CRC++ is a C++ library for calculating cyclic redundancy checks. It supports bit-by-bit and byte-by-byte calculation of full and multipart CRCs. It aims to have highly optimized algorithms that can run branchless for projects with a need for efficiency. Many common CRCs are provided out-of-the-box, such as CRC-32 (used in PKZip and Ethernet), CRC-XMODEM, and CRC-CCITT.

ccrypt is a utility for encrypting and decrypting files and streams. It was designed as a replacement for the standard unix crypt utility, which is notorious for using a very weak encryption algorithm. ccrypt is based on the Rijndael block cipher, a version of which is also used in the Advanced Encryption Standard (AES, see http://www.nist.gov/aes). This cipher is believed to provide very strong security.

Intel QuickAssist Technology provides hardware acceleration for offloading security, authentication and compression services from the CPU, thus significantly increasing the performance and efficiency of standard platform solutions. Its services include symmetric encryption and authentication, asymmetric encryption, digital signatures, RSA, DH and ECC, and lossless data compression. This package provides user space libraries that allow access to Intel QuickAssist devices and expose the Intel QuickAssist APIs and sample codes.

CryFS encrypts your files, so you can safely store them anywhere. It works well together with cloud services like Dropbox, iCloud, OneDrive and others. CryFS creates an encrypted userspace filesystem that can be mounted via FUSE without root permissions. It is similar to EncFS, but provides additional security and privacy measures such as hiding file sizes and directory structure. However CryFS is not considered stable yet by the developers.

BLAKE2 is a cryptographic hash function faster than MD5, SHA-1, SHA-2, and SHA-3, yet is at least as secure as SHA-3.

This module is intended to provide a cryptographically-secure replacement for Perl's built-in rand function. "Cryptographically secure", in this case, means:

1. No matter how many numbers you see generated by the random number generator, you cannot guess the future numbers, and you cannot guess the seed.

2. There are so many possible seeds that it would take decades, centuries, or millennia for an attacker to try them all.

3. The seed comes from a source that generates relatively strong random data on your platform, so the seed itself will be as random as possible.

This package provides an EmbeddedJSONSignature C++ class for signing and verifying the integrity of JSON objects using libsodium’s public-key signature system. Signatures are embedded into the JSON object itself as a key/value pair, while verification methods allow easy extraction of the unmodified object.

Asignify offers public cryptographic signatures and encryption with a library or a command-line tool. The tool is heavily inspired by signify as used in OpenBSD. The main goal of this project is to define a high level API for signing files, validating signatures and encrypting using public-key cryptography. Asignify is designed to be portable and self-contained with zero external dependencies. Asignify can verify OpenBSD signatures, but it cannot sign messages in OpenBSD format yet.

osslsigncode is a small tool that implements part of the functionality of the Microsoft tool signtool.exe - more exactly the Authenticode signing and timestamping. It is based on OpenSSL.

This package provides b3sum, a command line checksum tool based on the BLAKE3 cryptographic hash function.

This package provides a crate to sign files and verify signatures.

ssss-split and ssss-combine are utilities that split and combine secrets securely using Shamir's secret sharing scheme. This implementation allows for a threshold scheme where the minimum number of shares can be less than the total number of shares generated.

The signify utility creates and verifies cryptographic signatures using the elliptic curve Ed25519. This is a Linux port of the OpenBSD tool of the same name.

Enchive is a tool to encrypt files to yourself for long-term archival. It's a focused, simple alternative to more complex solutions such as GnuPG or encrypted filesystems. Enchive has no external dependencies and is trivial to build for local use. Portability is emphasized over performance.

Transcrypt is a script to configure transparent encryption of sensitive files stored in a Git repository. Files that you choose will be automatically encrypted when you commit them, and automatically decrypted when you check them out. The process will degrade gracefully, so even people without your encryption password can safely commit changes to the repository's non-encrypted files.

Tomb is an application to manage the creation and access of encrypted storage files: it can be operated from commandline and it can integrate with a user's graphical desktop.

Sodium is a new easy-to-use high-speed software library for network communication, encryption, decryption, signatures, etc.

DigiDoc is an XML file format for documents with digital signatures used by the Estonian ID card infrastructure. This library allows for creation and reading of DigiDoc files.

Hpenc is a command-line tool for performing authenticated encryption (AES-GCM and ChaCha20-Poly1305) of streaming data. It does not perform an asymmetric key exchange, instead requiring the user to distribute pre-shared keys out of band. It is designed to handle large amounts of data quickly by using all your CPU cores and hardware acceleration.

ISAAC (Indirection, Shift, Accumulate, Add, and Count) is a fast pseudo-random number generator. It is suitable for applications where a significant amount of random data needs to be produced quickly, such as solving using the Monte Carlo method or for games. The results are uniformly distributed, unbiased, and unpredictable unless you know the seed.

This package implements the same interface as Math::Random::ISAAC.

Botan is a cryptography library, written in C++11, offering the tools necessary to implement a range of practical systems, such as TLS/DTLS, PKIX certificate handling, PKCS#11 and TPM hardware support, password hashing, and post-quantum crypto schemes. In addition to the C++, botan has a C89 API specifically designed to be easy to call from other languages. A Python binding using ctypes is included, and several other language bindings are available.

ISAAC (Indirection, Shift, Accumulate, Add, and Count) is a fast pseudo-random number generator. It is suitable for applications where a significant amount of random data needs to be produced quickly, such as solving using the Monte Carlo method or for games. The results are uniformly distributed, unbiased, and unpredictable unless you know the seed.

This package provides a Perl interface to the ISAAC pseudo random number generator.

Monocypher is an easy to use, easy to deploy, auditable crypto library for C. Features include:

• Authenticated encryption with XChaCha20 and Poly1305 (RFC 8439)

• Hashing and key derivation with BLAKE2b (and SHA-512)

• Password Hashing with Argon2

• Public Key Cryptography with X25519 key exchanges

• Public Key Signatures with EdDSA and Ed25519

stoken is a token code generator compatible with RSA SecurID 128-bit (AES) tokens. This package contains a standalone command-line program that allows for importing token seeds, generating token codes, and various utility/testing functions.