WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.
For full, incremental, compressed and encrypted backups or archives
Powerful webdav client and sync tools with client-side AES encryption
Robust and flexible VPN network tunnelling
57 Hash Functions In One Program, plus each with HMAC or KMAC
C++ cryptographic library (modern hash functions, ciphers, KDFs)
Send Mime and Smime Emails to Any Type of Mail Server
Checksum calculator and verifier tool
GILIB Large Integer Arithmetic Library
Comfortable hash-tool for texts and files
Programa de Criptografia.
Classic & Modern Cryptography tools
Secure Striker Manager
sha3sum - A demonstration of the Keccak permutation.
A family of FLEA-inspired CSPRNGs and Stream Ciphers
A tiny, fast encryption tool in C
RSA 4096 C++ library
xxteac - XXTEA Encrypter/Decrypter
A program to generate random reciprocal bigram tables