Beginner Question:Gnupg Decryption

Hello everybody,

When I encrypt an email message with gnupg for multiple email
recipients and then decrypt it again, I was under the assumption that
I would need to specify both, the private keys passphrase and the key-
id in order to decrypt


gpg --default-key pgp1@xxxxxxx --passphrase pgp4 --decrypt

However, I can decrypt without any --default-key parameter

gpg --decrypt --passphrase pgp4


That made me think. If one email recipients uses a weak key, other
email recipients could burteforce the message and easily detect weak
passwords.

Do I miss something here?

.

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