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Cryptographic parameter enabling encryption/decryption.

Definition

An encryption key is a secret or private value used by cryptographic algorithms to transform plaintext to ciphertext and back, with security depending on key secrecy and strength.

In plain English Cryptographic parameter enabling encryption/decryption.

Why this matters

Why it matters: Key compromise collapses confidentiality; strong key management is required for privacy guarantees.

Example

Example: A symmetric key stored in an OS keystore and protected with hardware-backed security.