According to one example, a system includes a first computing device that includes one or more processors configured to generate a first encryption key, and encrypt data, using the first encryption key, for transmittal to a second computing device. The one or more processors are further configured to determine a first set of tokens; determine, from the first set of tokens, a plurality of tokens for the first encryption key; generate a packet comprising the encrypted data, and further comprising the plurality of tokens; and transmit the packet for receipt by the second computing device.