how to decrypt bboo file

Once the ID ends in ‘t1’, this means that your files are encrypted with an offline key. This gives a chance that you can decrypt .bboo files for free. To date, the following STOP Djvu variants can be decrypted: gero, .hese, .seto, .peta, .moka, .meds, .kvag, .domn, .karl, .nesa, .noos, .kuub, .reco, .bora, .nols, .werd, .coot, .derp, .meka, .mosk, .peet, .mbed, .kodg, .zobm, .msop, .hets, .mkos, .nbes, .reha, .topi, .repp, .alka. As you can see, there are no ‘bboo’ on this list yet. This means you have to wait. I recommend that you try to decrypt .bboo files from time to time, since only security researchers will find the offline key, then decryption of these files will be possible.