I currently handle small
JSONs of sensitive information which are guaranteed to be smaller than 100 bytes. You can encrypt up to ~500 bytes with a 4096 RSA key.
Is it safe/secure to store these chunks of encrypted messages together? Let's say they get altogether stolen for cryptanalysis. Let's say you even have plaintext associated to some of them. Could you derive the private key or get knowledge about the rest of the encrypted messages?
Additional note: I need to encrypt without the requirement of the owner presence, but I need to guarantee the owner is present if that info is being read. That's the reason I'm using asymmetric encryption.