What is key escrow in cryptographic systems?
A technique to encrypt the same data with multiple keys
A method to derive multiple keys from a single master key
A procedure to securely transfer keys between systems
A practice where a trusted third party holds copies of encryption keys
The correct answer is A practice where a trusted third party holds copies of encryption keys. Key escrow is a practice where a trusted third party (the escrow agent) holds copies of encryption keys. The purpose is to ensure that authorized parties, such as law enforcement with proper legal authorization or organizations needing business continuity, can access encrypted data if the primary keys are unavailable.
A technique to encrypt the same data with multiple keys is incorrect because this describes multi-key encryption, not key escrow.
A method to derive multiple keys from a master key is incorrect because this describes key derivation functions, not key escrow.
A procedure to securely transfer keys between systems is incorrect because this relates to key distribution, not escrow.
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