KCipher-2

KCipher-2 is a stream cipher jointly developed by Kyushu University and Japanese telecommunications company KDDI. It is standardized as ISO/IEC 18033–4, and is on the list of recommended ciphers published by the Japanese Cryptography Research and Evaluation Committees (CRYPTREC). It has a key length of 128 bits, and can encrypt and decrypt around seven to ten times faster than the Advanced Encryption Standard (AES) algorithm.

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KCipher-2

General
Designers	KDDI Research [ja] Kyushu University [1]
First published	2007; 19 years ago (2007)[2]
Certification	CRYPTREC[3]
Cipher detail
Key sizes	128 bits[2]
State size	640 bits[2]

KCipher-2 is a stream cipher jointly developed by Kyushu University and Japanese telecommunications company KDDI.^[4] It is standardized as ISO/IEC 18033–4,^[5] and is on the list of recommended ciphers published by the Japanese Cryptography Research and Evaluation Committees (CRYPTREC).^[6] It has a key length of 128 bits, and can encrypt and decrypt around seven to ten times faster than the Advanced Encryption Standard (AES) algorithm.^[4]

Notes

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1. ^ "Product Outline｜KCipher-2 | KDDI Research". www.kddi-research.jp. Archived from the original on 2026-01-22. Retrieved 2026-01-22.
2. ^ ^{a b c} Kiyomoto, S.; Shin, W. (August 2013). A Description of the KCipher-2 Encryption Algorithm. IETF. doi:10.17487/RFC7008. RFC 7008.
3. ^ "CRYPTRECの電子政府推奨暗号、国産の「Camellia」や「KCipher-2」などリスト入り | 日経クロステック（xTECH）". 日経クロステック（xTECH） (in Japanese). 2013-03-26. Archived from the original on 2026-01-22. Retrieved 2026-01-22.
4. ^ ^{a b} Seto & Saitō 2019, p. 231.
5. ^ Hidaka 2012.
6. ^ Seto & Saitō 2019, p. 234.

References

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• Seto, Mitsuki; Saitō, Ken'ichi (2019). Tettei Kōryaku: Jōhō Shori Anzen Kakuho Shienshi Kyōkasho [Comprehensive Strategy: Registered Information Security Specialist Textbook] (in Japanese) (2020 ed.). Impress.
• Hidaka, Akira (17 February 2012). "Hayai, Karui, Namae no Yurai ga Omoshiroi? Mobairu Kiki ni Tekishita Angōka Gijutsu "KCipher-2" to wa?" [Fast, Light, a Name with an Interesting Origin? About "KCipher-2", an Encryption Algorithm Suited for Mobile Devices] (in Japanese). IT Media. Retrieved 2 October 2020.

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