Fortran What does the *4 mean in integer*4 in fortran77?

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How is
Code: 
integer*4
different from
Code: 
integer
?
 
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dimensionless said:
How is
Code: 
integer*4
different from
Code: 
integer
?

integer*4 is an expression where you multiply integer by 4?
 
Integer*1 => 1 byte integer variable
Integer*2 => 2 bytes integer variable
Integer*4 => 4 bytes integer variable
Integer => 4 bytes by default but can be compiler dependent
 
Thread 'Is this public key encryption?'

Thread 'Is this public key encryption?'

I've tried to intuit public key encryption but never quite managed. But this seems to wrap it up in a bow. This seems to be a very elegant way of transmitting a message publicly that only the sender and receiver can decipher. Is this how PKE works? No, it cant be. In the above case, the requester knows the target's "secret" key - because they have his ID, and therefore knows his birthdate.
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