Probably, if you downloaded it from a trusted source or you verified it yourself. I'm not aware of any vulnerability affecting it as of now.
Ok, thanks!
You can actually just use the same address for both Bitcoin and Bitcoin Cash, they are generated the same way and they do have replay protection. If you want to move it, I would suggest for you to decrypt it using bitaddress and import it into Electrum. You might want to do it in an airgapped condition if you want the maximum security
Ah, can I use my android phone for this? Electrum seems to have a android app, do you recommend Electrum instead of Mycelium?
What do you mean? The Mycelium cold storage function should be fairly safe, and you can use it without problem though it is not the most secure as compared to an airgapped Electrum.
Well I thought it would be easier just to use a old phone to move the funds between paper wallets, but it's maybe secure enough? The process for signing offline transactions seems quite difficult, I'm afraid of doing something wrong, want a quite straight forward process.
I will still generate the new private addresses on a air-gapped machine, but the move is going to be pretty "hot" with a android phone and Mycelium or Electrum.
