Does the size of the cryptogram affect the possibility of breaking it? Does the size of the cryptogram affect the possibility of breaking it?
In the context of symmetric and block algorithms.
Does the format and earlier processing of the document (compression, changing the document format) affect the possibility of its cryptanalysis?
Maybe you can share some more information about what the attack model is?
For all practical purposes it does not matter how much data an adversary obtains - a secure cryptosystem (when used correctly) guarantees the secrecy of the data it encrypts.