Chapter Review
E-mail is one of the oldest and most popular applications on the Internet. Security was not a primary concern when it was created, and many extensions to the protocol, while greatly increasing the functionality to users, have increased security problems. The MIME extensions allowed file attachments and HTML mail, which allowed the e-mail transfer of viruses and Trojan programs. E-mail software that is capable of interpreting HTML also opened the door for self-installing e-mail worms. E-mail also offers simple annoyances, such as unwanted commercial spam and the hoax e-mails that never seem to die out. Worst of all is the complete lack of privacy and weak authentication inherent in e-mail. S/MIME and PGP attempt to reduce some of ...
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