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I am a student taking cryptography this semester. I was just wondering why can't we use this simple protocol?

Alice ----Open Connection--> Bob

Alice <-- Cert$_b$--- Bob

Alice --- {K$_{AB}$}$_{Bob}$ -->Bob

Assume bob is the server and we're only interested in one way authentication. Is there anything wrong with it in terms of security and performance?

I am a student taking cryptography this semester. I was just wondering why can't we use this simple protocol?

Alice → Open Connection → Bob
Alice ← Cert$_b$ ← Bob
Alice → {K$_{AB}$}$_{Bob}$ → Bob

Assume bob is the server and we're only interested in one way authentication. 
Is there anything wrong with it in terms of security and performance?

I am a student taking cryptography this semester. I was just wondering why can't we use this simple protocol?

Alice ----Open Connection--> Bob

Alice <-- Cert$_b$--- Bob

Alice --- {K$_{AB}$}$_{Bob}$ -->Bob

Is there anything wrong with it in terms of security and performance?

I am a student taking cryptography this semester. I was just wondering why can't we use this simple protocol?

Alice ----Open Connection--> Bob

Alice <-- Cert$_b$--- Bob

Alice --- {K$_{AB}$}$_{Bob}$ -->Bob

Assume bob is the server and we're only interested in one way authentication. Is there anything wrong with it in terms of security and performance?