Public-key encryption schemes are secure only if the authenticity of the is assured.

The answer is private key is known only to the recipient. This private key is used to decrypt messages which was encrypted with a public key and should only be accessible by the recipient of the payload.

adbusters is an oppressive not-for-profit organization, founded in 1989  determined to end capitalism. the goal is to  spread their message through a self published magazine (which contains no advertisements). the likely reason why adbusters publishes a magazine with spoof advertisements is that  adbusters wants to encourage consumers to think critically about ads. 

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