Key Recovery Attack on Hybrid Cipher SCB Algorithm

According to the flaws in the design of the stream cipher part of SCB(senior cross breed) algorithm,the initial key could be recovered with the computational complexity of O(244) if the key stream of the stream cipher was known.To acquire the keystream of the stream cipher,a differential fault attack was proposed by using word oriented fault model for one bit random fault.When 640 faults were induced,the success rate could achieve 99.4%.The computational complexity to recover the 256 bit key was O(244).