PEGASUS is an encryption algorithm used for satellite telemetry, command link and mission data transfers.
According to budget item justification document for FY 2004–2005,[1] this cryptographic algorithm is used for Global Positioning Systems (GPS), Space-Based Infrared Systems (SBIRS), MILSATCOM, and other Special Project Systems.
Original source: https://en.wikipedia.org/wiki/PEGASUS.
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