It Is basically set of procedures on following which one can ensure that the data, which it transmitting, will reach the destination safely and will deliver it only after ensuring the validity of the receiver.
There are a number of methods that aim at providing security over the Internet.
Cryptograph systems: This involves coding messages so that only authorized users can read them.
Authentication: This is the process of verifying that the concerned person is the user of the account and that he has the rights of particular services on a network.
Use of SIM (Subscriber Identity Module)
Digital Signatures
Using a digital certificate issued by a CA (Certificate of Authority)
Use of firewalls: the source host to limit access uses Firewall.
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