I'm unsure of why it is but I don't see why the algorithm can't just handle it like this: check string length if longer than 55, remove first 55 or less chara

I'm unsure of why it is but I don't see why the algorithm can't just handle it like this: check string length if longer than 55, remove first 55 or less characters up to end of string, store in array repeat until string is empty encrypt each item in the array, append them all on to each other as such EncryptedText[0] . EncryptedText[1]... etc Seems like a simple way to handle this. You could impose your own restrictions to stop a server DDoS by encryption requests on long strings, but to be honest if you're allowing a 100,000 character password, you're doing it all wrong.