canvas-lms
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Update default LTI keys
The default keys used a short key length and outdated algorithm, which made them incompatible with newer LTI tools.
I also updated the instructions for generating new keys; the old instructions don't work (see #1861). I copied the call from here:
https://github.com/instructure/canvas-lms/blob/fbe666acc0eebabb52c11f9c83c3d8d0134ff2d6/gems/canvas_security/lib/canvas_security/key_storage.rb#L34-L36
Closes #1861.