This question concerns block cipher padding. Suppose the block cipher has a block size of 16 bytes. A certain message ends with a block which is 16 bytes. We must reversibly pad out the message to use some block cipher modes, such as CBC (even if the last block is full, which it is in this case). Consider the following padding strategy. Append a single byte with value 128, and then as many zero bytes as required to make the overall length a multiple of 16. Suppose the final (possibly partial) block of the message is "Ox000102030405060708090a0b0c0d0e0f" in hexadecimal. Write out the complete final block in hexadecimal. Please do not put a leading Ox as this has been written already. Because the last block is actually full, the block you add will need to be a completely new block. Ox

Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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This question concerns block cipher padding. Suppose the block cipher has a
block size of 16 bytes. A certain message ends with a block which is 16 bytes. We must
reversibly pad out the message to use some block cipher modes, such as CBC (even if the
last block is full, which it is in this case).
Consider the following padding strategy.
Append a single byte with value 128, and then as many zero bytes as required to make the
overall length a multiple of 16.
Suppose the final (possibly partial) block of the message is
"Ox000102030405060708090a0b0c
hехad
mal. Write out the complete
hal
block in hexadecimal. Please do not put a leading Ox as this has been written already.
Because the last block is actually full, the block you add will need to be a completely new
block.
Ох
Transcribed Image Text:This question concerns block cipher padding. Suppose the block cipher has a block size of 16 bytes. A certain message ends with a block which is 16 bytes. We must reversibly pad out the message to use some block cipher modes, such as CBC (even if the last block is full, which it is in this case). Consider the following padding strategy. Append a single byte with value 128, and then as many zero bytes as required to make the overall length a multiple of 16. Suppose the final (possibly partial) block of the message is "Ox000102030405060708090a0b0c hехad mal. Write out the complete hal block in hexadecimal. Please do not put a leading Ox as this has been written already. Because the last block is actually full, the block you add will need to be a completely new block. Ох
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