In this paper, some observations on Camellia are presented, by which the Square attack and the Collision attack are improved. 11-round 256-bit Camellia without FL function is breakable with complexity of 2 250 encryptions. 9-round 128-bit Camellia without FL function is breakable with the complexity of 2 90  encryptions. And 10-round 256-bit Camellia with FL function is breakable with the complexity of 2 210  encryptions and 9-round 128-bit Camellia with FL function is breakable with the complexity of 2 122  encryptions. These results are better than any other known results. It concludes that the most efficient attack on Camellia is Square attack.
['Duo Lei', 'Li Chao', 'Keqin Feng']
New observation on camellia