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Information about Libelle (cipher)

Libelle is a German cipher system, developed by the Federal Office for Information Security. The algorithm is not publicised, in an attempt to make cryptanalysis more difficult. Some experts think this security through obscurity is a bad approach, because public scrutiny of an algorithm would uncover potential weaknesses. In order to keep the algorithm secret, it is only distributed as a microchip named Pluto and not as a piece of software.

It is possible to have a secret cipher algorithm while still reaping the benefits of public cryptography research: one way is to make a non-weakening change to a public algorithm, like changing the Nothing up my sleeve numbers, or chaining the public cipher with an unrelated secret cipher. This is likely the case, as the unusual keylength of 168 bit heavily suggests 3DES as the core cipher.

See also

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
Anthem
"Das Lied der Deutschen" (third stanza)
also called "Einigkeit und Recht und Freiheit"
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The Bundesamt für Sicherheit in der Informationstechnik (abbreviated BSI - in English: Federal Office for Information Security) is the German government agency in charge of managing computer and communication security for the German government.
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In mathematics, computing, linguistics, and related disciplines, an algorithm is a finite list of well-defined instructions for accomplishing some task that, given an initial state, will proceed through a well-defined series of successive states, eventually terminating in an
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Cryptanalysis (from the Greek kryptós, "hidden", and analýein, "to loosen" or "to untie") is the study of methods for obtaining the meaning of encrypted information, without access to the secret information which is normally required to do so.
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In cryptography and computer security, security through obscurity (sometimes security by obscurity) is a controversial principle in security engineering, which attempts to use secrecy (of design, implementation, etc.) to provide security.
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In cryptography, nothing up my sleeve numbers are any numbers which, by their construction, are above suspicion of hidden properties. They are used in creating cryptographic functions such as hashes and ciphers.
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Skipjack

General
NSA
1998 (declassifed)

Cipher detail
Key size(s):| 80 bits

Block size(s):| 64 bits
unbalanced Feistel network
32
Best public cryptanalysis|-| colspan=2 | 31 rounds are susceptible to impossible differential cryptanalysis.
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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
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3-Way

General
Joan Daemen
1994

NOEKEON
BaseKing

Cipher detail
Key size(s):| 96 bits

Block size(s):| 96 bits
Substitution-permutation network
11
Best public cryptanalysis|-| colspan=2 | related-key attack

In cryptography,
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AES
The SubBytes step, one of four stages in a round of AES

General
Vincent Rijmen, Joan Daemen
1998

Square
Anubis, Grand Cru

AES winner, CRYPTREC, NESSIE
Cipher detail
Key size(s):| 128, 192 or 256 bits[1]
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Akelarre

General
G. Álvarez, D. de la Guía, F. Montoya, A. Peinado
1996

IDEA, RC5

Cipher detail
Key size(s):| 128 bits

Block size(s):| 128 bits
Substitution-permutation network
4
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Anubis

General
Vincent Rijmen and Paulo S. L. M. Barreto
2000

Rijndael

Cipher detail
Key size(s):| 128 to 320 bits in steps of 32 bits

Block size(s):| 128 bits
substitution-permutation network
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ARIA

General

2003

AES

South Korean standard
Cipher detail
Key size(s):| 128, 192, or 256 bits

Block size(s):| 128 bits
Substitution-permutation network
12, 14, or 16
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BaseKing

General
Joan Daemen
1994

NOEKEON
3-Way

Cipher detail
Key size(s):| 192 bits

Block size(s):| 192 bits
Substitution-permutation network
11
Best public cryptanalysis|-| colspan=2 | related-key attack, power analysis
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Blowfish
The round function (Feistel function) of Blowfish

General
Bruce Schneier
1993

Twofish

Cipher detail
Key size(s):| 32-448 bits in steps of 8 bits; default 128 bits

Block size(s):| 64 bits
Feistel network
16
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Cryptomeria cipher
The Feistel function of the Cryptomeria cipher algorithm.

General
4C Entity
2003

DES

CSS

Cipher detail
Key size(s):| 56 bits

Block size(s):| 64 bits
Feistel network
10

The
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Camellia

General
Mitsubishi, NTT
2000

E2, MISTY1

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

Block size(s):| 128 bits
Feistel network
18 or 24

In cryptography, Camellia
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CAST-128
Three rounds of the CAST-128 block cipher

General
Carlisle Adams and Stafford Tavares
1996

CAST-256

Cipher detail
Key size(s):| 40 to 128 bits

Block size(s):| 64 bits
Feistel network
12 or 16
In cryptography,
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CAST-256

General
Carlisle Adams, Stafford Tavares, Howard Heys, Michael Wiener
1998

CAST-128

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

Block size(s):| 128 bits
generalised Feistel network
48
In cryptography, CAST-256
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CIKS-1

General
A.A. Moldovyan and N.A. Moldovyan
January 2002

Spectr-H64

Cipher detail
Key size(s):| 256 bits

Block size(s):| 64 bits
Feistel-like network
8
Best public cryptanalysis|-| colspan=2 | Differential attack using 2
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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
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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.
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CMEA

General
James A. Reeds III
1991

Cipher detail
Key size(s):| 64 bits

Block size(s):| 16-64 bits

3
Best public cryptanalysis|-| colspan=2 | 338 chosen plaintexts break all block sizes, 40-80 known plaintexts break 24-bit blocks, and 4
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In cryptography, Cobra is the general name of a family of data-dependent permutation based block ciphers: Cobra-S128, Cobra-F64a, Cobra-F64b, Cobra-H64, and Cobra-H128. In each of these names, the number indicates the cipher's block size, and the capital letter indicates whether it
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COCONUT98

General
Serge Vaudenay
1998

DFC

Cipher detail
Key size(s):| 256 bits

Block size(s):| 64 bits
Decorrelated Feistel cipher
8
Best public cryptanalysis|-| colspan=2 | Wagner's boomerang attack uses about 216
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Crab

General
Burt Kaliski, Matt Robshaw
1993

MD5

SHACAL

Cipher detail
Key size(s):| 80 bits

Block size(s):| 8192 bits
Cryptographic hash function
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CRYPTON

General
Chae Hoon Lim
1998

Square

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

Block size(s):| 128 bits
Substitution-permutation network
12

In cryptography, CRYPTON
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CS-Cipher

General
Jacques Stern and Serge Vaudenay
1998

Cipher detail
Key size(s):| 128 bits

Block size(s):| 64 bits
Feistel network
8

In cryptography, CS-Cipher (for Chiffrement Symétrique
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Deal can refer to:
  • while playing card games, the act of distributing the cards from the deck to the players of the game
  • Deal$, an American dollar store chain
  • Deal (film), a 2007 film about poker.

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Data Encryption Standard
The Feistel function (F function) of DES

General
IBM
1975 (standardized on January 1977)

Lucifer
Triple DES, G-DES, DES-X, LOKI89, ICE

Cipher detail
Key size(s):| 56 bits

Block size(s):| 64 bits
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