Service A and Service B belong to Organization A and Service C belongs to Organization B. Service A sends confidential messages to Service B, which forwards these messages to Service C. The message sent to Service C is intercepted by a load balancing service agent that determines which instance of Service C to route the message to. This entire message path needs to be encrypted in order to ensure message confidentiality from when the message is first sent by Service A until it is received by an instance of Service C. Organization A doesn't trust any intermediaries that may exist in between Service B and Service C and also doesn't want to share any keys with Organization B. Furthermore, there is a requirement to minimize any adverse effects on performance. Which of the following approaches fulfills these requirements?