Research Article

Random Fault Attacks on a Class of Stream Ciphers

Table 6

Partial Recovery of and with Different Numbers of Faults.

Recovery of or Recovery of
Known Plaintext attack Ciphertext Only attack

No. of Faults No. of Bits to Recover Success Rate No. of Faults Guessing Complexity Success
Rate
No. of Faults Guessing Complexity Success Rate

4 113 99.4% 16 97.4% 32 94.9%

5 119 99.4% 20 97.7% 40 95.5%

6 122 99.6% 24 98.6% 48 97.2%

7 124 99.7% 28 98.7% 56 97.5%

8 125 99.8% 32 99.3% 64 98.6%