Hacking Can someone explain SigHax for a (half)noob?

[jengablock15]

EDIT: Solved, only needed some more lurking...

Hey, so yeah I got my 3ds pimped up and this was around the whole soundhax and fasthax business. I've lurked around a few threads on sighax but I still can't wrap it around my head.

Can someone please explain it in a noob-friendly manner for all of us. Make a new thread and link it if you can but if at least the casual community can get some information it would be very great.

Thanks in advance

 

[Deleted User]

All you really need to know is its going to be the a9lh replacement once its released.

 

[jengablock15]

Yeah about this, I did about like 10 more minutes of lurking i'm good now. Thanks for replying tho. I hope u have a nice year.

 

[CrimsonMaple]

SigHax is essentually a way to get the signature nintendo uses to sign their firmwares for the 3ds. With this we can sign our own firmwares, and make a true custom firmware.

 

[Ryccardo]

The (still not publicly dumped) arm9 bootrom contains code to verify the signature on the NCSD nand header (partition table) and kernel partitions.

A "bug" in said code makes a fake signature easy to bruteforce; not as easy as Trucha bug of the Wii (where it could really be a 1-byte challenge) but still much simpler than the full whatever-bits of the signature

Like arm11 exploits, sighax is useless by itself, but it can be implemented in other applications, like a future "free a9lh" replacement, not based on a N3DS-kernel's secondary exploit, but 100% homebrew code just reading arm9loaderhax.bin from nand/SD

This in turn means that, on every 3DS vulnerable to sighax (and they're likely not going to create a new CPU with an updated bootrom now),
1- they will forever be able to install this "free a9lh" with a hardmod (or arm9 exploit), regardless of version and without any downgrading
2- repair consoles with a corrupted nand and no backup

-----

While completely unrelated from sighax, the bootrom being dumped (a de facto prerequisite for sighax) will also mean the ability to decrypt titles directly on a PC (so, more convenient romhacking and emulation)

Plus, while not exactly exciting points for most people:
3- modding will be possible with 100% legal downloads (no more need for 2.1 mirrors, data input v3, ...)
4- Richard Stallman might consider buying a 3DS

 

[adrifcastr]

There you go. As Detailed as Possible.
https://gbatemp.net/threads/sighax-updates-and-discussion-thread.454821/