Web Reference: Oct 3, 2025 · Understanding IDEA's structure and principles provides valuable insights into the evolution of cryptographic algorithms and the fundamental concepts of secure communication. IDEA stands for International Data Encryption Algorithm. IDEA is a block cipher developed by James Massey and Xuejia Lai and initially specified in 1991. It has a 128-bit key length and works with 64-bit blocks. 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.
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