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Information about Cipherunicorn E

CIPHERUNICORN-E
General
NEC
1998
CIPHERUNICORN-A
CRYPTREC
Cipher detail
Key size(s):| 128 bits
Block size(s):| 64 bits
Feistel network
16
In cryptography, CIPHERUNICORN-E is a block cipher created by NEC in 1998. It is among the cryptographic techniques recommended for Japanese government use by CRYPTREC.

The algorithm has a 16-round modified Feistel network structure, with an additional key-dependent mixing function after every 2 rounds. The block size is 64 bits, and the key size 128 bits. The round function is fairly complicated, split into two nearly parallel computations. The first part (called the main stream by the designers) consists of XORs and S-box lookups, with a few choices influenced by the second part. This second function (called temporary key generation) uses more XORs and two operations which are equivalent to modular multiplications. Subkeys are added at various stages of both parts of the round function. There are 4 S-boxes in all, each with 8-bit inputs and outputs.

In 2000 NEC used the same high-level structure, with more elaborate components, to design the CIPHERUNICORN-A cipher.

CIPHERUNICORN-E's key schedule uses a nested Feistel network, based on some of the same building blocks as the cipher itself.

The complexity of CIPHERUNICORN-E's round function has made it difficult to analyze. Some limited analysis has been done on simplified variants, showing that they are likely resistant to both differential and linear cryptanalysis.

References

Block ciphers
 •  • [ e]
Algorithms: 3-Way | AES | Akelarre | Anubis | ARIA | BaseKing | Blowfish | C2 | Camellia | CAST-128 | CAST-256 | CIKS-1 | CIPHERUNICORN-A | CIPHERUNICORN-E | CMEA | Cobra | COCONUT98 | Crab | CRYPTON | CS-Cipher | DEAL | DES | DES-X | DFC | E2 | FEAL | FROG | G-DES | GOST | Grand Cru | Hasty Pudding Cipher | Hierocrypt | ICE | IDEA | IDEA NXT | Iraqi | Intel Cascade Cipher | KASUMI | KHAZAD | Khufu and Khafre | KN-Cipher | Libelle | LOKI89/91 | LOKI97 | Lucifer | M6 | MacGuffin | Madryga | MAGENTA | MARS | Mercy | MESH | MISTY1 | MMB | MWA | MULTI2 | NewDES | NOEKEON | NUSH | Q | RC2 | RC5 | RC6 | REDOC | Red Pike | S-1 | SAFER | SC2000 | SEED | Serpent | SHACAL | SHARK | Skipjack | SMS4 | Square | TEA | Triple DES | Twofish | UES | Xenon | xmx | XTEA | XXTEA | Zodiac
Design: Feistel network | Key schedule | Product cipher | S-box | SPN Attacks: Brute force | Linear / Differential / Integral cryptanalysis | Mod n | Related-key | Slide | XSL
Standardization: AES process | CRYPTREC | NESSIE Misc: Avalanche effect | Block size | IV | Key size | Modes of operation | Piling-up lemma | Weak key
Cryptography
 •  • [ e]
History of cryptography | Cryptanalysis | | Topics in cryptography
Symmetric-key algorithm | Block cipher | Stream cipher | Public-key cryptography | Cryptographic hash function | Message authentication code | Random numbers
NEC Corporation

Corporation TYO: 6701 , NASDAQ:  NIPNY
Founded Tokyo, Japan (1899)
Headquarters Tokyo, Japan

Key people Hajime Sasaki, Chairman of the Board; Akinobu Kanasugi, Vice Chairman of the Board; Kaoru Yano, President
Industry Electronics
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CIPHERUNICORN-A

General
NEC
2000

CIPHERUNICORN-E

CRYPTREC
Cipher detail
Key size(s):| 128, 192, or 256 bits

Block size(s):| 128 bits
nested Feistel network
16
In cryptography, CIPHERUNICORN-A
..... Click the link for more information.
CRYPTREC is the Cryptography Research and Evaluation Committee set up by the Japanese Government to evaluate and recommend cryptographic techniques for government and industrial use.
..... Click the link for more information.
In cryptography, the key size (alternatively key length) is the size of the digits used to create an encrypted text; it is therefore also a measure of the number of possible keys which can be used in a cipher, and the number of keys which must be tested to 'break' the
..... Click the link for more information.
block size. Both the input (plaintext) and output (ciphertext) are the same length; the output cannot be shorter than the input — this is logically required by the Pigeonhole principle and the fact that the cipher must be invertible — and it is simply undesirable for
..... Click the link for more information.
In cryptography, a Feistel cipher is a block cipher with a symmetric structure, named after IBM cryptographer Horst Feistel; it is also commonly known as a Feistel network. A large proportion of block ciphers use the scheme, including the Data Encryption Standard (DES).
..... Click the link for more information.
Cryptography (or cryptology; derived from Greek κρυπτός kryptós "hidden," and the verb γράφω gráfo "write" or λεγειν legein
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block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. When encrypting, a block cipher might take a (for example) 128-bit block of plaintext as input, and output a corresponding 128-bit block
..... Click the link for more information.
NEC Corporation

Corporation TYO: 6701 , NASDAQ:  NIPNY
Founded Tokyo, Japan (1899)
Headquarters Tokyo, Japan

Key people Hajime Sasaki, Chairman of the Board; Akinobu Kanasugi, Vice Chairman of the Board; Kaoru Yano, President
Industry Electronics
..... Click the link for more information.
CRYPTREC is the Cryptography Research and Evaluation Committee set up by the Japanese Government to evaluate and recommend cryptographic techniques for government and industrial use.
..... Click the link for more information.
In cryptography, a Feistel cipher is a block cipher with a symmetric structure, named after IBM cryptographer Horst Feistel; it is also commonly known as a Feistel network. A large proportion of block ciphers use the scheme, including the Data Encryption Standard (DES).
..... Click the link for more information.
block size. Both the input (plaintext) and output (ciphertext) are the same length; the output cannot be shorter than the input — this is logically required by the Pigeonhole principle and the fact that the cipher must be invertible — and it is simply undesirable for
..... Click the link for more information.
In cryptography, the key size (alternatively key length) is the size of the digits used to create an encrypted text; it is therefore also a measure of the number of possible keys which can be used in a cipher, and the number of keys which must be tested to 'break' the
..... Click the link for more information.
exclusive disjunction, also called exclusive or, (symbolized XOR or EOR), is a type of logical disjunction on two operands that results in a value of "true" if and only if exactly one of the operands has a value of "true.
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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 the relationship between the plaintext and the ciphertext — Shannon's property of confusion.
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Modular arithmetic (sometimes called modulo arithmetic, or clock arithmetic) is a system of arithmetic for integers, where numbers "wrap around" after they reach a certain value — the modulus.
..... Click the link for more information.
CIPHERUNICORN-A

General
NEC
2000

CIPHERUNICORN-E

CRYPTREC
Cipher detail
Key size(s):| 128, 192, or 256 bits

Block size(s):| 128 bits
nested Feistel network
16
In cryptography, CIPHERUNICORN-A
..... Click the link for more information.
key schedule is an algorithm that, given the key, calculates the subkeys for these rounds.

Some types of key schedules

  • Some ciphers have simple key schedules.

..... Click the link for more information.
Differential cryptanalysis is a general form of cryptanalysis applicable primarily to block ciphers, but also to stream ciphers and cryptographic hash functions. In the broadest sense, it is the study of how differences in an input can affect the resultant difference at the output.
..... Click the link for more information.
In cryptography, linear cryptanalysis is a general form of cryptanalysis based on finding affine approximations to the action of a cipher. Attacks have been developed for block ciphers and stream ciphers.
..... Click the link for more information.
Only public domain resources can be copied without permission—this does not include most web pages or images July 6 is the 1st day of the year (2nd in leap years) in the Gregorian calendar. There are 0 days remaining.
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Matthew J.B. "Matt" Robshaw is a cryptographer, currently a lecturer at Royal Holloway, University of London. His notable work includes the cryptanalysis of a number of cryptographic primitives, including the extension of linear cryptanalysis to use multiple approximations, and the
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David A. Wagner (1974) is an Associate Professor of Computer Science at the University of California, Berkeley and a well-known researcher in cryptography and computer security.
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block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. When encrypting, a block cipher might take a (for example) 128-bit block of plaintext as input, and output a corresponding 128-bit block
..... Click the link for more information.


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