This question concerns block cipher padding. Suppose the block cipher has a block size of 16 bytes. A certain message ends with a partial block which is 13 bytes. We must reversibly pad out the...

Extracted text: This question concerns block cipher padding. Suppose the block cipher has a block size of 16 bytes. A certain message ends with a partial block which is 13 bytes. We must reversibly pad out the message to use some block cipher modes, such as CBC (even if the last block is full). Consider the following padding strategy. Determine the number of padding bytes required. This is a number n which satisfies 1 < 16="" and="" n="" +="" l(p)="" is="" a="" multiple="" of="" 16,="" where="" l(p)="" is="" the="" length="" of="" the="" unpadded="" plaintext.="" pad="" the="" plaintext="" by="" appending="" n="" bytes,="" each="" with="" value="" n.="" suppose="" the="" final="" (possibly="" partial)="" block="" of="" the="" message="" is="" "0x000102030405060708090a0b0c"="" in="" hexadecimal.="" write="" out="" the="" complete="" final="" block="" in="" hexadecimal.="" please="" do="" not="" put="" a="" leading="" ox="" as="" this="" has="" been="" written="" already.="" ox="">