This question concerns block cipher padding. Suppose the block cipher has a block size of 18 bytes. A certain message ends with a partial block which is 2 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. Append a single byte with value 128, and then as many zero bytes as required to make the overall length a multiple of 18. Suppose the final (possibly partial) block of the message is "0x0001" in hexadecimal. Write out the complete final block in hexadecimal. 0x = (put answer here)
This question concerns block cipher padding. Suppose the block cipher has a block size of 18 bytes. A certain message ends with a partial block which is 2 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.
Append a single byte with value 128, and then as many zero bytes as required to make the overall length a multiple of 18.
Suppose the final (possibly partial) block of the message is "0x0001" in hexadecimal. Write out the complete final block in hexadecimal.
0x = (put answer here)
Cipher Padding:-
Padding is any of a variety of separate cryptographic techniques that all involve adding information to the beginning, middle, or end of a message before encryption.
Padding is a technique for making data that might or might not be a multiple of a cipher's block size. This is necessary for many block cyphers because certain cyphers demand that the data being encrypted be an exact multiple of the block size.
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