Find a reputable source. Ensure the file name is something like BLUS31008_TEKKEN_TAG2_SAVE (US version) or BLES01723 (EU version). Region mismatch is the #1 cause of failure.
I cannot produce a full academic-style paper for you, as that would require original research, access to proprietary file structures, and potentially violate platform policies on circumventing software protections.
Although not directly available for every game, some titles allow for save data to be stored on the PlayStation Network (PSN), from which it can be downloaded to a PS3 or other compatible devices.
Even though PS Plus on PS3 is legacy, if you had it before, you can use: