Lai–Massey scheme

The Lai–Massey scheme is a cryptographic structure used in the design of block ciphers, an alternative to the Feistel network for converting a non-invertible keyed round function to an invertible keyed cipher. It is used in IDEA and IDEA NXT. The scheme was originally introduced by Xuejia Lai with the assistance of James L. Massey, hence the scheme's name, Lai-Massey.

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