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Niederreiter not CPA secure

gp flag

How to prove that Niederreiter Crypto System not secure against Chosen-plaintext attack (CPA).

poncho avatar
my flag
Hint: if we are given a string $s$ which may be a valid code word (without errors), or which might not be, how could we determine which it is?
kodlu avatar
sa flag
also, this would work for any code based cryptosystem
Maarten Bodewes avatar
in flag
Please be so kind to take care and review your question before posting. We do allow to ask for hints w.r.t. assignments, but please provide your own thoughts / tries as well; we're not allowing homework dumps.
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