Continuous miniaturization and cost reduction of unit computing has led to the prolific growth of smart wearable devices. These devices, present on and around the human body, form a complex network known as the Human-Intranet. The Human-Intranet is typically connected through Wireless Body Area Network (WBAN). However, Human Body Communication (HBC) has recently emerged as an energy-efficient and secure alternative that uses the human body as the communication medium. Human-human, human-machine interaction creates dynamic HBC channels, which allow these Human-Intranets to interact with each other forming a Human-Internet. In this paper, we present the concept and demonstration of Secure Human-Internet using dynamic HBC. We highlight important applications of Human-Internet and discuss the architecture of a wearable Human-Internet device capable of communicating through inter-body dynamic HBC. A custom-built hardware prototype is used to demonstrate for the first time information exchange (e.g. business card) during handshaking. Dynamic signal transfer characteristics during inter-body communication through handshake between two individuals wearing such devices are measured and analyzed. The effects of data transmission rate, handshake posture on the HBC based inter-body communication is explored to demonstrate its effectiveness and limitations under varying realistic scenarios. The specific COTS based HBC implementation shows > 8× better energy efficiency compared to the Bluetooth implementation.