1. NIST, National Institute of Standards and Technology, "Entity Authentication using Public Key Cryptography", FIPS 196, http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901429 [Retrieved March 2016]
2. NIST, National Institute of Standards and Technology, "Electronic Authentication Guideline", NIST SP 800-63-1, http://csrc.nist.gov/publications/nistpubs/800-63-1/SP-800-63-1.pdf [Retrieved March 2016]
3. NIST, National Institute of Standards and Technologies, "Validated 140-1 and FIPS 140-2 Cryptographic Modules", Item 1111, http://csrc.nist.gov/groups/STM/cmvp/documents/140-1/140val-all.htm [Retrieved March 2016]
4. NIST, National Institute of Standards and Technologies, "FIPS 201 - Personal Identity Verification (PIV) of Federal Employees and Contractors", March 2006, http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.201-2.pdf [Retrieved June 2016]
5. GSA, US Federal Government, "HSPD-12 Approved Products List", http://www.idmanagement.gov/approved-products-list [Retrieved June 2016]