question to crypto experts

[Robert J. Hansen]

> basically, this is an encrypted xml file with an header
> 
> my question is : knowing that the file will begin with "<xml" does it 
> make it weak to decryption attack, and can it be used to get the key?

This is called a "known plaintext" attack.

All modern encryption algorithms are highly resistant to known plaintext 
attacks. GnuPG as a whole is highly resistant to known plaintext attacks.
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