SerializedScriptValue can be written to disk, via IndexedDB or History APIs. We should not store crypto keys as plaintext - they are like passwords, and passwords are encrypted in Keychain or equivalent.
Created attachment 223775 [details] proposed patch
Comment on attachment 223775 [details] proposed patch Clearing flags on attachment: 223775 Committed r163863: <http://trac.webkit.org/changeset/163863>
All reviewed patches have been landed. Closing bug.