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PGP encrypts data by using a block cipher called ______

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PGP encrypts data by using a block cipher called ______

(a) international data encryption algorithm

(b) private data encryption algorithm

(c) internet data encryption algorithm

(d) local data encryption algorithm

The question was posed to me during an online interview.

My doubt is from Security In The Internet topic in portion Networking of Computer Network

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The correct choice is (a) international data encryption algorithm

To elaborate: The IDEA was designed in 1991 by Xuejia Lai and James Massey. Before IDEA, PGP used the cipher method BassOmatic.

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