how to recover secret key passphrase?

[ilf]

Markus Reichelt:
>> Over the years, I have used quite a number of keypairs. Unfortunately, I 
>> have forgotten the passphrase for some of them. But I do know potential 
>> parts of the passphrase. 
> This is ancient, but may help you https://www.vanheusden.com/nasty/

Thanks. But my problem is not the actual brute-forcing part, john is 
perfect for that. My problem is getting a usable input for john from the 
current the current private-keys-v1.d/ gpg-agent private key key store 
format.

-- 
ilf

If you upload your address book to "the cloud", I don't want to be in it.