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The Scream cipher is a word-based stream cipher developed by Shai Halevi, Don Coppersmith and Charanjit Jutla from IBM. The cipher is designed as a software efficient stream cipher. The authors describe the goal of the cipher to be a more secure version of the SEAL cipher. The general design of Scream is close to the design of SEAL with block cipher-like round functions. There are two versions of Scream. One of them, ''Scream-F'', reuses the S-boxes from the Advanced Encryption Standard (AES) block cipher, while the other, ''Scream'', internally generates new, key-dependent S-boxes as part of the initialization phase. The round function is also based on the AES-round function, but is narrower, 64 bits instead of 128 bits. The cipher uses a 128-bit key and a 128-bit nonce. It is efficient in software, running at 4-5 cycles per byte on modern processors. The cipher was presented at the Fast Software Encryption (FSE) conference in 2002. ==References== * (Scream: a software-efficient stream cipher ) (pdf) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Scream (cipher)」の詳細全文を読む スポンサード リンク
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