Eve Sends E - A Middle Person Makes Two Secrets

The middle person sends her own public value to both sides.

highlighted = computed this step

Eve chooses her own secret

Eve chooses e=10 and publishes E=9.

E=5^{10}\bmod{}23=9

Alice receives E instead of B, and Bob receives E instead of A.

\text{both sides see }E

Alice does not use B=19, and Bob does not use A=8.

A=8\quad B=19

The replacement makes each endpoint do correct math with the wrong public value.

\text{same table, different transcript}