Troops serving overseas used to have to rely on weekly post and a telephone call to stay in touch with friends and family.
Now troops in Afghanistan are taking their own laptop computers loaded with sophisticated encryption software to send e-mails securely back home.
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The software, Private Post, developed by Identum, allows the troops to send secure e-mails without having to ask relatives to install specialist software. The system ensures that the e-mails can only be read by the intended recipient.