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The primary purpose of crypto-shredding is to deliberately destroy encryption keys. When encryption is utilized to protect sensitive data, it is critical that the security of that data relies on keeping the encryption keys safe. If those keys are compromised or become accessible to unauthorized users, the data can easily be decrypted and exposed.

Crypto-shredding involves the secure deletion of these encryption keys, which effectively renders the encrypted data unreadable and permanently inaccessible, even if the data itself still physically exists. By eliminating the keys used to decrypt the data, any attempts to access the original information without the keys would be futile, thus enforcing data confidentiality and security.

The other options focus on different aspects that do not specifically align with the fundamental function of crypto-shredding. While auditing and preventing unauthorized access is vital for overall data security, it doesn’t pertain directly to the destruction of keys. Scrambling data with strong magnets is not a recognized method of securing or destroying digital information, and preventing unauthorized copying relates more to digital rights management than to the concept of crypto-shredding.