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Simple form of encryption
A null cipher, also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material
Null_cipher
Disused cipher that was used historically
concealment, or null, cipher is any cipher which involves a number of nulls, or decoy letters. A null cipher could be plaintext words with nulls placed in designated
Classical_cipher
Steganography method
teleprinter communications during most of the 20th century. Null Cipher, a related cipher. Bacon, Francis (1605). The Proficience and Advancement of Learning
Bacon's_cipher
Choosing not to use encryption
In modern cryptography, null encryption (or selecting null cipher or NONE cipher) is choosing not to use encryption in a system where various encryption
Null_encryption
Method of encryption
exposed, such words would first be concealed by code. The cipher clerk may also add entire null words, which were often chosen to make the ciphertext humorous
Transposition_cipher
Cryptography algorithm
In cryptography, a block cipher mode of operation is an algorithm that uses a block cipher to provide information security such as confidentiality or
Block cipher mode of operation
Block_cipher_mode_of_operation
Cryptographic protocols for securing data in transit
obsolete features including compression, renegotiation, non-AEAD ciphers, null ciphers, non-PFS key exchange (among which are static RSA and static DH
Transport_Layer_Security
System to replace plaintext with ciphertext
In cryptography, a substitution cipher is a method of encrypting that creates the ciphertext (its output) by replacing units of the plaintext (its input)
Substitution_cipher
Polyalphabetic substitution encryption and decryption system
The Alberti cipher, created in 1467 by Italian architect Leon Battista Alberti, was one of the first polyalphabetic ciphers. In the opening pages of his
Alberti_cipher
Early block substitution cipher
The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution
Playfair_cipher
Simple type of polyalphabetic encryption system
The Vigenère cipher (French pronunciation: [viʒnɛːʁ]) is a method of encrypting alphabetic text where each letter of the plaintext is encoded with a different
Vigenère_cipher
Type of substitution cipher
pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) is a geometric
Pigpen_cipher
Simple and widely known encryption technique
A Caesar cipher is one of the simplest and most widely known encryption techniques used in cryptography. It is a type of substitution cipher in which
Caesar_cipher
Decryption of World War II cipher
Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications
Cryptanalysis_of_the_Enigma
German cipher machine during World War II
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication
Enigma_machine
Unbroken cipher
are nulls. Evidence for this is given by the author on p. 111 of the text under the sub-section heading Military Codes and Ciphers: "The cipher is of
D'Agapeyeff_cipher
Cipher machines used by the German Army during World War II
The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II. They were developed by C. Lorenz
Lorenz_cipher
List of humorous technical standards proposals
"Banned in the U.S.A."," Informational. TLS 1.3 (RFC 8446) eliminates null cipher suites entirely. However, one vestigial zero remains in the key schedule:
April Fools' Day Request for Comments
April_Fools'_Day_Request_for_Comments
Class of cipher
In the history of cryptography, a grille cipher was a technique for encrypting a plaintext by writing it onto a sheet of paper through a pierced sheet
Grille_(cryptography)
French cypher that remained unbroken for several centuries
The Great Cipher (French: Grand chiffre) was a nomenclator cipher developed by the Rossignols, several generations of whom served the French monarchs
Great_Cipher
Type of transposition cipher
The rail fence cipher (also called a zigzag cipher) is a classical type of transposition cipher. It derives its name from the manner in which encryption
Rail_fence_cipher
Multiple-substitution writing system cipher
polyalphabetic cipher is a substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though
Polyalphabetic_cipher
Type of code
used as a basic cipher called the Polybius cipher. This cipher is quite insecure by modern standards, as it is a substitution cipher with characters being
Polybius_square
Encryption technique
the principles of information theory. Digital versions of one-time pad ciphers have been used by nations for critical diplomatic and military communication
One-time_pad
List of versions of the Java programming language
based on the type of the argument, null cases and refining patterns Object o = ...; return switch (o) { case null -> "Null"; case String s -> "String %s"
Java_version_history
Substitution cipher based on linear algebra
Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which
Hill_cipher
Cryptographic cipher device
using digits. It also is known as a monôme-binôme cipher. In 1555, Pope Paul IV created the office of Cipher Secretary to the Pontiff. In the late 1580s, this
Straddling_checkerboard
Encryption tool used to perform a transposition cipher
cylinder", also σκύταλον skútalon) is a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchment wound around it on which
Scytale
suspicious cover text. This particular form of steganography is called a null cipher. Messages written in Morse code on yarn and then knitted into a piece
List of steganography techniques
List_of_steganography_techniques
Text formed from parts of another text
relationship between the key letters is less obvious. These are referred to as null ciphers in steganography, using the first letter of each word to form a hidden
Acrostic
Encryption and decryption method
A book cipher is a cipher in which each word or letter in the plaintext of a message is replaced by some code that locates it in another text, the key
Book_cipher
interchangeable, as is "null". Sporting terms are sometimes used as slang terms for zero, as are "nada", "zilch" and "zip". "Zero" and "cipher" are both names
Names for the number 0 in English
Names_for_the_number_0_in_English
Substitution cipher
(Hebrew: אתבש; also transliterated Atbaš) is a monoalphabetic substitution cipher originally used to encrypt the Hebrew alphabet. It can be modified for use
Atbash
Number
terms for 0 include zilch and zip. Historically, ought, aught (/ɔːt/), and cipher have also been used. The word zero came into the English language via French
0
Simple encryption method
substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. It is a special case of the Caesar cipher which was developed
ROT13
Cryptographic technique
describes the same concept and was thus included in the paper's references. Null cipher – Simple form of encryption Email spam – Unsolicited messages sent by
Chaffing_and_winnowing
Enciphered text written by English composer Edward Elgar
correct clear text, encoded once again as a simple substitution cipher (with two letters as nulls), although some details remain to be worked out. His solution
Dorabella_Cipher
Puzzle
text. Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand. Substitution ciphers where each letter is
Cryptogram
Type of cipher used in World War I
In cryptography, the ADFGVX cipher was a manually applied field cipher used by the Imperial German Army during World War I. It was used to transmit messages
ADFGVX_cipher
Cipher method
The Chaocipher is a cipher method invented by John Francis Byrne in 1918 and described in his 1953 autobiographical Silent Years. He believed Chaocipher
Chaocipher
Set of cryptographic protocols
"Pre-Shared Key (PSK) Ciphersuites with NULL Encryption for Transport Layer Security (TLS)". RFC 5487: "Pre-Shared Key Cipher Suites for TLS with SHA-256/384
TLS-PSK
Study of the frequency of letters or groups of letters in a ciphertext
letters in a ciphertext. The method is used as an aid to breaking classical ciphers. Frequency analysis is based on the fact that, in any given stretch of
Frequency_analysis
Fundamental tool in cryptography
ciphers, including the Vigenère cipher and Blaise de Vigenère's less well-known autokey cipher. All polyalphabetic ciphers based on the Caesar cipher
Tabula_recta
Cryptography in the Indian classic treatise Kamasutra
the names Kautilya and Muladeviya. The ciphers described in the Jayamangala commentary are substitution ciphers: in Kautiliyam the letter substitutions
Mlecchita_vikalpa
Musical algorithm for encrypting and decrypting information
meaningless null-symbol notes (e.g., the cipher melody is only in the tenor line or only the notes with stems pointing down). The cipher manuscript from
Music_cipher
How often identical letters appear in the same position in two texts
between the observed I.C. and the null value of 1.0. The number of cipher alphabets used in a polyalphabetic cipher may be estimated by dividing the expected
Index_of_coincidence
Fractionated cipher
trifid cipher is a classical cipher invented by Félix Delastelle and described in 1902. Extending the principles of Delastelle's earlier bifid cipher, it
Trifid_cipher
encryption MISTY1 Multiplex link encryption Net control station (NCS) Null cipher One-time pad Over the Air Rekeying (OTAR) Plaintext PPPoX Protected distribution
List of telecommunications encryption terms
List_of_telecommunications_encryption_terms
Methods to break a stream cipher
security measures require each station to send a continuous stream of cipher bits, with null characters (e.g. LTRS in Baudot) transmitted when there is no real
Stream_cipher_attacks
Adding data to a message prior to encryption to hide its length
report, Sincerely yours, etc. The primary use of padding with classical ciphers is to prevent the cryptanalyst from using that predictability to find known
Padding_(cryptography)
Symmetric encryption cipher
The four-square cipher is a manual symmetric encryption technique. It was invented by the French cryptographer Felix Delastelle. The technique encrypts
Four-square_cipher
Security profile for Real-time Transport Protocol
networks.) Besides the AES cipher, SRTP allows the ability to disable encryption outright, using the so-called null encryption cipher, which can be assumed
Secure Real-time Transport Protocol
Secure_Real-time_Transport_Protocol
Complex Soviet pencil and paper cipher
The VIC cipher was a pencil and paper cipher used by the Soviet spy Reino Häyhänen, codenamed "VICTOR". If the cipher were to be given a modern technical
VIC_cipher
Manually operated symmetric encryption cipher
In the history of cryptography, the Nihilist cipher is a manually operated symmetric encryption cipher, originally used by Russian Nihilists in the 1880s
Nihilist_cipher
Encryption technique
The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large
Two-square_cipher
Classic polyalphabet encryption system
An autokey cipher (also known as the autoclave cipher) is a cipher that incorporates the message (the plaintext) into the key. The key is generated from
Autokey_cipher
Cryptographic cipher
The Aristocrat Cipher is a type of monoalphabetic substitution cipher in which plaintext is replaced with ciphertext and encoded into assorted letters
Aristocrat_Cipher
Method in cryptanalysis
method) is a method of attacking polyalphabetic substitution ciphers, such as the Vigenère cipher. It was first published by Friedrich Kasiski in 1863, but
Kasiski_examination
Polyalphabetic encryption system
The Beaufort cipher, created by Sir Francis Beaufort, is a substitution cipher similar to the Vigenère cipher, with a slightly modified enciphering mechanism
Beaufort_cipher
British paper cryptographic system
contained on a set of vocabulary cards, and cipher sheets for superencryption of the numeric code words. The cipher sheets, which are typically changed daily
BATCO
Cryptographic algorithm
considered incriminating. Furthermore, analysis has revealed flaws in the cipher such that it is now considered insecure. This algorithm uses a standard
Solitaire_(cipher)
Rotor cipher machine
The Schlüsselgerät 41 ("Cipher Machine 41"), also known as the SG-41 or Hitler mill, was a rotor cipher machine, first produced in 1941 in Nazi Germany
Schlüsselgerät_41
Aspect of WWII Allied intelligence gathering
Cryptanalysis of the Lorenz cipher was the process that enabled the British to read high-level German army messages during World War II. The British Government
Cryptanalysis of the Lorenz cipher
Cryptanalysis_of_the_Lorenz_cipher
Encryption system
In classical cryptography, the bifid cipher is a cipher which combines the Polybius square with transposition, and uses fractionation to achieve diffusion
Bifid_cipher
Type of polyalphabetic substitution cipher
In classical cryptography, the running key cipher is a type of polyalphabetic substitution cipher in which a text, typically from a book, is used to provide
Running_key_cipher
Encoding for text messages
timing of the taps to isolate letters. To communicate the word "hello", the cipher would be the following (with the pause between each number in a pair being
Tap_code
cryptography include: A5/1 • A5/2 • ABA digital signature guidelines • ABC (stream cipher) • Abraham Sinkov • Acoustic cryptanalysis • Adaptive chosen-ciphertext
Index of cryptography articles
Index_of_cryptography_articles
Type of substitution cipher
The affine cipher is a type of monoalphabetic substitution cipher, where each letter in an alphabet is mapped to its numeric equivalent, encrypted using
Affine_cipher
Cryptographic system for numbers
cryptography Ciphers by family Polyalphabetic Alberti Beaufort Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square
Shackle_code
Method for writing secret messages
messages inside an ordinary letter so that the whole would not appear to be a cipher at all. Such a disguised message is considered to be an example of steganography
Cardan_grille
Private amusement embedded in a court judgement in the ''DaVinci Code''
Titanic Historical Society – among other things. The cipher was a type of polyalphabetic cipher known as a Variant Beaufort, using a keyword based on
Smithy_code
Manual codebreaking method
was for use in cryptanalysis of the Lorenz cipher produced by the SZ40 and SZ42 teleprinter rotor stream cipher machines, one of the Germans' Geheimschreiber
Turingery
Rasterschlüssel 44 (abbr. RS 44) was a manual cipher system, used by the German Wehrmacht during the Second World War. The cipher was designed by the astronomer and
Rasterschlüssel_44
Disk encryption software
(LUKS2) encryption keys to be stored along with encryption parameters such as cipher type and key size. The presence of this header is a major difference between
Linux_Unified_Key_Setup
German Naval World War II hand-cipher system
German Naval World War II hand-cipher system used as a backup method when no working Enigma machine was available. The cipher had two stages: a transposition
Reservehandverfahren
Implementations of Advanced Encryption Standard
usually with null bytes. This can be accomplished via several methods, the simplest of which assumes that the final byte of the cipher identifies the
AES_implementations
Cipher used by the UK in World War II
words a number. The numbers are then used as a key for a transposition cipher to conceal the plaintext of the message, often by double transposition.
Poem_code
Stack-based programming language
CHAR POSTPONE LITERAL ; IMMEDIATE In 1987, Ron Rivest developed the RC4 cipher-system for RSA Data Security, Inc. Its description follows: We have an array
Forth_(programming_language)
Password-based key derivation function
designed by Niels Provos and David Mazières. It is based on the Blowfish cipher and presented at USENIX in 1999. Besides incorporating a salt to protect
Bcrypt
British-Canadian codebreaker and mathematician (1917–2002)
made a fundamental advance in cryptanalysis of the Lorenz cipher, a major Nazi German cipher system which was used for top-secret communications within
W._T._Tutte
Block cipher
cryptography, SXAL (substitution xor algorithm, sometimes called SXAL8) is a block cipher designed in 1993 by Yokohama-based Laurel Intelligent Systems. It is normally
SXAL/MBAL
Feature of the TLS network security protocol
a1d9a449be814b89a0b52f470e2d... Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f) Compression Method: null (0) Extensions Length: 22 [other
Application-Layer Protocol Negotiation
Application-Layer_Protocol_Negotiation
Soviet cipher machine
In cryptography, Fialka (M-125) is the name of a Cold War-era Soviet cipher machine. A rotor machine, the device uses 10 rotors, each with 30 contacts
Fialka
Pioneering five-bit character encodings
to the positions where they have stayed ever since: the NULL or BLANK and the DEL code. NULL/BLANK was used as an idle code for when no messages were
Baudot_code
The Reihenschieber (English: Row Slider) was a hand cipher system used by the German Bundeswehr. It was developed during 1957 and used until the early
Reihenschieber
Revelation of secrets to unauthorized parties
cryptography Ciphers by family Polyalphabetic Alberti Beaufort Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square
Information_leakage
Concept in cryptanalysis
follow other symbols. The method is used as an aid to breaking classical ciphers. Contact analysis is based on the fact that, in any sample of any written
Contact_analysis
Cryptography standard
-connect example.org:443 -host example.org 2>/dev/null | openssl x509 > example.org.cer 2>/dev/null $ openssl crl2pkcs7 -nocrl -certfile example.org.cer
PKCS_7
Attack model in cryptanalysis
security, it would be very useful to be able to distinguish real messages from nulls. Even making an informed guess of the existence of real messages would facilitate
Ciphertext-only_attack
Secure network protocol suite
ESP DES-CBC Cipher Algorithm With Explicit IV RFC 2410: The NULL Encryption Algorithm and Its Use With IPsec RFC 2451: The ESP CBC-Mode Cipher Algorithms
IPsec
different from Coldman or Cipher. Emmerich is accused by Diamond Dogs of murdering Strangelove and facilitating the attack on MSF for Cipher in exchange for his
Characters of the Metal Gear series
Characters_of_the_Metal_Gear_series
Supreme military command and control office of Nazi Germany during World War II
day from regional or local centres. They also had a Geheimschreibstube or cipher room where plaintext messages could be encrypted on Lorenz SZ40/42 machines
Oberkommando_der_Wehrmacht
Radio station in Taiwan
a Chinese character. Chinese media reported that they may employ a book cipher, that is, a particular book is used as the key, the first two digits refer
Star Star Broadcasting Station
Star_Star_Broadcasting_Station
Paper based encryption system, used in the American civil war
cryptography Ciphers by family Polyalphabetic Alberti Beaufort Enigma Trithemius Vigenère Polybius square ADFGVX Bifid Nihilist Tap code Trifid VIC cipher Square
Slidex
Italian politician
with homophones and nulls. His cipher-breaking rules are applicable to dispatches with word divisions, without homophones, nulls or code words. He says
Cicco_Simonetta
Rotor key machine used in World War II
Allies for a long time. All parts of the German Wehrmacht used the rotor cipher machine to encrypt their secret messages. Enigma. However, different models
Enigma-M4
Family of cryptographic hash functions
resistance. For this we need another NP-complete variation of RSD: 2-regular null syndrome decoding. Definition of 2-RNSD: Given w {\displaystyle w} matrices
Fast_syndrome-based_hash
Mapping arbitrary data to fixed-size values
lossy compression, randomization functions, error-correcting codes, and ciphers. Although the concepts overlap to some extent, each one has its own uses
Hash_function
Southern Athabaskan language
alphabet. Messages could be encoded and decoded by using a simple substitution cipher where the ciphertext was the Navajo word. Type two code was informal and
Navajo_language
Message sent to a certificate authority to apply for a certificate
SEQUENCE 154:d=4 hl=2 l= 9 prim: OBJECT :rsaEncryption 165:d=4 hl=2 l= 0 prim: NULL 167:d=3 hl=4 l= 271 prim: BIT STRING 442:d=2 hl=2 l= 0 cons: cont [ 0 ] 444:d=1
Certificate_signing_request
NULL CIPHER
NULL CIPHER
NULL CIPHER
NULL CIPHER
NULL CIPHER
NULL CIPHER
NULL CIPHER
NULL CIPHER
NULL CIPHER