Signal under fire for storing encryption keys in plaintext
stackdiary.com
As mentioned in the comments, plain text keys aren't bad because they are necessary. You have to have at least one plain text key in order to be able to use encryption
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I kind of agree that this may be a little overblown. Exploiting this requires device and filesystem access so if you can get the keys you can already get a lot more stuff.
A secure enclave can already be accessed by the time someone can access the Signal encryption keys , so there's no extra security in putting the encryption keys in the secure enclave.