Question 43

Key escrow can assist in recovering data if the decryption key is lost.

Key escrow is a method that involves storing a copy of the decryption key with a trusted third party, allowing for recovery of encrypted data in the event that the original key is lost.

A) CSR

A Certificate Signing Request (CSR) is a block of encoded text that is submitted to a Certificate Authority when applying for a digital certificate. It is not related to key recovery; rather, it is part of the process of obtaining a certificate for secure communications and does not assist in recovering lost decryption keys.

B) Salting

Salting is a technique used in hashing passwords to prevent attacks by adding a unique value to each password before it is hashed. While it enhances security against certain types of attacks, it does not provide a means to recover decryption keys, making it irrelevant to the question of key recovery.

C) Root of trust

A root of trust is a security architecture concept that establishes a chain of trust from hardware up to the operating system and applications. Although it is fundamental for secure systems, it does not directly relate to the recovery of encryption keys if they are lost.

D) Key escrow

Key escrow is specifically designed to address the problem of lost encryption keys by securely storing a copy of the key with a trusted third party. This ensures that if a user loses access to their key, they can retrieve it from the escrow agent, making it the correct answer in this context.

Conclusion

Key escrow is the only option among the choices provided that directly facilitates the recovery of lost decryption keys, thus enabling access to encrypted data. All other options either pertain to different aspects of cryptography or security that do not address key recovery, confirming that D is the definitive correct answer.