This standard specifies the XTS cryptographic mode of operation for the Advanced Encryption Standard modes(AES) block cipher for block-oriented storage devices. Purpose The purpose of this standard is to define the XTS cryptographic mode while maintaining backward compatibility with existing implementations that are compliant with IEEE 1619-2007.Normative references The following referenced documents are indispensable for the application of this document (i.e.@ they must be understood and used@ so each referenced document is cited in text and its relationship to this document is explained). For dated references@ only the edition cited applies. For undated references@ the latest edition of the referenced document (including any amendments or corrigenda) applies. NIST FIPS-197@ Federal Information Processing Standard (FIPS) for the Advanced Encryption Standard (AES).1 1 FIPS publications are available from the National Technical Information Service@ 5285 Port Royal Road@ Springfield@ VA 22661@ USA. FIPS-197 is also available on-line from http://csrc.nist.gov/publications/fips/index.