RIJNDAEL / AES

[Karol Pietrzak]

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hello.
i'm a big advocate of open-standards, and it's only natural that i
jumpted on the RIJNDAEL bandwagon.  i currently have the following two
lines in my ~/.gnupg/options :

cipher-algo RIJNDAEL256
s2k-cipher-algo RIJNDAEL256

however, RIJNDAEL is pretty new, and that standing, it has not
withstood the scrutiny for as long as something a little older like
CAST5 (which i've used previous of AES).  then again, if it's good
enough for the NSA, it's good enough for me.
is my rationale correct?  am i doing the right thing?
neat pick: PGP 7.0.3 says the cipher is AES-128.  I thought i'm using
RIJNDAEL_256_ ...  i read somewhere PGP 7.0.3 isn't RFC2440 compaint. 
is this the reason?
also, what's the difference between RIJNDAEL256 , RIJNDAEL192, and
just plain RIJNDAEL ?
thank you for everyone's time.

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--
noodlez:   Karol Pietrzak
GPG/PGP-KeyID: 0x2BBE5057