When did the Public Key Crypto graphy Emerge
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1980s
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1970s
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1990s
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1975 or above
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Correct answer
Explanation
Public key cryptography emerged in the 1970s, with the groundbreaking Diffie-Hellman key exchange published in 1976 and the RSA algorithm developed in 1977. This revolutionized secure communication without requiring pre-shared secret keys.
AI explanation
Public key cryptography emerged in the 1970s, starting with the Diffie–Hellman key exchange published in 1976, followed shortly by RSA in 1977–78. Before this, cryptography was purely symmetric, requiring a shared secret key exchanged in advance. This 1970s breakthrough solved the key-distribution problem by allowing a public key to be shared openly while a private key stays secret.