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which concept in public key cryptography?

The Clipper Chip utilizes which concept in public key cryptography?

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A.
Substitution

B.
Key Escrow

C.
An undefined algorithm

D.
Super strong encryption

Explanation:
The Clipper chip was a chipset that was developed and promoted by the United States National Security
Agency (NSA) as an encryption device, with a built-in backdoor, intended to be adopted by telecommunications
companies for voice transmission. It was announced in 1993 and by 1996 was entirely defunct.
The Clipper chip used a data encryption algorithm called Skipjack to transmit information and the Diffie-Hellman
key exchange-algorithm to distribute the cryptokeys between the peers.
At the heart of the concept was key escrow. In the factory, any new telephone or other device with a Clipper
chip would be given a cryptographic key, that would then be provided to the government in escrow. If
government agencies “established their authority” to listen to a communication, then the key would be given tothose government agencies, who could then decrypt all data transmitted by that particular telephone. The newly
formed Electronic Frontier Foundation preferred the term “key surrender” to emphasize what they alleged was
really occurring.
Incorrect Answers:
A: Substitution is not the concept used by the Clipper Chip.
C: Clipper chip does not use an undefined algorithm although the Skipjack algorithm was initially classed as
‘Secret’ by the NSA.
D: The Clipper chip does not use ‘Super Strong’ encryption. The encryption key was 80-bit.

https://en.wikipedia.org/wiki/Clipper_chip


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