1. A system for processing an encrypted message, comprising: a first memory location configured to store an encrypted message associated with a first asymmetric encryption key pair comprising a first public encryption key and a first private encryption key; a second memory location configured to store a second public encryption key associated with a second asymmetric encryption key pair comprising the second public encryption key and a second private encryption key; at least one automated processor configured to: (a) establish an asymmetric cryptographic session key comprising a first session key and a second session key; and (b) process the encrypted message from a first encrypted form to a second encrypted form, in an integral process substantially without intermediate decryption of the encrypted message to a plaintext message, using a composite key derived at least in part from the first private encryption key, a second public encryption key, and the first session key; and a communication port configured to communicate information to define the at least one asymmetric cryptographic session key, and to communicate the encrypted message in the second encrypted form.