They don't seems encrypted to me.
I can read my character's name or save profile name by editing them on hex editor.
Savegames often contains a checksum to verify the data integrity, if you edit a value you might have to fix the checksum too or the game will report it as corrupted.
To start doing savegame hacking, just create multiple saves, with very few changes (HP, level, names, save place, etc.) and compare the files to see what's different.
some game have a very easy savegame data format (if it's only a list of completed level, like captain toad) to very complex one (like RPG, xenoblades, ass creed, etc.)