Consider a raw CBC MAC construction from Lecture 6, part 1(marked in green on slide 24 – it uses only one key “k”).
a) Show that prepending the message with its length denoted“|m|” (i.e., adding an extra block before m[0] with |m| encoded inbinary) results in a secure MAC.
b) Show that appending |m| to the end of the message does notresult in a secure MAC.
![raw CBC with pre-pended message length m[O) m[2] F(k,) F(k,) tag](https://d2vlcm61l7u1fs.cloudfront.net/media%2Fda3%2Fda32aeeb-eae4-4014-926e-9a061c8fe910%2FphpDWRhKy.png)
raw CBC with pre-pended message length m[O) m[2] F(k,) F(k,) tag Show transcribed image text
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