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1. Barney has created a new version of DES called Quadruple DES, which uses 4 56-bit keys instead of the 3 used by Triple DES. The structure is similar to that of Triple DES, with an additional encryption with the fourth key: Plaintext Plaintext DES DES DES DES Ciphertext Key 1 Key 2 Key 3 Key 4 Since this uses four keys, Barney believes that this is more secure than Triple DES, which uses 3 keys. Explain why it is not more secure than Triple DES; specifically, why adding a fourth key does not create any additional security over having just three keys. de mercado conden en be gin to do the more secure them 1. Barney has created a new version of DES called Quadruple DES, which uses 4 56-bit keys instead of the 3 used by Triple DES. The structure is similar to that of Triple DES, with an additional encryption with the fourth key: Plaintext Plaintext DES DES DES DES Ciphertext Key 1 Key 2 Key 3 Key 4 Since this uses four keys, Barney believes that this is more secure than Triple DES, which uses 3 keys. Explain why it is not more secure than Triple DES; specifically, why adding a fourth key does not create any additional security over having just three keys. de mercado conden en be gin to do the more secure them