cryptography is a package which provides cryptographic recipes and primitives to Python developers. Our goal is for it to be your "cryptographic standard library". It supports Python 2.7, Python 3.4+, and PyPy 5.3+. cryptography includes both high level recipes and low level interfaces to common cryptographic algorithms such as symmetric ciphers, message digests, and key derivation functions. For example, to encrypt something with cryptography's high level symmetric encryption recipe.

Cryptography - Package designed to expose cryptographic primitives and recipes to Python developers

The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

OpenSSL - Toolkit for SSL and TLS

Rustls is a modern TLS library written in Rust. It uses ring for cryptography and libwebpki for certificate verification. Rustls aims to provide a good level of cryptographic security, requires no configuration to achieve that security, and provides no unsafe features or obsolete cryptography.

rustls - A modern TLS library in Rust

KeyczarKeyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Keyczar was originally developed by members of the Google Security Team. 
 
Keyczar is designed to be open, extensible, and cross-platform compatible. It is not intended to replace existing cryptographic libraries like OpenSSL, PyCrypto, or the Java JCE, and in fact is built on these libraries.

KeyczarKeyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Keyczar was originally developed by members of the Google Security Team. 

Keyczar - Toolkit for safe and simple cryptography

s2n is a C99 implementation of the TLS/SSL protocols that is designed to be simple, small, fast, and with security as a priority. s2n implements SSLv3, TLS1.0, TLS1.1, and TLS1.2. For encryption, s2n supports 128-bit and 256-bit AES, in the CBC and GCM modes, 3DES, and RC4. For forward secrecy, s2n supports both DHE and ECDHE. 

s2n - an implementation of the TLS/SSL protocols from Amazon

Easy Tink provides APIs that are simple and easy to use correctly. Most cryptographic operations such as data encryption, digital signatures, etc. can be done with only a few lines of code.Security Tink reduces common cryptographic pitfalls with user-centered design, careful implementation and code reviews, and extensive testing.
 
 At Google, Tink is already being used to secure data of many products such as AdMob, Google Pay, Google Assistant, Firebase, the Android Search App, etc.

Tink is a multi-language, cross-platform library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.. Most cryptographic operations such as data encryption, digital signatures, etc. can be done with only a few lines of code. Tink reduces common cryptographic pitfalls with user-centered design, careful implementation and code reviews, and extensive testing.

Tink - Cryptographic library that provides an easy, secure, and agile API for common cryptographic tasks

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management. With Shiro’s easy-to-understand API, you can quickly and easily secure any JVM-based application – from the smallest mobile applications to the largest web and enterprise applications.

Apache Shiro - Java Security Framework

Tendermint Core is Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine - written in any programming language - and securely replicates it on many machines.
 
Tendermint is software for securely and consistently replicating an application on many machines. By securely, we mean that Tendermint works even if up to 1/3 of machines fail in arbitrary ways. By consistently, we mean that every non-faulty machine sees the same transaction log and computes the same state. Secure and consistent replication is a fundamental problem in distributed systems; it plays a critical role in the fault tolerance of a broad range of applications, from currencies, to elections, to infrastructure orchestration, and beyond.
 
Tendermint consists of two chief technical components: a blockchain consensus engine and a generic application interface. The consensus engine, called Tendermint Core, ensures that the same transactions are recorded on every machine in the same order. The application interface, called the Application BlockChain Interface (ABCI), enables the transactions to be processed in any programming language. Unlike other blockchain and consensus solutions, which come pre-packaged with built in state machines (like a fancy key-value store, or a quirky scripting language), developers can use Tendermint for BFT state machine replication of applications written in whatever programming language and development environment is right for them.

Tendermint Core is Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine - written in any programming language - and securely replicates it on many machines.

Tendermint - Tendermint Core (BFT Consensus) in Go

Conscrypt is a Java Security Provider (JSP) that implements parts of the Java Cryptography Extension (JCE) and Java Secure Socket Extension (JSSE). It uses BoringSSL to provide cryptographical primitives and Transport Layer Security (TLS) for Java applications on Android and OpenJDK.The core SSL engine has borrowed liberally from the Netty project and their work on netty-tcnative, giving Conscrypt similar performance.

Conscrypt - Java Security Provider that implements parts of the Java Cryptography Extension and Java Secure Socket Extension

Themis is open-source high-level cryptographic services library for mobile and server platforms, providing secure messaging and secure data storage. Themis provides three important cryptographic services Secure messaging, Secure session and Secure storage. 
 
<ul>
<li>
Secure Message: a simple encrypted messaging solution for the widest scope of applications. Exchange the keys between the parties and you're good to go. Two pairs of the underlying crytosystems: ECC + ECDSA / RSA + PSS + PKCS#7. </li>
<li>
Secure Session: session-oriented, forward secrecy datagram exchange solution with better security guarantees, but more demanding infrastructure. Secure Session can perfectly function as socket encryption, session security, or (with some additional infrastructure) as a high-level messaging primitive. ECDH key agreement, ECC & AES encryption.</li>
<li>
Secure Cell: a multi-mode cryptographic container suitable for storing anything from encrypted files to database records and format-preserved strings. Secure Cell is built around AES in GCM (Token and Seal modes) and CTR (Context imprint mode).</li>
<li>
Secure Comparator: a Zero-Knowledge based cryptographic protocol for authentication and comparing secrets.</li>
</ul>

Themis is open-source high-level cryptographic services library for mobile and server platforms, providing secure messaging and secure data storage. Themis provides three important cryptographic services Secure messaging, Secure session and Secure storage. 

Themis - Crypto library for storage and messaging for ObjC, Android, C++, JS, Python, Ruby and PHP

 Rustls is a modern TLS library written in Rust. It's pronounced 'rustles'. It uses ring for cryptography and libwebpki for certificate verification. It aims to provide a good level of cryptographic security, requires no configuration to achieve that security, and provides no unsafe features or obsolete cryptography.

Password4j is a Java user-friendly cryptographic library for hashing and checking passwords with different Key derivation functions (KDFs) and Cryptographic hash functions (CHFs). The library fully supports Argon2, BCrypt, SCrypt and PBKDF2 and can produce and handle cryptographic salt and pepper.

Password4j - Cryptographic library that supports Argon2, Bcrypt, Scrypt, PBKDF2 and various cryptographic hash functions. 

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Cryptography - Package designed to expose cryptographic primitives and recipes to Python developers

OpenSSL - Toolkit for SSL and TLS

rustls - A modern TLS library in Rust

Keyczar - Toolkit for safe and simple cryptography

s2n - an implementation of the TLS/SSL protocols from Amazon

Tink - Cryptographic library that provides an easy, secure, and agile API for common cryptographic tasks

Apache Shiro - Java Security Framework

Tendermint - Tendermint Core (BFT Consensus) in Go

Conscrypt - Java Security Provider that implements parts of the Java Cryptography Extension and Java Secure Socket Extension

Themis - Crypto library for storage and messaging for ObjC, Android, C++, JS, Python, Ruby and PHP

rustls - A modern TLS library in Rust

Password4j - Cryptographic library that supports Argon2, Bcrypt, Scrypt, PBKDF2 and various cryptographic hash functions.

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