While executing the security server program, the server: verifies client access rights via a first encryption means, generates, encrypts and transmits to the client a random port number and a session key, and detects establishment of {HEAD ~ a second connection} between {TAIL ~ the client} and a random port of the server 
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While executing the security server program , the server : verifies client access rights via a first encryption means , generates , encrypts and transmits to the client a random port number and a session key , and detects establishment of { HEAD ~ a second connection } between { TAIL ~ the client } and a random port of the server
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