Xuejia Lai
Encyclopedia
Xuejia Lai is a cryptographer, currently a professor at Shanghai Jiao Tong University
. His notable work includes the design of the block cipher
IDEA
, the theory of Markov ciphers, and the cryptanalysis
of a number of cryptographic hash function
s. His book On the Design and Security of Block Ciphers (ISBN 978-3891915738) is frequently cited in cryptography papers.
Lai received a B.Sc. in electrical engineering
in 1982 and an M.Sc. in mathematics
in 1984 at Xidian University
(then known as Northwest Institute of Telecommunication Engineering). About 1982 he met James Massey
, who was visiting the university to give lectures in cryptography. Lai served as interpreter for these lectures. He later became one of Massey's doctoral students at ETH Zurich
, where he received his Ph.D.
in 1992. Together they designed the IDEA cipher.
Shanghai Jiao Tong University
Shanghai Jiao Tong University or SJTU), sometimes referred to as Shanghai Jiaotong University , is a top public research university located in Shanghai, China. Shanghai Jiao Tong University is known as one of the oldest and most prestigious universities in China...
. His notable work includes the design of the block cipher
Block cipher
In cryptography, a block cipher is a symmetric key cipher operating on fixed-length groups of bits, called blocks, with an unvarying transformation. A block cipher encryption algorithm might take a 128-bit block of plaintext as input, and output a corresponding 128-bit block of ciphertext...
IDEA
International Data Encryption Algorithm
In cryptography, the International Data Encryption Algorithm is a block cipher designed by James Massey of ETH Zurich and Xuejia Lai and was first described in 1991. As a block cipher, it is also symmetric. The algorithm was intended as a replacement for the Data Encryption Standard[DES]...
, the theory of Markov ciphers, and the cryptanalysis
Cryptanalysis
Cryptanalysis is the study of methods for obtaining the meaning of encrypted information, without access to the secret information that is normally required to do so. Typically, this involves knowing how the system works and finding a secret key...
of a number of cryptographic hash function
Cryptographic hash function
A cryptographic hash function is a deterministic procedure that takes an arbitrary block of data and returns a fixed-size bit string, the hash value, such that an accidental or intentional change to the data will change the hash value...
s. His book On the Design and Security of Block Ciphers (ISBN 978-3891915738) is frequently cited in cryptography papers.
Lai received a B.Sc. in electrical engineering
Electrical engineering
Electrical engineering is a field of engineering that generally deals with the study and application of electricity, electronics and electromagnetism. The field first became an identifiable occupation in the late nineteenth century after commercialization of the electric telegraph and electrical...
in 1982 and an M.Sc. in mathematics
Mathematics
Mathematics is the study of quantity, space, structure, and change. Mathematicians seek out patterns and formulate new conjectures. Mathematicians resolve the truth or falsity of conjectures by mathematical proofs, which are arguments sufficient to convince other mathematicians of their validity...
in 1984 at Xidian University
Xidian University
Xidian University is a university located in Xi'an, Shaanxi, People's Republic of China. The university is regarded by having strong science and engineering programs....
(then known as Northwest Institute of Telecommunication Engineering). About 1982 he met James Massey
James Massey
James Lee Massey is an information theorist andcryptographer, Professor Emeritus of Digital Technology at ETH Zurich. His notable work...
, who was visiting the university to give lectures in cryptography. Lai served as interpreter for these lectures. He later became one of Massey's doctoral students at ETH Zurich
ETH Zurich
The Swiss Federal Institute of Technology Zurich or ETH Zürich is an engineering, science, technology, mathematics and management university in the City of Zurich, Switzerland....
, where he received his Ph.D.
Ph.D.
A Ph.D. is a Doctor of Philosophy, an academic degree.Ph.D. may also refer to:* Ph.D. , a 1980s British group*Piled Higher and Deeper, a web comic strip*PhD: Phantasy Degree, a Korean comic series* PhD Docbook renderer, an XML renderer...
in 1992. Together they designed the IDEA cipher.