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Why our RSA key do not work on Windows


I promote encryption in my union, association and workplace. Currently, not every computer run linux, and some still run windows.

However, I succeed in making everyone use thunderbird; I try now to make every email encrypted. It work pretty well until I try to encrypt a shared address (let say "contact@org") :

The RSA key work well on thunderbird on linux, but fail to decrypt email on thunderbird on windows.

What am I missing ? Thunderbird seems to support ECC encryption; is it more suited ?

in reply to menas

How do you handle retention for discovery purposes if every email is encrypted?
in reply to eleijeep

That's a good point. Even without encryption, we found search tools (such as those in thunderbird) quickly overwhelmed with heavy load (1-2 GB).
We manage shared mailbox in sorting mail in dedicated subfolders. This is not perfect, but in thoses context, manually check in those sub-folders is better that letting those information clear
in reply to menas

I'm referring to discovery, not search for end-users.

Most countries have regulations for companies to retain all internal communications for discovery purposes in the event that they are involved in a lawsuit.

in reply to eleijeep

Never heard about. According to wikipedia, only the US, the UK and the Ireland are subject to Discovery.
Fortunately we are not in this case; we are subject to the GDPR, so if we could strengthen private information send to us, we have to.
Furthermore, unions have special protections for their information
in reply to menas

Okay for the record :
- ECC key work
- According to one randoms on stackexchange, ECC is as safe as RSA, and now got a patent free implementation ¹²

So it seems that they is no reason to not use ECC instead of RSA in this context