BigSpeed Secure Socket Library is an ActiveX control that aids the development of proprietary communication solutions over the Internet. It implements a message-oriented protocol on top of a single TCP connection with on-the-fly data scrambling. The transparent 128-bit AES encryption uses shared crypto keys, without need of SSL certificates.

BigSpeed Secure Socket Library can be used both on client and server side, with centralized management of all connections. Information is exchanged through typed data packets identified by a command code. The library takes care of all low-level tasks: packetizing/depacketizing, compression/decompression, encryption/decryption, sending, receiving, buffer congestion and flow control. There is support for automatic DNS name resolution and SOCKS proxy servers.