Blockchain has many methods to provide data security and Secret Sharing is one of those. What happens in secret sharing is that, when a sender wants to send some data to a receiver, instead of directly sending the data, he divides the data into parts and sends it all over the network with the receiver as the destination. Any intermediate will only get a part of the message and will not know what it is. When all the parts reach the receiver, the receiver combines it to get the original data.