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GnuPG --symmetric & default password?


Hello,

This more of a GnuPG question, but since I use the Cygwin version, maybe somebody knows... :-)

In my GnuPG's "gpg.conf" there's the entry
default-recipient-self
so that all files I asymmetrically encrypt with "gpg --encrypt" are also decryptable by myself.


I wonder if there's a similar mechansism to the "--symmetric" version, with which you can encrypt files which you don't intend to give to other persons.
Normally, with "gpg --symmetric file" you always have to enter the passphrase.



Another question for the encryption specialists: How strong is GnuPG's --symmetric encryption with the default CAST5 algorithm compared to, for example, 7zip's encryption (Cygwin name "p7zip") which uses AES-256 ?


Thanks!

-Richard


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