Questions tagged [cryptography]

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Is there a script to find/extract steganographically hidden files in all images of a directory?

Is there a script to detect and extract files that were steganographically hidden in images? It would be best if it was a Python script and scanned for as many methods of steganography as possible. It ...
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1answer
32 views

Seeking a command-line SHA256 bulk hashing tool for Windows

I want to write Windows batch commands that can specify individual files or all files recursively in a folder. Either way, the output should be the full name (including path) of a file and its SHA256 ...
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14 views

Looking for quantum-resistant cryptography package for Flutter/Dart

I recall seeing some sort of potential quantum-resistant cryptographic algorithm in a Flutter package API however I have searched and searched again and cannot find anything. Anyone know of any ...
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6 views

XMPP/OMEMO server and client written in memory safe language

Is there an XMPP server and client with OMEMO support that is written in a memory safe language? it must be free software and run on linux.
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39 views

CA for Ed25519ph signing x.509 certificates

I am looking for a CA that supports Ed25519ph signing. I tried Microsoft/OpenSSL/EJBCA, but none of them are supporting Ed25519ph. any suggestion about CA/PKI that can support ED25519PH?
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1answer
34 views

Android ROMs whoose releases are cryptographically signed (gpg)

What is the list of popular Android ROMs whose releases are cryptographically signed? Today I learned that LineageOS (arguably the most-popular open-source Android ROM) does not cryptographically sign ...
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10 views

Keccak hashing utility

A utility software (for linux bash) to perform Keccak hashing. I have come across this package: https://github.com/maandree/sha3sum, however it contains no information on how to build, nor was I able ...
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13 views

Python library recommendations for cryptography

Which open source library that implements all steps of HE schemes namely: key generation, encryption, decryption and evaluation for the following algorithms: RSA, El Gamal and LWE (learning with ...
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6 views

Production-grade libraries for zero knowledge proof algos?

Are there any freeware libraries out there that are generally considered "production grade" for zk-STARK, zk-SNARK and similar? The ones I've found so far always stated explicitly that they ...
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19 views

Is possible to do a good FDE on Windows 10?

I would like to be able to encrypt my system disk in the classic way, using a password that is used to encrypt the disk. It is not possible to use bitlocker unless you accept to keep the key in the ...
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20 views

Which libraries to use to implement cryptographic functions?

I am using python3 to implement a Vehicular ad hoc network's solution using cryptography. In python3 I found many cryptographic libraries to implement algorithms such as RSA, AES, etc. But none about ...
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1answer
23 views

Can I transfer a file larger than 4096 MB anywhere in the world using uTorrent safely and securely?

I want to send a file larger than 4096 Megabytes or 4 Gigabytes to anywhere in the world. It's a huge file. I know I can seed the file using uTorrent. And the person receiving the file can have a link ...
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36 views

Is there a usable CLI interface to libsodium?

I am hoping to ditch PGP in favor of a simpler and more modern tool. I understand that libsodium implements symmetric key encryption, non-repudiable signing (I think), authenticated (repudiable) ...
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44 views

Is there a KSP-to-PKCS#11-Bridge?

We are using a lot of cryptographic operations via the Windows CNG (which in turn uses a KSP to obtain keys for the cryptographic algorithms it executes). Most HSM vendors provide a KSP implementation,...
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1answer
111 views

Implementations of chameleon hash functions

For a research project we want to build a proof of concept of a redactable blockchain that employs chameleon hashing (cf. https://eprint.iacr.org/2016/757.pdf). We are looking now for implementations ...
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1answer
46 views

Are there any reliable implementations of ElGamal public key crypto in Java?

I need to use ElGamal for a project of critical importance in terms of confidentiality. My frustration is that I have not been able to find a reliable, industry-tested implementation of ElGamal ...
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1answer
639 views

ECDH online tool recommendation

Does anyone know some good online calculator or tool that can do a ECDH key agreement cross-check? I want to using the same test vector to do cross-check test with my code. I find this on-line tool ...
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653 views

is there any good implementation to the RSA in arduino ? c language

I need a good implementation to the RSA algorithm that works on Arduino Mega with key size 1024. The code will run on Arduino IDE. The project idea simply is that an Android app sends an encrypted ...
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1answer
181 views

C++ implementation of IEEE 1609.2 standard

I am looking for a C++ implementation of IEEE 1609.2 standard. This standard defines secure message formats and processing for use by Wireless Access in Vehicular Environments (WAVE) devices, ...
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47 views

Looking for C library to program a simple encryption/decryption task by non-cryptographer

I have been trying to implement a high-volume symmetric (AES256) encryption/decryption pipeline for files on disk. Originally, I tried to do this by having scripts call command-line tools such as ...
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1answer
63 views

Open source libraries for asymmetric encryption for Android and iOS

I'm looking for open-source libraries for both Android and iOS (Swift) to help implement Asymmetric key encryption. I have the public Key and the library should help with AES-128 (data encryption) and ...
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1answer
496 views

On-premise alternative for AWS QLDB

What is the best alternative for on-premise solution with the same features as Quantum Ledger Database - AWS QLDB? transparent, immutable, and cryptographically verifiable transaction log owned by a ...
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1answer
49 views

Recommendation on libraries for Elliptic Curves

I would like to program my cryptographic scheme which uses some computations on elliptic curves. I coded it using sagemath package, which is a python library. It is simple but very slow. I need to ...
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115 views

DOS 6.22/Windows 98 encryption software

Is there any encryption software (full disc encryption or container mode) available for Windows 98? Same question for plain DOS 6.22. Maybe it's strange, but for some reasons I need software like that....
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52 views

Library for FFT interpolation from values at arbitrary points

I'm trying to implement a cryptographic scheme that leverages constant-sized polynomial commitments by Kate et al [1]. I'm looking for a library that can interpolate a polynomial fast via FFT in a ...
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0answers
49 views

Need Dynamic S Box Library in Java

I need a Java source code library that can dynamically generate the SBox (substitution box) for AES based on the AES256 key provided.
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2answers
139 views

What's the easiest secure way to encrypt a string with my own password on Linux?

I have a 12 word string that I want to encrypt securely and easily with my own long password in order to store the (preferably readable) result in writing in paper. I'm basically looking for a step ...
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1answer
238 views

RSA library for C supporting smaller key sizes

I was developing a crypto cracking challenge where the ultimate task is to factor a RSA key. To make the process feasible I want to use small key sizes (512 bits and lower). The challenge is a ...
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32 views

Elliptic Curve Family "KSS16" arithmetic implementation in C (on embedded devices)

could someone help me find a running implementation of those families? I did some search through google by the terms * KSS16 implementation in C * KSS16 benchmark on embedded( devices) * KSS16 ...
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2answers
78 views

Configurable Rijndael implementation for Linux?

I'm trying to recreate an (old) C# program in something that will run on Linux. So far I'm struggling to find an implementation that's configurable enough to make it happen. These are the ...
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24 views

Image Steganography tool which works on linux and mobile platforms

This is the first time I am trying steganography tools. I am looking for an image steganography tool which works on Linux and mobile platforms. The secret message can be embedded in the image on Linux,...
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3answers
221 views

Java implementation of Supersingular isogeny Diffie–Hellman key exchange (SIDH)

I am looking for a SIDH implementation for Java. Any license, it's for testing. Any recommendations?
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134 views

Tool for Cryptographic Message Syntax

I am looking for a software tool (preferably command line, open source and running on Linux) which is able to comprehensively handle the Cryptographic Message Syntax (CMS) standard (formerly known as ...
1
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1answer
71 views

Lightweight cross-platform cryptography-quality RNG

I am looking for a lightweight (< 500 SLOC) random generator that's suitable for cryptography. This needs to be C code that I can include in the SlipRock library (which I am developing). Currently ...
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385 views

Double Ratchet Algorithm (Axolotl) implementations

I'm looking for libraries that implement the Double Ratchet Algorithm (known also as Axolotl). So far I've found the following: https://github.com/wireapp/proteus https://whispersystems.org/docs/ ...
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55 views

OpenSSL alternative that features better automation properties

I plan on making my own Certificate Authority, and already got quite a bit of money for the project, and now I need a way to issue certificates. I was going to use OpenSSL, but it isn't great for ...
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27 views

Useful security key/crypto testing software

Would prefer open source. Open to commercial recommendations if you can explain why there is no other good option. Looking for software that can more or less black box test for strength and ...
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28 views

Software for hardware enforced data backup?

The Problem (may be skipped) I'm thinking about transitioning to an improved backup solution in the long-term compared to what I did until now (which is documented in my other question). So in short, ...
4
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0answers
68 views

Tool for smart card based PGP decryption?

My problem (in case there's a solution I couldn't envision) I want to build a secure backup solution. As I own a smartcard, I thought to use asymmetric encryption with the private key remaining on ...
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3answers
372 views

CSPRGs in Python

I want to implement a CSPRNG for a stream cipher. I've tried implementing the BBS, but I've heard that it needs very big seeds to be secure. Is there a function in some library for Python 3 that adds ...
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1answer
63 views

DSA provider for java

What I want A DSA encryption and decryption provider for java. requirements 1-provides encryption and decryption with DSA: I don't need key generation because the official(and openjdk) provides ...
3
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1answer
47 views

crypto notes service

I'm looking for a online service similar to passpack.com but for notes, not for passwords. I want all the notes (plain text) has been encrypted on the server and decrypted on the client. The only ...
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0answers
170 views

Java library for threshold signatures

I need a library that implements threshold cryptography. The idea is to use the technique in a replicated system implemented in Java. So far, I have only found ThresSig (which implements Shoup's ...
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1answer
293 views

bare metal crypto library

I am writing an application that will be run on bare metal, i.e. it will not run on a kernel and therefore cannot invoke system calls. There will also be no C runtime. Is there a crypto library I can ...
4
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1answer
788 views

Small crypto library in C

What is the best C crypto library for small devices? My device is very limited in memory (only about 50 KB left). Also I do not need all of the fancy cryptography algorithms. An encryption, MAC ...
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2answers
372 views

Software for determining known text cipher type and key

I have a piece of encrypted text and the clear text. Do any open source tools (with sourcecode) exist that can help determine the type of cipher and the key? (Operating system or language is ...
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3answers
1k views

Lightweight crypto library to verify a signature

Are there any open source crypto libraries that can be used in embedded systems or in other memory constrained places like a boot rom? I am looking for libraries that I can compile only the algorithms ...
4
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2answers
14k views

Is there a lightweight library that can perform RSA-2048 encryption for an embedded application?

I'm looking for a C/C++ implementation of RSA with a 2048 bit key (preferably read from a file). My target is an embedded platform, so it comes with some odd restrictions. The hardware restricts us ...