The Scream cipher is a word-based stream cipher developed by Shai Halevi, Don Coppersmith and Charanjit Jutla from IBM. In Cryptography, a stream cipher is a symmetric key Cipher where plaintext bits are combined with a Pseudorandom cipher bit stream ( Keystream Don Coppersmith is a Cryptographer and Mathematician. He was involved in the design of the Data Encryption Standard Block cipher at IBM International Business Machines Corporation abbreviated IBM and nicknamed "Big Blue", is a multinational Computer Technology
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. In Cryptography, SEAL (Software-Optimized Encryption Algorithm is a very fast Stream cipher optimised for machines with a 32- Bit Word size
The general design of Scream is close to the design of SEAL with block cipher-like round functions. In Cryptography, a block cipher is a symmetric key Cipher which operates on fixed-length groups of Bits termed blocks, with an 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. In Cryptography, a substitution box (or S-box) is a basic component of Symmetric key algorithms In Block ciphers they are typically used to obscure In Cryptography, the Advanced Encryption Standard ( AES) also known as Rijndael, is a Block cipher adopted as an Encryption 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.
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