Abstract: The invention relates to rapid cryptography methods and devices for secure data access. A private key is temporarily created for a cryptography use on a computer for decrypting a document. A device comprising a second data matrix, which is external to the computer, is read by the computer, which processes the second data matrix using a first data matrix already present on the computer. Then, the first data matrix provides the means for stepping through the second data matrix to create a private key. Next, the private key is erased immediately after the private key is created and used in a cryptography process for accessing secure data. The first and second data matrices are hidden by the user, and the private key is not stored, but instead is temporarily re-created as needed only for rapidly accessing secure data.