1. A device comprising: enqueue circuitry; said enqueue circuitry being coupled to a memory; said enqueue circuitry being configured to, without said enqueue circuitry executing software from said memory: receive an enqueue command that comprises a key with an encrypted code, wherein the key identifies a queue in said memory; authenticate the encrypted code; enqueue a queue entry to the queue identified by the received enqueue command in response to receiving said enqueue command if the encrypted code was successfully authenticated.