How is this "Sony's solution" though?

Public key cryptography has existed for many decades, and has been used in many devices to prevent piracy; and the particular implementation I described has never been used by Sony because it requires an interactive media format, and Blu-Ray is strictly passive.

In fact, if Nintendo implemented the solution I described they would be the first videogame company to use that scheme; but they would be far from the first company to use that scheme. The first time I heard of this scheme would have been about 15 years ago, and it was being proposed as part of a smart card solution for credit cards; it was essentially their solution to prevent people from being able to make a physical copy of someone else's smart card, and from what I remember it was rejected because (at the time) the on-card chip could only handle 48bit encryption.

You may want to read what you are quoting :)

OP: *posts a DS flash card that works on 3DS that like DS flashcards can only play DS games*

People: LOLZ 3DS is already hacked look at those making fun of Sony at least it took a few years!

Me: Uhm a flash card able to play DS games on a DS is no different than a flash card playing DS games on a 3DS... It's not hacked since flash cards aren't exactly hacking it's tricking the system into thinking there is a DS card inserted, hacking would mean the coding of the system had been hacked which neighter the DS nor the 3DS has been so far, the only reason these cards still run on the DS is because there is no firmware updates.

I don't really get why this is such a hard concept

Interesting to see a solution to Sony's piracy problem resolved in a Nintendo thread.

should just ban everyone who does not do any reading and comes in and commetns about how pathetic it is for 3DS to be hacked so early and how ps3 took four years ect.  seriously guys read, the 3DS is not hacked.