Pendrive Linux with encrypted & persistent storage?

I want to create a cryptowallet on a USB stick. My idea was to find a pendrive Linux to install on a USB stick that I can carry around, put it into any (old) computer, boot and use the wallet. My requirements: - works on 32bit / boots on an old netbook (e.g. MSI Wind 100) - comes with a persistent, encrypted storage space - runs [Jaxx](https://jaxx.io/) - can be created on OSX or Xubuntu - optional: fits on a 1GB stick So far, I had some success with [PuppyLinux BionicPup32](http://puppylinux.com/download.html) . It matches nearly all the mentioned requirements, only that there is no storage partition in the shipped ISO. So what I did: - installed the [ISO](http://puppylinux.com/download.html) with [Etcher](https://www.balena.io/etcher/) , i.e. wrote the 278 image onto my 1GB stick. - then resized the partition to 300 MB - created an empty partition on the now free 700 MB - booted with the new stick - Puppylinux offered me to create a persistent storage on the 700 MB partition, encrypted with LUKS. Yay. - did what was offered - however, on next reboot the storage was not recognized – Puppylinux behaved as it was again a first boot What I am asking for now: - advice how to make Puppylinux recognize the persistent storage, or - an alternative solution matching my requirements (ideally a pendrive linux ISO that already comes with an additional storage partition)