Question

how i solve this question?

Select the right answer: Based on MD5 hash algorithm if the message length is 512 KB, then the hash value (output) could be haw many bytes:   

• 128 bytes
• 481 bits
• 512 bits
• 16 bytes
• None of the above

Answer 1

Answer: 16 bytes

Explanation:

• The MD5 hash algorithm uses 512 bit size blocks to process to produce the hash output of 128 bit length.
• Irrespective of the entire message length, the output hash will be of constant size and it will be 128 bit.
• The input size of the message, whether it is 512 KB or 512 MB, the output hash value will not change and it will be 128 bits in standard MD5 case.
• The size of the entire hash value in bytes will be = 128/8 = 16 bytes.