Web Reference: Oct 3, 2025 · IDEA was first introduced in 1991 by James Massey and Xuejia Lai as a replacement for the Data Encryption Standard (DES). It was designed to address the growing concerns about the security of DES, particularly its relatively short key length. In cryptography, the International Data Encryption Algorithm (IDEA), originally called Improved Proposed Encryption Standard (IPES), is a symmetric-key block cipher designed by James Massey of ETH Zurich and Xuejia Lai and was first described in 1991. International Data Encryption Algorithm (IDEA) The international Data Encryption Algorithm is a symmetric block cipher developed by Xuejia Lai and James Massey of the Swiss Federal Institute of Technology in 1990.
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