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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) v · d · e Stream ciphers Widely used ciphers: RC4 · Block ciphers in stream mode      eSTREAM Portfolio:  Software: HC-128 · Rabbit · Salsa20/12 · SOSEMANUK   Hardware: Grain · MICKEY-128 · Trivium Other ciphers: A5/1 · A5/2 · E0 · FISH · ISAAC · MUGI · Panama · Phelix · Pike · Py · QUAD  · Scream · SEAL · SNOW · SOBER · SOBER-128 · VEST · WAKE Theory: Shift register · LFSR · NLFSR · Shrinking generator · T-function · IV Attacks: Correlation attack · Correlation immunity v · d · e Cryptography History of cryptography · Cryptanalysis · Cryptography portal · Outline of cryptography Symmetric-key algorithm · Block cipher · Stream cipher · Public-key cryptography · Cryptographic hash function · Message authentication code · Random numbers · Steganography This cryptography-related article is a stub. You can help Wikipedia by expanding it.v · d · e