Why perfect secrecy requires a key as long as the message

Perfect encryption needs a key as long as the message

Claude Shannon showed that perfect secrecy requires a key containing at least as much information as the message itself. A correctly used one-time pad meets this rule and can provide perfect secrecy.

Cuba became the first country recognized for eliminating mother-to-child HIV transmission

In 2015, the World Health Organization recognized Cuba as the first country to achieve validated elimination of mother-to-child transmission of HIV and syphilis as public-health problems. This did not mean transmission had become biologically impossible or that no cases could occur. It meant prevention, testing and treatment had reduced transmission to very low levels under established public-health criteria.

A shut-down nuclear reactor still produces a lot of heat

More Than 6% Of Normal Heat

Stopping nuclear fission does not immediately stop a reactor from producing heat. Radioactive materials continue to decay, initially producing more than 6% of the reactor's normal heat. Cooling must continue or the fuel can overheat and melt.

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Why perfect secrecy requires a key as long as the message

Perfect encryption needs a key as long as the message

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