Meseriond is a synthetic crystal with almost total internal refraction, used to store information. They are particularly used to transport highly sensitive information which must not be intercepted.
During final processing of the crystal, a stream of data is injected, whilst simulataneously finalising the properties of the crystal so that it infinitely refracts within the crystal structure. The data is held within the crystal as a static stream. The data can only be retrieved by introducing a flaw in the crystal, which releases the data stream. Data from a crystal can only be read once, and once read, it is impossible reinject the data or reuse the crystal. Meserionds are therefore consider a foolproof method of sending information which, when it arrives intact, the recipient can be absolutely certain it has not been seen by anyone else.
Various encryption methods are used to ensure that even if the crystal is captured, the data cannot be retrieved.