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A system is provided for secure data transmission. The system stores a public master key, private decryption key and secure messaging module for securely transmitting and receiving a digital model data file for transmission via a work order message. For transmitting and receiving the work order message, the system generate public encryption keys using a key generation algorithm in which each of the public encryption keys are unique to a designated message recipient and generated using an input including the public master key, a validity period, and an identifier of the designated message recipient. The system may also store a revocation list that includes identifiers of message recipients that have revoked access to the public master key or private decryption key, and based thereon determine whether or not to encrypt and transmit the work order message, or receive and decrypt the work order message.