For the purpose at hand, having some secrets accessible by multiple parties without sharing the same password comes in handy[1]. I'm surprised that this is not a feature of a lot of software that relies on encryption with keys based on passphrases.
[1]: example: https://code.google.com/p/cryptsetup/. I believe that the way it works is it encrypts the actual decryption key for data with keys derived from passphrases multiple times, so any one of the those passphrases can decrypt the key, which then can access the data.
[1]: example: https://code.google.com/p/cryptsetup/. I believe that the way it works is it encrypts the actual decryption key for data with keys derived from passphrases multiple times, so any one of the those passphrases can decrypt the key, which then can access the data.