| 主权项 |
1. A method of providing a document using a secure bar code, the method comprising:
encrypting, via a computing device including a bar code reader, the document to generate an encrypted document; mixing together, via the computing device, bits for a security credential with bits for the encrypted document to generate a set of mixed bits having a predetermined order, wherein the security credential is for decrypting the encrypted document; providing, to the computing device, scrambling information that specifies the predetermined order, where the scrambling information is shared between a portion of the computing device and the bar code reader; inserting, via the computing device, the set of mixed bits into the secure bar code; and outputting the secure bar code, wherein the computing device knows the predetermined order and is configured to read the secure bar code using the bar code reader according to the received scrambling information, un-mix the mixed bits based on the predetermined order, and decrypt the encrypted document with the security credential. |
