Account creation with custom N, R, P parameters about web3j

[bigstar119]

hi，i get the same problem with you!! can you tell me how to change the N,R,P to make decrypt time quick?

[fraspadafora]

The geth mobile lib uses N = 4096 and P = 6
That can be decrypted in 10 seconds more or less.
For this reason I think it is useful to have the possibility to set the N,P and R parameters when an account is created.

[bigstar119]

change N adn P value make account create faster is good..but does it have security risks? the hacker decrypt it quick also.

[conor10]

We could potentially lower these values for the Android client. I'll follow up with the Go team on their justification for lowering the value - unless one of you can already provide this insight?

[fraspadafora]

In the geth mobile library for Android (https://ethereum.github.io/go-ethereum/downloads/) in the AccountManager, they are using the Geth.LightScryptN object with value 4096 and Geth.LightScryptP with value 6 to create a new account.
Of course it is easier to decrypt, but I think it is the compromise to have something usable.
I suggest to store big amounts of money in mist wallets, and less quantity in mobile accounts.

[conor10]

This functionality has been checked in - expect to see in web3j-android release 1.2.0 in the next week or so.

See https://github.com/web3j/web3j/blob/master/src/main/java/org/web3j/crypto/Wallet.java for details.