Another interesting idea would be to encode and commemerate the discovery of cosmic bursts by the CIA's Vela satellites. This spectrum analysis intelligence had to be "decoded". It fits with the artists theme of decoding the mysteries of the universe. The Kryptos insricption might relate to the analysis or raw data reports from the Vela sattellites.

The CIA Discovers Gamma Rays from Outer Space! - In 1967, during the Johnson Administration, the United States entered a treaty that banned the testing of nuclear weapons in space. In order to verify that the terms of the treaty were being observed, in the late 1960s the CIA and other intelligence agencies arranged for the Air Force to launch the VELA series of surveillance satellites, which carried omni-directional detectors sensitive to pulses of gamma rays that would have been emitted in great numbers by any space-based tests of nuclear weapons. The VELA satellites never detected a nuclear explosion, or at least never detected one originating in our Solar System.

However, from the time when the first VELA probe was activated bursts of gamma rays were detected every few days. The intelligence analysts were baffled and suspected satellite malfunctions or some form of deliberate jamming that would hide real tests. Finally, with several satellites in orbit simultaneously it became possible to use the arrival time of the pulses at different locations to determine the direction of the source of the radiation. It was found that the bursts came from a number of directions outside the solar system. The existence of these bursts was kept as a closely guarded secret for several years. Finally, in 1973, a paper was published in Astrophysics Journal Letters describing the observation of gamma ray bursts, and the astrophysicists of the world were confronted with a new phenomenon, which, at the time of the 17th Texas Symposium of Relativistic Astrophysics has still not been adequately explained.