The kind of attack you are referring to is known as a known-plaintext attack. In this type of attack, the attacker has access to both the plaintext and the corresponding ciphertext, and the goal is to deduce the encryption key or algorithm used. By analyzing the patterns or relationships between the known plaintext and ciphertext, the attacker can potentially uncover vulnerabilities in the cryptosystem.

There are diverse ways to encrypt information (convert it to cyphertext); how a text will look in cyphertext will depend on the method chosen, as well as the specific keys.

with a convertor :P