The fact that's encrypted doesn't matter. There are a number of potential issues with collecting it in the first place. You can see some of the security concern

The fact that's encrypted doesn't matter. There are a number of potential issues with collecting it in the first place. You can see some of the security concerns which were brought up on their forums here: https://community.signalusers.org/t/proper-secure-value-security-pins-are-too-easy-to-brute-force-sgx-is-not-reliable-enough/15096 https://community.signalusers.org/t/proper-secure-value-secu...