Any of a set of keys for encryption

glenlow_at_pixelglow.com
Date: 11/09/05 

Date: 9 Nov 2005 07:03:53 -0800

Hi All

Is there any cipher or cryptosystem that allows any of a limited set of
keys to decrypt a message?

E.g. if D (K, C) is the decryption function, where K is the key and C
is the ciphertext,

then given an arbitrary set of keys K1, K2, K3 ... Kn,

D (K1, C) == D (K2, C) == D (K3, C) .... == D (Kn, C) == P

Would be interested especially if you can build this on top of a stream
cipher.

Cheers,
Glen Low, Pixelglow Software
www.pixelglow.com

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