Question

Discuss why the radix-64 conversion is useful for an e-mail application.

Answer 1

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Most email mail systems only permit the use of blocks consisting of ASCII text, so PGP must provide a service (Radix-64, or R64) of converting the raw 8-bit binary stream to a stream of printable ASCII characters. The reason R64 conversion is useful for an email application is because it blindly converts the input stream to radix-64 format regardless of the content, even if the input happens to be ASCII text. In other words, if the message is signed (but not encrypted) and the conversion is applied to the entire block, the output will still be unreadable to the casual observer. This provides a certain degree of confidentiality.

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