An encryption round of IDEA
General
Designers Xuejia Lai and James Massey
Derived from PES
Successors MMB, MESH, Akelarre,
IDEA NXT (FOX)
Cipher detail
Key sizes 128 bits
Block sizes 64 bits
Structure Lai-Massey scheme
Rounds 8.5
Best public cryptanalysis
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]