Questions tagged [aes]

Advanced Encryption Standard (AES) is a cryptographic block cipher algorithm.

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13
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3answers
3k 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We are using an outdated 3DES algorithm for encryption and I have been tasked with writing a new implementation using AES with a 128bit shared secret.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 ...
6
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2answers
440 views

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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2answers
178 views

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 ...
3
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1answer
140 views

AES GCM Encryption Code (Secure Enough or not)

I am creating one library for encryption/decryption using AES-256 with GCM Mode(With Random IV/Random Salt) for every request. Code I have written is(reference : AES Encryption/Decryption with key) : <...
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1answer
456 views

PyCrypto AES-CFB with SCrypt and HMAC

I am brushing up on my Python, and since I would like to learn a bit about encryption, I figured I would give PyCrypto a try. I obviously wouldn't implement encryption in any production environment, ...
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2answers
1k views

C# AES Encryption/Decryption or byte[] array with a custom Key/IV

I wanted to create an AES encryption service which will use a custom key/iv. I want 2 methods: dycrypt/encrypt byte[] The code works as expected, any remarks/issues? ...
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1answer
514 views

Password hashing (PBKDF2) and RSA encrypt + AES 256 in Java

Here's what I could comprehend in C code: Generates a key using PBKDF2 Generates an IV which is MD5 of PBKDF2 key in step #1 Does AES-256 encryption on customer-id - which is one of the output RSA ...
2
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1answer
211 views

Proper use of .NET Framework's AesManaged class

My co-worker and I have been tasked with encrypting and decrypting text data using AES256. However both of us feel quite uncomfortable with this as this sits squarely outside our normal problem ...
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2answers
177 views

Securely implementing AES/RSA hybrid crypto with PyCryptodome

I wondering if anyone could give me feedback on whether or not this is a secure way to implement AES/RSA hybrid encryption and signatures in python 3 with the PyCryptodome module. All of the encoding ...
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1answer
7k views

Encrypt Using AES

I'm using Microsoft's example for encrypting/decripting a string. In their example, they are using Tripple DES. I'm trying to convert their code to use AES. The modified code, listed below, works. ...
5
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1answer
654 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 ...
4
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1answer
602 views

AES encryption class

I am new to encryption and recently wanted to learn more about it. I researched how to do AES Encryption in java and assembled my own Java AES encryption class. I don't know if there are any major ...
3
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1answer
1k views

ISO mode encryption/decryption with BouncyCastle

I need to implement an ISO-mode encryption/decryption library in C# using BouncyCastle. In this mode, users only need to exchange their RSA public keys to securely communicate. Operation is as follows:...
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3answers
4k 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 ...
2
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1answer
1k views

Java Cryptography AES/GCM/NoPadding without IV

I'm implementing a PAKE-protocol as a university project and one step of the protocol involves sending encrypted data from a key created via a hash function (I'm using SHA-256). I want to use AES/GCM ...
2
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2answers
204 views

Encrypt data before sending it to server in a way that makes it unreadable to anyone except the user who sent it

I don't have any experience in cryptography and I've written some crypto code that seem to be working, but I'm not sure if it safe and if the tools and methods I used are right. Objective Make it ...
8
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1answer
4k views

Java AES-256 GCM file encryption

I wrote my first file encryption program, that encrypts a file with AES-256 GCM and stores IV and salt prepended to the file content, so it's likely that I did something worse than possible. I ...
2
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1answer
2k views

AES-256-CBC encrypt and decrypt files in Python

I wrote a simple algorithm to encrypt and decrypt files in Python using aes-256-cbc. ...
2
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1answer
114 views

Validate implementation of ECIES

I've created a basic implementation of ECIES (Elliptic Curve Integrated Encryption Scheme) based on http://www.secg.org/sec1-v2.pdf section 5.1. ...
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0answers
75 views

Custom mini cipher

I'm a 14year old and still learning. I know everyone says "don't roll your own crypto", however I decided I must make my own cipher in javascript as soon as I have enough knowledge. I started simple ...
7
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1answer
424 views

CypherVault - Command Line Password Manager

I have created a Python 3 password manager for API keys and social media passwords on local storage. The script is 500 lines and PEP8/PYLINT compliant, each definition contains a docstring and the ...
2
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1answer
771 views

Java RSA / AES-GCM encryption utility

I wrote a utility class that has simple methods for: En/decrypting data with 256-bit AES-GCM using a password Generating RSA keypair Saving RSA keypair and storing private key encrypted En/decrypting ...
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2answers
62 views

Decrypt multiple 10Mb files with defined password

One operation of my Android project is to decrypt one file (chosen in a set of ~30 files for pagination1) of ~10 Mb each and I do this with the following: ...
7
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1answer
75 views

File(s) encrypter implementation in python

I'm looking for any feedback in order to improve code styling, performance etc. Also I want to make sure that the way I've implemented AES here is actually secure ...
3
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1answer
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CliwPw - Yet Another Python3 Password Manager

I wrote a (very) simply Python3 password manager to familiarize myself with Sqlite3, and for fun. I am aware that there are already a variety of password managers out there, but I wanted something ...
4
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1answer
322 views

Python Secure Implementation Of AES-256-CTR Using Cryptography.Hazmat

I've implemented a wrapper for AES 256 CTR mode using the cryptography.hazmat module, I am wondering if there are any vulnerabilities in my implementation, specifically about the counter and its ...
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2answers
212 views

C# Cryptography Interface

C# lacks a common off-the-shelf encryption and decryption interface for dependency injection. Nearly every codebase I've ever opened has a couple of extension methods for hashing strings and so on. ...
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0answers
349 views

AES encryption/decryption in rust: performance and best practices

I wrote a small rust library available on github that can encrypt/decrypt a 16 bytes block using either 128, 192 or 256 bit passwords. This implementation is tested with the test data provided in the ...
6
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1answer
7k views

C# AES Encryption random IV per file

I've made some improvments on the code from : Csharp-AES-bits-Encryption-Library-with-Salt saltBytes is now the SHA512 of the password. Random IV for each encryption call. ( IV length 16 is added to ...
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0answers
63 views

Using System.Security.Cryptography.Aes to generate encryption key

Is the below method a safe way of generating a random encryption key to be used with AES (SymmetricAlgorithm) in .NET? It essentially piggybacks off of the Aes alg to create a random key, trimmed to ...
0
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1answer
96 views

employing AES algorithm in Java

I have employed an AES algorithm in order to encrypt files within a GUI. I was wondering if my algorithm is secure. Could I change anything to improve it? Is my IV secure and is it producing different ...
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3answers
8k views

Python password manager

I am writing a python password manager, and I know there's a lot of scrutiny that goes into storing passwords (don't worry, mine aren't plaintext). I was hoping that this community could help me ...
2
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1answer
160 views

Encrypts using AES GCM for data with limited visibility and long rest

This is the third iteration of my venture on creating an encryption/decryption solution. I asked a question here, which led to this question here, which led to this answer here, which led me to ...
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1answer
317 views

Encrypts using AES with random initialization vector meant for data with limited visibility and then long rest

I've done some research, reviewed countless SO questions that appeared similar, leading me to endless rabbit holes. My solution is working, but I don't like it. I want to create a random IV for AES ...
2
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1answer
217 views

AES CTR mode encryption with HMAC

I am trying to implement AES CTR encryption mode with HMAC authentication for messages. It's encrypting and decrypting fine as long as the key length is 64 bytes, since AES key and HMAC key are ...
3
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1answer
1k views

AES GCM Python implementation

I've recently started looking into encryption in python and I came across with pycryptodome library. I made this simple program that encrypt/decrypt a file using AES-GCM. Could someone take a look if ...
1
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1answer
64 views

Rijndael S-box for a string of bits

My question is more of a "can someone give me tips" rather than "can you do it for me" I have been writing a C code implementation that takes a 32-char String in the form of binary (supposed to act ...
1
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1answer
74 views

Encrypt data to be send from service to service

I'm working with another company in a new application for my company. My job right now is to send on demand to the other company the data that they need, ciphering some of it. I should point out that ...
2
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2answers
442 views

Basic AES/CBC implementation in Java

A little bit about myself: I am 18 years old, a student living in Germany and currently working on an android app. I would like if someone has the time to review my code. I am especially interested ...
0
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1answer
39 views

Shell POSIX OpenSSL file decryption script follow-up #3 (final)

From original very simplistic code: Shell POSIX OpenSSL file decryption script I learned a lot both from the first follow-up review, and the second one as well, many thanks! I just need one final ...
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1answer
51 views

Shell POSIX OpenSSL file decryption script follow-up #2

This question is the second follow-up of: Shell POSIX OpenSSL file decryption script The first follow-up was: Shell POSIX OpenSSL file decryption script follow-up #1 Both of which have proven very ...
6
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1answer
791 views

Shell POSIX OpenSSL file decryption script

Tonight, I tried to write a Bash OpenSSL file decryption script. Encryption script will follow in highly similar manner, so I think it's not necessary now. Let's suppose we have an encrypted large ...
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1answer
110 views

Shell POSIX OpenSSL file decryption script follow-up #1

This question is the first follow-up of: Shell POSIX OpenSSL file decryption script Please read it before you continue reading this. Thank you. I only have one new problem solved and I would like ...
6
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3answers
3k views

Java AES CBC encryption/decryption

I've looked at multiple examples of Java AES CBC mode encryption but I couldn't find a proper solution that's safe to use. I ended up writing my own utility class. My questions is: Is this code safe ...
37
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6answers
19k views

AES Implementation in C++

I've implemented AES (128, 192 and 256) in C++ and I'm looking to improve the code to make it not "DIY-crypto-bad", if at all possible. I've also been trying to optimize my code, and so far I've ...
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2answers
174 views

Long-term archiving + encrypting shell script

Yesterday, I very quickly, in an hour, wrote the very first version of my long-term archiving + encrypting shell script. I am aware it may have too many flaws, but none of them really prevent it from ...
3
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2answers
121 views

JSafebox - Encrypted vault - 2nd drill

I am developing JSafebox, a portable safebox project written in Java. A first review have been completed here. The goal is to provide a secured environment where the user can browse encrypted files ...
3
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1answer
3k views

Java AES file encryption/decryption

I've written a simple Java class to encrypt and decrypt files using AES. The code works and I'm able to encrypt and decrypt files. However, I understand this is an easy way of implementing AES and ...
8
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2answers
208 views

Encrypted safebox

I am developing JSafebox, a portable safebox project written in Java. The goal is to provide a secured environment where the user can browse encrypted files without leaking data on the drive. The ...
8
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3answers
4k views

File encryption with password

I would like to have my C# cryptography code reviewed. I programmed an application that encrypts files with a password (provided by the user). It basically functions as a password manager, on the ...