The Scream cipher is a word-based stream cipher developed by Shai Halevi, Don Coppersmith and Charanjit Jutla from IBM.
The general design of Scream is close to the design of SEAL with block cipher-like round functions.
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.
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.