KASUMI is a block cipher used in UMTS, GSM, and GPRS mobile communications systems.
In UMTS, KASUMI is used in the confidentiality (f8) and integrity algorithms (f9) with names UEA1 and UIA1, respectively.[1]
In GSM, KASUMI is used in the A5/3 key stream generator and in GPRS in the GEA3 key stream generator.
KASUMI was designed for 3GPP to be used in UMTS security system by the Security Algorithms Group of Experts
(SAGE), a part of the European standards body ETSI.[2]
Because of schedule pressures in 3GPP standardization, instead of developing a new cipher, SAGE agreed with
3GPP technical specification group (TSG) for system aspects of 3G security (SA3) to base the development
on an existing algorithm that had already undergone some evaluation.[2]
They chose the cipher algorithm MISTY1 developed[3]
and patented[4]
by Mitsubishi Electric Corporation.
The original algorithm was slightly modified for easier hardware implementation and to
meet other requirements set for 3G mobile communications security.
KASUMI is named after the original algorithm MISTY1 — 霞み (hiragana かすみ, romaji kasumi) is the Japanese word for "mist".
In January 2010, Orr Dunkelman, Nathan Keller and Adi Shamir released a paper showing that they could break Kasumi with a related-key attack and very modest computational resources; this attack is ineffective against MISTY1.[5]
^"Draft Report of SA3 #38" (PDF). 3GPP. 2005.
^ ab
"General Report on the Design, Speification and Evaluation of 3GPP Standard Confidentiality and Integrity Algorithms" (PDF). 3GPP. 2009.
^Matsui, Mitsuru; Tokita, Toshio (Dec 2000). "MISTY, KASUMI and Camellia Cipher Algorithm Development" (PDF). Mitsubishi Electric Advance. 100. Mitsubishi Electric corp.: 2–8. ISSN 1345-3041. Archived from the original (PDF) on 2008-07-24. Retrieved 2010-01-06.
^US 7096369, Matsui, Mitsuru & Tokita, Toshio, "Data Transformation Apparatus and Data Transformation Method", published Sep. 19, 2002, issued Aug. 22, 2006
^Orr Dunkelman; Nathan Keller; Adi Shamir (2010-01-10). "A Practical-Time Attack on the A5/3 Cryptosystem Used in Third Generation GSM Telephony". {{cite journal}}: Cite journal requires |journal= (help)
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