for IV-based modes: How is the IV generated? Is it generated randomly and put into the container format or is it derived together with the key from a password and therefore doesn't need to be put into the ciphertext container?
for nonce-based modes like CTR: How big is the nonce (sometimes referred to as IV)?
for parametrized modes like CFB: How big is a segment?
Is everything encoded together into a textual format from the finished binary format or are the components encoded separately and concatenated together?