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______ key encryption uses two keys: a public key that everyone can have and a private key for only the recipient.

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BlackTom AI · Accepted Answer

To tackle this fill-in-the-blank, we first identify the topic: key encryption and the type that uses two keys.
Option 1: Public. This is the correct idea, because public key encryption (asymmetric crypto) relies on a publicly shared key for encryption and a separate private key for decryption, enabling secure communication without sharing secret keys.
Option 2: Physical. This choice is off-target for cryptography concepts; ‘physical key’ would refer to tangible objects rather than a cryptographic key pair, and it does not describe the two-key scheme used in encryption.
Option 3: Private. While the private key is essential in public key cryptography for decryption, the phrase in question specifically denotes that there is a publicly available key in addition to the private key. Relying on a private key alone would describe symmetric or single-key methods, not the two-key public/private pair described here.
In summary, the statement aligns with the model of public key cryptography, where a public key and a private key form a complementary pair, unlike the misleading notions of ‘physical’ or ‘private’ alone.

Blank ______ key encryption uses two keys: a public key that everyone can have and a private key for only the recipient.

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