What are the advantages & disadvantages of public key encryption?

What are the advantages & disadvantages of public key encryption?
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1 Answer

Answer :

Advantages:  
a) Remove the restriction of a shared secret key between two entities. Here each entity can create a  pair of keys, keep the private one, and publicly distribute the other one.  
b) The no. of keys needed is reduced tremendously. For one million users to communicate, only  two million keys are needed.  
Disadvantage:  
Calculating the cipher text using the long keys takes a lot of time. So it is not recommended for  large amounts of text.
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