Digital Signature
Have you received an e-mail from your friend and later you find that he didn’t send it or he sent something different? Nothing unbelievable! Time to security awareness! Nowadays we use e-mail for sending important documents and that is the reason why we need digital signature. It insures uniqueness and document integrity. The important tool in this theory we use is cryptography. But remember that this is just the drop in the ocean of information security!
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