The paper is concerned with decoding the Extended Prediction Orbit data format file for an Assisted-GPS web-service via cypher-text only attack. We consider mandatory data content of the file and reveal the changes of this content at different moments. The frequency of changes hints at the location of records for current GPS date and satellite orbits information. Comparing the repeating data patterns against reference orbits information, we obtain the meaning of data fields of the orbit record for each operational satellite. The partially deciphered GPS almanac data layout is provided as a table within the paper. ; Peer reviewed


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    Partial Decoding of the GPS Extended Prediction Orbit File

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