Using DES and AES, design a new symmetric cipher called 2DES-AES, which uses DES two times and AES-128 once. The block size of the new cipher is 128 bits. What is the key size for this new cipher? Show the encryption and decryption steps of this algorithm. Note that the block size for DES is 64-bits while for AES, the block size is 128 bits. Hint: you may need to use two DES encryption/decryption functions in parallel.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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Using DES and AES, design a new symmetric cipher called 2DES-AES, which uses DES two times and AES-128 once. The block size of the new cipher is 128 bits. What is the key size for this new cipher? Show the encryption and decryption steps of this algorithm. Note that the block size for DES is 64-bits while for AES, the block size is 128 bits. Hint: you may need to use two DES encryption/decryption functions in parallel. 

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