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Alternative: just post the message unencrypted
Then post another message, encrypted with my secret key:
Article #12345 on this BBS was really posted by me!
Anyone who wants to can decrypt the secret message
Which could come only from me
And which swears that I was responsible for #12345
It's really short, so it's cheap to decrypt
There's still a drawback
The BBS operator can change around article #12345 so that it says something else
continued...
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