known-plaintext attacks

Jan Jansen japnews at
Wed Jun 11 04:05:21 CEST 2008


1. Is the AES-Encryption of a file by gnupg vulnerable to 
known-plaintext attacks ?
2. Does this depend on the lenght of the plaintext ?
	2.1 Is a strong Passphrase even safe, if the size of the known 
plaintext is just 1 Byte or even 10 GB ?
3. Is it possible for sombody, who does not know the strong Passphrase, 
to guess reliably, if the encrypted data contains a known file ?
4. Why or Why not (1.,2.,3 )?



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