A system may include reception of a request for an encryption key pair including a first private encryption key and a first public encryption key, the encryption key pair associated with a future event, generation of the encryption key pair, transmission of the first public encryption key to a second device, reception, from the second device, of a file encrypted using the first public encryption key and using a second public encryption key of an intended recipient, transmission of the file to a third device associated with the intended recipient, detection of the future event, and, in response to the detection of the future event, transmission of the first private encryption key to the third device.