Multiple-stage system and method for processing encoded messages

A non-transitory computer-readable storage medium encoded with instructions that cause a data processor to perform a method that processes an encoded message at a wireless mobile communication device, said method comprising the steps of:

• performing by the wireless mobile communication device a first decoding operation upon the encoded message so as to generate a partially decoded message, wherein the first decoding operation performs at least one of the decoding operations which are to be performed upon the encoded message;
• storing the partially decoded message to a memory of the wireless mobile communication device;
• retrieving the partially decoded message from the memory in response to a request to access the received message;
• and
• performing by the wireless mobile communication device a second decoding operation upon the partially decoded message after receiving the request to access the received message so as to generate a decoded message for use within the wireless mobile communication device;
• wherein the message is encoded by being signed and then encrypted, wherein the first decoding operation performed before receiving the request to access the received message comprises decoding operations associated with transmission encoding, retrieval of at least one decryption key, and partial decryption of the message using the retrieved decryption key, wherein the partial decryption of the message does not involve decrypting a signature of the message;
• and wherein the second decoding operation comprises decryption of the partially decoded message using the retrieved decryption key and signature verification upon the decrypted message.

A system that processes an encoded message at a wireless mobile communication device, wherein a plurality of decoding operations are to be performed upon the encoded message before the message is used within the wireless mobile communication device, said system comprising:

• a first decoding stage having a data access connection to the encoded message, said first decoding stage performing a first decoding operation upon the encoded message so as to generate a partially decoded message, wherein the first decoding stage performs at least one of the plurality of decoding operations;
• a memory that stores the partially decoded message;
• and
• a second decoding stage having a data access connection to the partially decoded message stored in the memory, wherein the second decoding stage performs a second decoding operation upon the partially decoded message in response to a request to access the received message so as to generate a decoded message for use within the wireless mobile communication device;
• said first decoding stage and said second decoding stage executing on a data processor of the wireless mobile communication device;
• wherein the message is encoded by being signed and then encrypted, wherein the first decoding operation performed before receiving the request to access the received message comprises decoding operations associated with transmission encoding, retrieval of at least one decryption key, and partial decryption of the message using the retrieved decryption key, wherein the partial decryption of the message does not involve decrypting a signature of the message;
• and wherein the second decoding operation comprises decryption of the partially decoded message using the retrieved decryption key and signature verification upon the decrypted message.