Qtum Core Wallet
C++ cryptographic library (modern hash functions, ciphers, KDFs)
Open-source code that enables you to use AES in CBC mode
Blockchain-based distributed PKI protocol
Cryptographic PRNG
Low Fees | No Banks | 5.5% Interest | Transfer Worldwide
inKey - small & strong encryption utility (> 800 000 bit).
Set of useful tools for payment service development