kdkdodiei4

Well, I don't know, I just give a seed. Basically they are using a unicorn called a "space traveler", I don't know anything about it. But if you come from the future, you know everything xD.

Make it only decrypted by brute force, taking into account the history of the algorithms and the computational level. There is no clue, you just have to use the knowledge of the time to try to solve it. You can even create the program and its minimum requirements to make sure they have a direction.

For me it is easy if you are an old man you can simply know what algorithm was used at each time and at the computational level of each time, therefore you can make the only way to decipher the cave is by brute force and that it is probable and easy to resolved in each era through advances and knowledge.