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國際資料加密演算法(英語:International Data Encryption Algorithm,縮寫為 IDEA),最早稱為改良建議加密標準Improved Proposed Encryption Standard,IPES),是密碼學上一種對稱金鑰分組密碼,由James Massey與來學嘉設計,在1991年首次提出。這個演算法的提出,是為了取代舊有的資料加密標準(DES)。[2]現在IDEA被認為是不安全的加密演算法。

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IDEA
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An encryption round of IDEA
概述
設計者來學嘉James Massey
衍生自PES
繼承演算法MMB, MESH, Akelarre,
IDEA NXT (FOX)
密碼細節
金鑰長度128 bits
分組長度64 bits
結構Lai-Massey scheme
重複回數8.5
最佳公開破解
The key can be recovered with a computational complexity of 2126.1 using narrow bicliques. This attack is computationally faster than a full brute force attack, though not, as of 2013, computationally feasible.[1]
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