KDDI Research, Inc. Print


A high-speed, lightweight stream cipher algorithm ISO/IEC 18033-4-international standard
Officially recommended as as a recommended stream cipher in the e-Government Recommended Ciphers List in Japan


KCipher-2 is cipher algorithm that employs a proprietary architecture to enable high-speed encryption and decryption processing that is 7 to 10 times faster than that of Advanced Encryption Standard (AES) and other standards. Applying the KCipher-2 algorithm enables higher levels of security for a range of services, including multi-media content services and broadband communication services. In 2012, KCipher-2 was included in the ISO/IEC 18033-4 standards for stream cipher algorithms, and Japan’s Ministry of Internal Affairs and Communications and Ministry of Economy, Trade and Industry announced its selection as an e-Government-recommended cipher in March 2013.



World’s Fastest, Most Lightweight in a Mobile Phone


Exceptionally High Level of Security Margin


Specifications in English, presented at International Conference SECRYPT2007 (305kbyte)

Sales license

In line with order, available as embedded or customized software, or in other variations.