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

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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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1answer
46 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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2answers
76 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 ...
2
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1answer
49 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. ...
2
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0answers
70 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 ...
2
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1answer
67 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 ...
7
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1answer
230 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 ...
1
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2answers
59 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: ...
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1answer
105 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 ...
8
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1answer
65 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
54 views

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
88 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 ...
4
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2answers
115 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. ...
1
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0answers
160 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 ...
0
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0answers
47 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 ...
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1answer
93 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
4k 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
50 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 ...
1
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1answer
79 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 ...
3
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1answer
572 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 ...
2
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1answer
113 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 ...
1
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1answer
57 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
71 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
314 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
27 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
47 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 ...
1
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2answers
170 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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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 ...
3
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2answers
119 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 ...
8
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2answers
178 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 ...
4
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2answers
3k views

AES File Encryption / Decription VB.NET

I've been looking for a while for the right code to encrypt/decrypt files with AES in vb.net. I created the code below. Is this the right way doing AES encryption/decryption nowadays? ...
7
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1answer
1k views

Encryption and decryption on streams using AES CBC + HMAC SHA

The goal of the code below is to: Support authenticated encryption using AES in the CBC mode and using HMAC SHA. Support encryption and decryption of data of size larger than memory (potentially). ...
4
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1answer
327 views

Plain Java Encryption with Integrity and Authenticity

I spent quite some time and wrote a single class for the purpose of encrypting/decrypting plaintext bytes with a passphrase. The goal is to not have any further dependencies apart from ...
2
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1answer
5k views

AES Encryption/Decryption with key

Is this the best way to encrypt/decrypt data? And Is it good to store Generated InitVector and CipherText in database as Base64 String which is converted from byte[]? ...
6
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3answers
2k 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 ...
1
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1answer
92 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 ...
5
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1answer
628 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 ...
3
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0answers
395 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, ...
3
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0answers
2k views

File encryption/decryption in Python

How secure is this Python code? Can there be any attacks on this encryption? I tried to follow all the rules that I could find: KDF instead of hash, EAX (authenticated encryption mode) and other. <...
1
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0answers
549 views

KDF computation using CMAC with AES (as PRF) using Bouncy Castle C# library

Using bouncy castle .net implementation (version: 1.8.1.0), I am trying to create an encryption key from a known master key using a key derivation function. The NIST Publication 800-108 contains ...
2
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2answers
1k views

Twofish implementation in C++

I have implemented the Twofish algorithm in C++ with an OOP approach, separation of concerns and RAII idiom for the session keys and S-boxes. I have also followed Bruce Schneier's advice and my ...
36
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6answers
15k 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 ...
5
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1answer
365 views

Simplified encryption API wrapper for RSA and AES

I'm working on an encryption library to simplify how my team uses encryption for api credentials and receiving encrypted messages from other teams/projects. This code is wrapping java.security and ...
8
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1answer
3k 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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0answers
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:...
2
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2answers
2k views

C# AES256 CBC Implementation

I was looking for a proper implementation of the AES256 encryption in C# but didn't find anything I was entirely satisfied with, so I decided to take this opportunity to write a class myself and maybe ...
1
vote
1answer
66 views

Power 8 AES implementation using built-ins

I need a review of an AltiVec/Power 8 AES implementation using built-ins to access in-core crypto. The program below is an implementation of FIPS 197, Appendix B. The hard-coded values are due to the ...
5
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1answer
6k views

Encrypt and decrypt a message using AES-256 with GCM mode using Bouncy Castle C# library

Goal: Given a plaintext message and 256 bit key, encrypt (and subsequently decrypt) the message using a 12 byte IV (in this case null bytes for simplicity, should not do this, I know) with MAC of ...
2
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0answers
388 views

Partial file encryption with AES

Task is to encrypt part of the file using aes encryption algorithm. I did ...

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