Arjen Lenstra
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Arjen K. Lenstra is a Dutch mathematician. He studied mathematics at the University of Amsterdam. He is currently a professor at the EPFL (Lausanne), in the Laboratory for Cryptologic Algorithms, and previously worked for Citibank and Bell Labs.
Lenstra is active in cryptography, especially in areas such as integer factorization and the XTR cryptosystem. He has been involved in the successful factoring of several RSA numbers.
Lenstra's brother Hendrik Lenstra is a professor in mathematics at Leiden University and his brother Jan Karel Lenstra is the director of CWI.