Isn’t it possible to identify the encryption key used for ransomware by finding a known file and seeing how it had changed?

Analyzing a known file and its encrypted version may not directly reveal the encryption key used by ransomware. Encryption keys are typically kept secure by ransomware creators to prevent decryption without payment. However, some ransomware may exhibit flaws that could potentially lead to key recovery through detailed analysis or with the help of security researchers. Overall, while analyzing such files can provide valuable insights into ransomware operations, it may not always lead to disclosure of the encryption key.