Abstract: A system may include at least one hardware processor implementing a verification unit configured to: receive a set of data from a first computer network; transmit an encrypted version of the set of data to a destination within a second computer network; receive a signature associated with the set of data from the first computer network; verify that the signature is indicative of the set of data being from a known source; and in response to verification of the signature, transmit a decryption key associated with the encrypted version of the set of data to the destination, wherein the destination is configured to decrypt the set of data with the decryption key.

Abstract: A first computer network 1, the computer network which is transmitting data, and a second computer network 2, the computer network which is receiving the data. The first computer network comprises a verification unit 7, which comprises a key generator 9, an encryption engine 10, a verification hasher 11, a signature verifier 12. The encryption engine 10 encrypts the data stream using an encryption key. As each part of the data stream is encrypted it is transmitted to the second computer network 2. The signature verifier 12 uses a decryption key to decrypt a signature for the set of data, and compares the decrypted signature to the hash value calculated by the verification hasher 11. The decrypted signature matching the hash value means the correct private key was used to create the signature and the set of data has not been modified since the signature was created, and so the signature is valid.