| Presentation | 2012-11-26 Scan-based Attack against Camellia Cryptosystems Hirokazu KODERA, Masao YANAGISAWA, Nozomu TOGAWA, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Camellia is a common key cryptosystem and it has higher tolerance for cryptoanalysis than AES. In addition, Camellia has a processing speed which is equivalent to AES. Because Camellia can share encryption processing with decryption processing and it doesn't use arithmetic operation, it can be implemented hardware with the small number of gates. Recently, scan-based attacks are reported which retrieve secret keys with scanned data obtained from scan chain. There are no reports on scan-based attack against Camellia. In this paper, we propose a scan-based attack method against Camellia. Camellia has an 18-round Feistel structure which repeats the round function 18 times. In our proposed method, attackers input two plaintexts to a Camellia cryptosystem LSI and obtain two scanned data. By XORing them, influence of S-funtion in the round function can be removed. We focus on specific bit column data of XORed scanned data and, by observing transition of correspoding registers. Then, attackers retrieve four equivalent keys and restore a secret key in Camellia. We showed that secret keys of Camellia are restored with our proposed method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | camellia / side-channel attacks / scan-path test / scan chain / scan-based attack |
| Paper # | VLD2012-68,DC2012-34 |
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| Conference Information | |
| Committee | DC |
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| Conference Date | 2012/11/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Dependable Computing (DC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Scan-based Attack against Camellia Cryptosystems |
| Sub Title (in English) | |
| Keyword(1) | camellia |
| Keyword(2) | side-channel attacks |
| Keyword(3) | scan-path test |
| Keyword(4) | scan chain |
| Keyword(5) | scan-based attack |
| 1st Author's Name | Hirokazu KODERA |
| 1st Author's Affiliation | Grad. of Fundamental Science and Engineering, Waseda University() |
| 2nd Author's Name | Masao YANAGISAWA |
| 2nd Author's Affiliation | Grad. of Fundamental Science and Engineering, Waseda University |
| 3rd Author's Name | Nozomu TOGAWA |
| 3rd Author's Affiliation | Grad. of Fundamental Science and Engineering, Waseda University |
| Date | 2012-11-26 |
| Paper # | VLD2012-68,DC2012-34 |
| Volume (vol) | vol.112 |
| Number (no) | 321 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |