CMAC

In cryptography, CMAC (Cipher-based Message Authentication Code) is a block cipher-based message authentication code algorithm. It may be used to provide assurance of the authenticity and, hence, the integrity of binary data. This mode of operation fixes security deficiencies of CBC-MAC (CBC-MAC is secure only for fixed-length messages).

The core of the CMAC algorithm is a variation of CBC-MAC that Black and Rogaway proposed and analyzed under the name XCBC and submitted to NIST. The XCBC algorithm efficiently addresses the security deficiencies of CBC-MAC, but requires three keys. Iwata and Kurosawa proposed an improvement of XCBC and named the resulting algorithm One-Key CBC-MAC (OMAC) in their papers. They later submitted OMAC1, a refinement of OMAC, and additional security analysis. The OMAC algorithm reduces the amount of key material required for XCBC. CMAC is equivalent to OMAC1.

To generate an ℓ-bit CMAC tag (t) of a message (m) using a b-bit block cipher (E) and a secret key (k), one first generates two b-bit sub-keys (k₁ and k₂) using the following algorithm (this is equivalent to multiplication by x and x² in a finite field GF(2^b)). Let ≪ denote the standard left-shift operator and ⊕ denote exclusive or:

Will Clark

William Nuschler "Will" Clark, Jr. (born March 13, 1964) is a former first baseman in Major League Baseball best known for his years with the San Francisco Giants from 1986 to 1993. Clark was known by the nickname of "Will the Thrill." The nickname has often been truncated to simply, "The Thrill."

After a sensational career at Jesuit High School in New Orleans, Clark attended Mississippi State University, where he continued to flourish. Clark was inducted into the Mississippi State University Hall of Fame in 2003. Clark was inducted into the College Baseball Hall of Fame in 2006. He was inducted into the Bay Area Sports Hall of Fame on April 26, 2007 and the Mississippi Sports Hall of Fame on August 1, 2008.

He currently works in the San Francisco Giants front office after spending five seasons as an advisor for the Arizona Diamondbacks.

Olympics

Clark played a starring role for the 1984 U.S. Olympic team that yielded such future major leaguers as Barry Larkin and Mark McGwire. During the five-game Olympic tournament, Clark batted .429 with three home runs and eight RBIs.

Dave Matthews

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David John "Dave" Matthews (born January 9, 1967) is a South African-born American singer-songwriter, musician and actor, best known as the lead vocalist, songwriter, and guitarist for the Dave Matthews Band. Matthews was born in Johannesburg, South Africa and moved to Westchester County, New York at the age of 2. Matthews mainly plays acoustic guitar, which he started playing at age 9.

From 1991 to 2003, Matthews predominantly focused on songwriting and performing with the Dave Matthews Band, which he started in Charlottesville, Virginia in 1991. Since then, he has also done various solo performances and produced other records. During the period from 2000 to 2010, his band sold more tickets and earned more money than any other act in North America. The band's most recent album, Away from the World, released in 2012, made them the only group to have six consecutive studio albums debut at number one on the Billboard charts.

Tim Reynolds

Tim Reynolds (born 15 December 1957 in Wiesbaden, Germany) is a Grammy nominated multi-instrumentalist known as both a solo artist and as a lead guitarist for the Dave Matthews Band. One reviewer has declared Reynolds 'an under-rated master'.

Reynolds plays the guitar, piano, sitar, drums, violin, bass, keyboards, ethnic percussive instruments, solo djembe, harp, uses drum machines for special effects, and sings, although his performances are primarily instrumental rock music. As well as being the founding member of the band TR3, he is one of the musicians who performed at "Miller's", in Charlottesville Virginia, befriending and encouraging the bartender, a young Dave Matthews, to form a band of his own, introducing him to local musicians, several of whom make up the Dave Matthews Band. While Reynolds declined the offer to join as an official member, he recorded and toured as a sideman with the Dave Matthews Band from its inception until late 1998, rejoining them as a permanent member in June 2008. He often tours with Dave Matthews as an acoustic duo, in addition to performing as a member of Dave Matthews & Friends.