s using the same key twice in one$-$time pad secure $($i$.$e$.,$ Encryption: M $$ K $$ K $=$ C;

Decryption: C $$ K $$ K $=$ M$)?$ Why? Please explain in detail. $($hint: you should explain

if P$($M$|$C$)?=$ P$($M$)$ by using mathematical proof. Only textual explanation without the

inclusion of mathematical formulas will result in an incomplete analysis and, therefore,

may lead to a deduction in grading.$)$