The key issue here is that it really has to be much bigger, merely a hundred times or million times bigger is definitely not going to be sufficient. There inde

The key issue here is that it really has to be much bigger, merely a hundred times or million times bigger is definitely not going to be sufficient. There indeed is a limitation of key-based algorithms that encrypting too many blocks with a certain structure may make them vulnerable; however, that limitation is quite large unless you're using older/smaller algorithms like DES. I couldn't remember or quickly find what the circumstances are for e.g. AES-128 but IIRC it might be something like 2^48 blocks so for your approach to work, you'd have to stretch each block of content (e.g. 16 bytes) into petabytes of encoded data before you start having a theoretical chance to decode it; and for AES-256 it would probably be that amount squared, and you simply can't encode or store 2^96 blocks of anything.