Questions tagged [cryptography]

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Any software mirroring an unencrypted drive resulting in an encrypted mounted drive?

This question was first asked on the cryptography community but was kicked off (not about how cryptography works). Have your ever heard of a cryptography software that would mount a drive (file/...
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Need a recommendation on a C++ library for file encryption

What would be a recommended library to use for file encryption in C++? I am looking for a standard up-to-date data encryption. The file-encryption will be based on a password. Searching the web I came ...
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Java library for extracting and validating digital signatures in any file format

I am writing a Java program which will need to validate CMS digital signatures on files in a variety of different formats: ZIP docx/xlsx PDF Any file with a detached signature I'd like a universal ...
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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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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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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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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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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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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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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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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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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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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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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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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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1 answer
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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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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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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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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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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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2 votes
1 answer
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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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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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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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4 votes
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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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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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2 votes
2 answers
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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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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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1 vote
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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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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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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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3 answers
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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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5 votes
0 answers
139 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 ...
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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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3 votes
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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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2 votes
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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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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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5 votes
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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, ...
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4 votes
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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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3 votes
3 answers
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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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1 vote
1 answer
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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 ...
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3 votes
1 answer
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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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2 votes
0 answers
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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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6 votes
1 answer
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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 ...
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4 votes
1 answer
842 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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1 vote
2 answers
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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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12 votes
3 answers
2k 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 ...
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4 votes
2 answers
15k 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 ...
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