Then how are you addressing 1) the security of the individual endpoints with access to each share. Let's say your magic wand is airgapped and nothing gets in v

Then how are you addressing 1) the security of the individual endpoints with access to each share. Let's say your magic wand is airgapped and nothing gets in via the share transmission media (QR-code, thumbdrive, whatnot). What if your Huawei, iPhone and device N are compromised via network because they're all connected to network at all times. The adversary can then just steal all necessary shares and they don't even need to access your magic wand, they can just XOR the shares from the three receiving endpoints and recover the message. 2) Airgap exfiltration security. Let's say the iPhone is secure enough and the adversary can't hack it. But how are you ensuring the QR-code scanner app of the Magic Wand can not be exploited with a carefully crafted QR-code? If the Magic Wand is compromised, it can leak plaintext messages the next time you scan the QR-codes of outgoing shares.