Cryptographic keys and, subsequently, the data they are intended to protect, are safeguarded from unwarranted attacks utilizing various systems and methodologies designed to minimize the time period in which meaningful versions of cryptographic keys exist in accessible memory, and therefore, are vulnerable. The panel has an aerodynamic surface with a slot at one edge thereof which receives a portion of the support structure when the panel is in the first position. A structured data set based on a first data portion and a second data portion of the first messaging data set are received and value different from the value of the first data portion is stored within a first element of the structured data set. In a continuous burst mode, pulses are timed to irradiate droplets until accumulated burst error meets or exceeds a threshold burst error. The annular flexible member has a deflectable inner edge that defines a passage channel and the annular flexible member and internal post define a control gap therebetween wherein the deflectable inner edge of the annular flexible member deflects axially under increasing fluid pressure to reduce the control gap and consequently control fluid flow.