| Presentation | 2003/3/20 S-Box-and-Bit-Sliced Analysis of DES (VI) : Information-Theoretic Sensitivity Analysis of last-round-key of DES using Maximum Likelihood Estimators for i.i.d. sequence Tohru KOHDA, Takayuki TSURUTA, Hiroshi ISHIHARA, Shoji SHIBA, Nobuoki EJIMA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Dual representation of 2-round DES characteristics, denoted by S_i, is introduced whose input and output random vectors consist of 6-dimensional lefthalf bit and 12-dimensional righthalf bit. We can observe frequencies between an output random variable, being EOR-operated with an input lefthalf bit and its input random 6-dimensional vector observed in the last-round S-box, referred to as dual trellis module. We introduce the likelihood function for input lefthalf bit sequence, based on the binomial distribution with probability 1/2+δ to guess the associated key vector. It is shown from the statistical point of view that the precise estimate of δ requires δ^<-2> ciphertexts only. Simple numerical simulation results show that the X^2 statistics play an important role in determining the last-round-key vectors correctly. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | DES / S-box-and-bit-slicing / dual representation / i.i.d. sequence / maximum-likelihood estimator / X^2-test / resistance for ciphertext-only attack |
| Paper # | IT2002-80,ISEC2002-138,SST2002-186,ITS2002-163 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2003/3/20(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Information Security (ISEC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | S-Box-and-Bit-Sliced Analysis of DES (VI) : Information-Theoretic Sensitivity Analysis of last-round-key of DES using Maximum Likelihood Estimators for i.i.d. sequence |
| Sub Title (in English) | |
| Keyword(1) | DES |
| Keyword(2) | S-box-and-bit-slicing |
| Keyword(3) | dual representation |
| Keyword(4) | i.i.d. sequence |
| Keyword(5) | maximum-likelihood estimator |
| Keyword(6) | X^2-test |
| Keyword(7) | resistance for ciphertext-only attack |
| 1st Author's Name | Tohru KOHDA |
| 1st Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University() |
| 2nd Author's Name | Takayuki TSURUTA |
| 2nd Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University |
| 3rd Author's Name | Hiroshi ISHIHARA |
| 3rd Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University |
| 4th Author's Name | Shoji SHIBA |
| 4th Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University |
| 5th Author's Name | Nobuoki EJIMA |
| 5th Author's Affiliation | Department of Medical Information Analysis, Oita Medical University |
| Date | 2003/3/20 |
| Paper # | IT2002-80,ISEC2002-138,SST2002-186,ITS2002-163 |
| Volume (vol) | vol.102 |
| Number (no) | 744 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |