Encrypting for multiple users

[Mohan Radhakrishnan]

Hi,

 

          We have several public keys and we use all of them to encrypt
files. Each recipient then decrypts the file using his or her own secret
key. Now some recipients lose their keys and replace them. Some new
encrypting keys get added. So we have several old files that the new
users cannot read.

 

Can a single user generate several sub secret keys and distribute to the
other recipients ? Does this solve the old file re-encryption problem
somehow by still retaining individual keys ?

 

Our policy does not allow sharing of keys. So it looks like the subkeys
have the same problem because all of them originate from a common key ?

 

Thanks,

Mohan

 

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