Which of the following can assist in recovering data if the decryption key is lost?

A Certificate Signing Request (CSR) is a block of encoded text submitted to a Certificate Authority (CA) to apply for a digital certificate. It is not related to key recovery, as its primary function is to initiate the process of acquiring a certificate rather than managing or recovering lost encryption keys.

Salting is a technique used to enhance password security by adding a random value (salt) to the password before hashing. While it improves the security of stored passwords against attacks, it does not provide any mechanism for recovering lost decryption keys, making it irrelevant in this context.

A root of trust is a foundational security component that establishes a chain of trust in a system, typically found in hardware or software security architectures. Although it plays a crucial role in secure operations and authentication processes, it does not facilitate the recovery of lost encryption keys directly.