Forging fingerprints/KeyID?

[Christoph Anton Mitterer]

Hi.

Somewhere (unfortunately I've lost the URL) I've read about forging 
fingerprints and/keyIDs (not sure)....
Meaning that an attacker could create a key (but as far as I remember 
with a different keysize onlz) that has the same fingerprint and/or 
keyID as another key.

Is that true?
Are there any information about that issue? How it works, how I can 
secure myself against it, etc.

Best wishes,
Chris.
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