[Cialug] dual passphrase encryption

[Matthew Nuzum]

(on behalf of a friend, however in my own words)

I'm no encryption expert. I've seen a number of ways to encrypt something if
you have a password, so that's no big deal. What I'm wondering is if there's
a way to encrypt something so that either one of two passwords can decrypt
it. Ideally, the passphrase that encrypts something is unable to decrypt it.

The goal is to create a web application that can store a secret message.
Someone types a message, the server encrypts it and one of two people can
decrypt it.

Right now the tool being used is gnupg, but it's getting harder and harder
to make this situation work. Increasingly the people involved are running
Windows Vista, some 64b, and are not computer literate. Supposedly getting
gnupg to work on 64b windows is quite a chore. The person actually has told
me its not possible, apparently he's read messages between the gnupg team
who said that some security feature of 64b windows prevents porting. I'm not
sure if this is accurate but I don't know of a solution.

Either way, one particular example of why gnupg isn't working is because a
person he deals with is dyslexic and is not able to complete the
installation of gnupg. Ideally there'd be a text field and a big button and
you enter your pass phrase and click the big button and you get your email.

Know of any solution?

-- 
Matthew Nuzum
newz2000 on freenode
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