In a preferred embodiment, a system for securely delivering source data to a destination system over a network includes a data manager system operatively connected to the network, where the data manager system includes circuitry configured to receive a public key from the destination system, generate a random session key, encrypt the session key with the public key using a public key cryptosystem, divide the source data into a number of chunks, compress each of the chunks, merge all of the compressed chunks into an assembled file, encrypt the assembled file with the session key using a symmetric-key cryptosystem, divide the encrypted assembled file into a number of parts, send each of the parts to the destination system over the network, and send the encrypted session key to the destination system over the network.