resultant ...
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tokenize char array with PolarSSL library
I'm trying to perform a decryption operation using RSA. I'm using the PolarSSl library. I have a char array key[] that contains RSA private key like the following,
<...
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Javascript client storage with the same persistence as a session cookie
I want to implement a client storage mechanism that is as persistent as a session cookie but with more storage capacity.
I am doing this by encrypting the data before storing it and saving the keys in ...
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Encryption/Decryption algorithm #3
This is a follow up question to Encryption/Decryption algorithm #2 and Encryption/Decryption algorithm.
In my last question, in @Reinderien's answer, he added this line ...
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Encryption/Decryption algorithm #2
This is a follow-up question to this one.
I have tried to implement all the recommended things in the answers (except commenting, and not being OS specific). Again, if you see anything that needs ...
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Creating a class and calling it from other .py files
My objective with this code was to create a class and call it from other .py files. The code itself is working, but I would like to know what could be improved or be better implemented.
I wrote ...
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A simple encryption scheme 2.0
This is a follow up to my previous post.
I've used a BCrypt library to create a key from the passed in password. I then separated out the salt from the hash. The encryption is done using the salt ...
user33306
4
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.Net core string symmetric encryption
I need to store sensitive strings in DB, so decided to encrypt it in a DB and decrypt it at the application layer. And noticed that it is not so easy to find ready to use an example. Please check my ...
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Encrypted text - C# SHA256, implementation
I have a C# application which needs to encrypt string and save the key as a hash. The key is saved as a hash to check the right key has been input before trying to decrypt the message.
First, I have ...
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Caesar Cipher Encryption / Decryption in Python
I'm trying to write a Python program to predict the most likely substitution for a Caesar cipher. I managed to get it working, but it just seems very clunky and slow, especially because I need to ...
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Encrypting/decrypting messages in java
I am trying to implement message encryption/decryption with password in java. Here is the code I'm using:
...
Arseniy Svechkarev
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438
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JavaScript: proper user of SJCL encryption in Google Apps Script
I'm using the minified version of SJCL to encrypt the backup files requested by the users. It is in a Google Apps Script add-on for Google Sheets.
I'm mostly concerned with correct use, exception ...
user235971
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Correct implementation of encryption function
I wrote a simple encryption function that uses argon2d as the KDF and XChaCha20-Poly1305 as the AEAD. Since it is very easy to not get things right when dealing with encryption, I would appreciate if ...
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AES implementation in python
For educational purposes, I have implemented the AES block cipher in python. I decided to follow the interface for block cipher modules as defined in PEP 272. The implementation consists of two python ...
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Encryption/Decryption between Python and Node JS
I have created a Python & Node JS encryption/decryption AES 256-CFB. The point of this little project is that I will encrypt a special URL with Python covered with base64 & URL encoding and ...
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Vigenere cipher C program
I implemented a Vigenere cipher that preserves case and can also decrypt if you pass the -d argument. Usage is ...
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Substitution Cipher in C
I was directed here from Stack Overflow.
I completed my recent programming assignment for developing a substitution cipher in C. Below is what I came up with after reading many tutorials, googling ...
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Python 3 Vigenere Cipher
I'm still fairly new to Python and I'm trying to see if I've efficiently used modules, functions, etc or if there's another/easier way to do something.
This Python 3 Vigenere Cipher is a rebuild of a ...
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Implement kleptography in Python
I'm new here, therefore I hope to be clear in this question. Firstly, I want to underline that I'm not a programmer, and I attended only a beginner course in Python, but I like to solve problems ...
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Very simple encryption API
I need an encryption system with a super simple API. I'd prefer something as simple as the following. The output should also be browser-friendly and ideally url-friendly.
...
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Encrypts a message using the ADFGVX cipher
This is a Java program I implemented to encrypt a string using the ADVGVX cipher. It takes in the message, the passphrase used to generate the Polybius square, and keyword for the transposition part ...
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C++ Crypto: Part 4- Scram
Looking around for modern Crypto libraries.
Could not find anything good.
I know I probably did this all wrong so work with me here. There will be four different reviews for four structures that build ...
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C++ Crypto:Part 3-pbkdf2
Looking around for modern Crypto libraries.
Could not find anything good.
I know I probably did this all wrong so work with me here. There will be four different reviews for four structures that build ...
- 91.5k