NetCrypt
NetCrypt - file-transfer utility providing secure data transfer
...No public key distribution is required: NetCrypt is designed to use a symmetric passphrase with a strong key-derivation-function.
NetCrypt seeks to fulfill all those requirements.
In it's default configuration, it uses the AES-256-GCM cipher with a PBKDF2 key iteration count of 32000 rounds.
NetCrypt is an secure alternative to netcat, but might also supplement SFTP or SSH for file-transfer.