Name
Abstract | ||
|---|---|---|
Kiasu-BC and Joltik-BC are internal tweakable block ciphers of authenticated encryption algorithms Kiasu and Joltik submitted to the CAESAR competition. Kiasu-BC is a 128-bit block cipher, of which tweak and key sizes are 64 and 128 bits, respectively. Joltik-BC-128 is a 64-bit lightweight block cipher supporting 128 bits tweakey. Its designers recommended the key and tweak sizes are both 64 bits. In this paper, we propose improved meet-in-the-middle attacks on 8-round Kiasu-BC, 9-round and 10-round Joltik-BC-128 by exploiting properties of their structures and using precomputation tables and the differential enumeration. For Kiasu-BC, we build a 5-round distinguisher to attack 8-round Kiasu-BC with 2(109) plaintext-tweaks, 2(112.8) encrytions and 2(92.91) blocks. Compared with previously best known cryptanalytic results on 8-round Kiasu-BC under chosen plaintext attacks, the data and time complexities are reduced by 2(7) and 2(3.2) times, respectively. For the recommended version of Joltik-BC-128, we construct a 6-round distinguisher to attack 9-round Joltik-BC-128 with 2(53) plaintext-tweaks, 2(56.6) encryptions and 2(52.91) blocks, respectively. Compared with previously best known results, the data and time complexities are reduced by 2(7) and 2(5.1) times, respectively. In addition, we present a 6.5-round distinguisher to attack 10-round Joltik-BC-128 with 2(53) plaintext-tweaks, 2(101.4) encryptions and 2(76.91) blocks. |
Year | DOI | Venue |
|---|---|---|
2019 | 10.1093/comjnl/bxz059 | COMPUTER JOURNAL |
Keywords | Field | DocType |
tweakable block ciphers,tweakey,Kiasu-BC,Joltik-BC,meet-in-the-middle attacks | Computer science,Computer security,Distributed computing,Meet in the middle | Journal |
Volume | Issue | ISSN |
62 | 12 | 0010-4620 |
Citations | PageRank | References |
0 | 0.34 | 0 |
Authors | ||
8 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Ya Liu | 1 | 82 | 13.16 |
| Yifan Shi | 2 | 105 | 8.72 |
| Dawu Gu | 3 | 644 | 103.50 |
| Zhiqiang Zeng | 4 | 139 | 16.35 |
| Fengyu Zhao | 5 | 0 | 1.69 |
| Wei Li | 6 | 93 | 15.69 |
| Zhiqiang Liu | 7 | 31 | 11.71 |
| Yang Bao | 8 | 0 | 0.34 |