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How does setting the nonce work?
#1
Question 
I hear everyone saying you have to set your nonce before you can downgrade. What I want to know is, when I save a lot of SHSH2 BLOBS on TSSSaver, does each blob contain a different apnonce?
I have 4 folders for 12.4 blobs; Each folder says "apnonce-" and then a line of characters and number; The last folder says "noapnonce". I assume if I'm using the 12.4 blob from any of the folders that says "apnonce-" I should set my nonce to the characters listed in the folders name?
i.e. apnonce-d8f682df87d812c372491b613d59795a80383f439587c0bb511ccf6865eb87cc
What about the folder that says "noapnonce" what do I do then?
When I open the blobs in notepad and go to the bottom of the texts I see an area that says <key>noNonce</key> which I don't know what that means? In both apnonce and noapnonce, the blobs say that.
I also really don't understand whether if I should be setting my nonce anytime after Jailbreaking; Right after the first time Jailbreaking; Or only set the nonce when I'm about to start the process of downgrading and if this last one, do i just pick randomly between the 3 folders apnonce names? and after setting it to one of them. the other 2 are useless unless i set the nonce again but to one of the other 2? so basically  it must match with the blob I'm using?

Terribly sorry if this turned out terribly confusing...
 
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#2
Let's address this point by point.

- Nonces are unique pseudo-random keys generated by iBoot based on a generator string. As far as I know, the apnonce- ones are based on different generators (?) and the noapnonce is basically based on the 0x1111111111111111 generator which most people use. You're likely interested in that folder and that generator if you use Unc0ver. Chimera has its own generator string which produces a different kind of blobs.

- Setting it would keep it valid until a restore is initiated.
 
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#3
(09-07-2019, 07:18 PM)GeoSn0w Wrote: Let's address this point by point.

- Nonces are unique pseudo-random keys generated by iBoot based on a generator string. As far as I know, the apnonce- ones are based on different generators (?) and the noapnonce is basically based on the 0x1111111111111111 generator which most people use. You're likely interested in that folder and that generator if you use Unc0ver. Chimera has its own generator string which produces a different kind of blobs.

- Setting it would keep it valid until a restore is initiated.
So I should like, right now, I should set my nonce to 0x1111111111111111 either just to have it set already or because I need it done right away?
If the other blobs use another generator, how would I go about using those then?
Considering I use Unc0ver would u strongly suggest i just stick to 0x1111111111111111?
 
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