system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars: Force Awakens] Why don't people encrypt data they don't want stolen?

They could have encrypted the map, and copied it and sent it with every available method. Even if they were forced to physically carry it around, encrypting it would at least make it impossible for the New Order to find it. It's possible that they have quantum computers, but that only breaks asymmetric encryption. If they gave the guy a key before he left, they wouldn't need that. They could have given him a one-time pad, which is completely impossible to break. Did the entire galaxy never think of that? Or did they somehow find a way to magically tell whether a 0 was from 0 xor 0 or 1 xor 1?
gpt
Because it's more effective to hide it, as like so many technologies, encryption in the galaxy is asymmetric in scope. Known decryption technology is far more advanced than the encryption. Development in the galaxy has plateau'd, and much has been lost. Notice that many developments are just refinements on ancient technology. People maintain what works, even if the principles aren't fully understood. So they could encrypt it, waiting to be stolen and run through the Code Breaker (Model 900 or higher), or they could hide it well.

Societies in the galaxy advance in leaps and bounds for a while. Physics, art, mathematics - their first tentative steps into the galaxy are products of thousands of years of racial striving. 

Then they get out in to the universe at large and find out that everyone has already done it, bigger and better. So they stop trying. Other people will do it, so why bother? Programs are slowly defunded. Research labs close.

Science sometimes advances in leaps and bounds, but is just as often lost in the constant conflicts destroying societies around the galaxy. The technologies that remain are often standardised and wide spread - holocomms, for instance. Advancement would require a large amount of long term effort and resources -  a stable society - which just isn't available with constant wars. 

Some races, like the Twi'leks, never developed even that far before galactic contact and remain the poor retarded cousins of the galaxy. Others become dependent on the Force.  The few that do continue to advance quickly disappear.