On April 29th 2017 a user in the official #cicadasolvers IRC channel discovered a new/unknown PGP signed message by Cicada 3301.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Beware false paths. Always verify PGP signature from 7A35090F.
3301
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Version: CicadaPG v.3301
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-----END PGP SIGNATURE-----
Message is signed with 0x7A35090F key. Date of signature is: Signed on 2017-04-04 23:23 GMT