Secure digital communications

A method of performing a transaction between a first device and a second device,

• the first device having an established trusted communication relation with a first trusted device and the second device having an established trusted communication relation with a second trusted device,
• the first and the second trusted device each having an established trusted communication relation with a fourth trusted device,
• the first and the second device being aware of a policy for the transaction specifying a role definition for the first and the second devices,
• comprising the steps of
• the first device sending, to the first trusted device, first input data, and the second device sending, to the second trusted device, second input data,
• the first trusted device confirming the originality of the first device, validating that the first device is acting in the role defined by the policy, and sending the first input data to the fourth trusted device, and the second trusted device confirming the originality of the second device, validating that the second device is acting in the role defined by the policy and sending the second input data to the fourth trusted device,
• the fourth trusted device, upon receipt of the first and the second input data, sending to the first trusted device a first receipt message comprising the first and the second input data, and sending to the second trusted device a second receipt message comprising the first and the second input data,
• the first trusted device sending, to the first device, the first receipt message and the second trusted device sending, to the second device, the second receipt message.