key splitting opens the backdoor on public-key cryptographic systems such that encrypted data can be deciphered without the private key. People in law enforcement claim that it can help to investigate cybercrime, while people concerned about privacy issues argue that this violates privacy, especially the European General Data Protection Regulation (GDPR). Furthermore, people against the practice worry about what would happen if the divided keys fall into an adversarys hands. Information systems are vulnerable to attackers if they can obtain access to backdoors. Explain