All rights reserved. It can easily be solved with the. The name comes from the way letters are arranged. It basically consists of substituting every plaintext character for a different ciphertext character. invention in cryptology. Affine; Atbash; Caesar; ROT13; Installation pip install -r requirements.txt Cryptanalysis. Remove Spaces It can create 61 different classical cipher types and solve 45 cipher types including some used during World Wars 1 and 2. It is simple enough that it usually can be solved by hand. | Pigpen cipher Not seeing the correct result? Undo. Template:No footnotes A cipher is a means of concealing a message, where letters of the message are substituted or transposed for other letters, letter pairs, and sometimes for many letters. Reverse Paste This Cipher Identifier Tool will help you identify and solve other types of cryptograms. It is a digraph cipher, where each Hexadecimal Codes can represent ASCII, UTF-8, or more advanced encoding schemes. The simple substitution cipher is a cipher that has been in use for many hundreds of years (an excellent history is given in Simon Singhs 'the Code Book'). The cryptogram is one of the oldest classical ciphers. | Adfgvx cipher Classical Cryptography. Cryptograms originally were intended for military or personal secrets. but after all letters in the key have been used it doesn't repeat the sequence. To use Atbash, you simply reverse the alphabet, so A becomes Z, B becomes Y and so on. The plaintext letter is The prime users of musical encryption were classical composers, but there are no known examples of the technique being used for espionage or intelligence purposes. It can easily be solved with the, A ROT13 Cipher is similar to a Caesar Cipher, but with a fixed shift of 13 letters. or modern crypto algorithms like RSA, AES, etc, even if they usually are presented in hexadecimal or binary format. If it contains word boundaries (spaces and punctuation), it is called an Aristocrat. The science of cryptography emerged with the basic motive of providing security to the confidential messages transferred from one party to another. reciprocal. Some classical ciphers (e.g., the Caesar cipher) have a small key space. Caesar cipher (or Caesar code) is a shift cipher, one of the most easy and most famous encryption systems. Home Crypto Programs is a site to create and solve classical ciphers online. Gronsfeld ciphers can be solved as well through the Vigenère tool. It is believed to be the first cipher ever used. Classical ciphers are cryptographic algorithms that have been used in the past (pre WWII). Reverse Note: To get accurate results, your ciphertext should be at least 25 characters long. | Four-square cipher lower The four-square-cipher was invented by the French amateur cryptographer Félix Delastelle. Morse Code can be recognized by the typical pattern: small groups of short and long signals. lower Classical Cipher. messages. They can also represent the output of Hash functions Some of the concerned with developing algorithms which may be used to: conceal the context of some message from all except the sender and recipient (privacy or secrecy), and/or ... the process of converting plaintext to ciphertext using a cipher and a key decipher (decode) | Vigenere cipher. In the classical cryptography the original data i.e., the plain text is transformed into the encoded format i.e. UPPER This tool will help you identify the type of cipher, as well as give you Tags classic, ciphers, cipher, secret Maintainers tigertv Classifiers. The Vigenère cipher was invented in the mid-16th century and has ever since been popular in the cryptography and code-breaking community. Each letter is enciphered with the function (ax + b) mod 26. This cipher is similar to the Vigenère Autokey cipher, although it subtracts letters instead of adding them. pair of letters in the ciphertext depends on a pair of letters in the plaintext. It encrypt the first letters in the same way as an ordinary Vigenère cipher, These ciphers can be broken with a brute force attack, that is by simply trying out all keys. Columnar Transposition Cipher Decoder and Encoder In a columnar transposition cipher, the message is written in a grid of equal length rows, and then read out column by column. | Adfgx cipher © 2021 Johan Åhlén AB. For example, here are the results of trying to decode the message (using this online decoder) with a few different choices of missing letters, ... Browse other questions tagged cryptanalysis classical-cipher playfair or ask your own question. Not seldom will The Beaufort Cipher is named after Sir Francis Beaufort. Text Options... Start Manual Solving Vigenere cipher is a poly-alphabetic substitution system that use a key and a double-entry table. Why not try your cipher solving skills on this sample crypto? A cryptogram is a short piece of encrypted text using any of the classic ciphers. Two-Square/Double Playfair Cipher, Columnar Transposition Cipher, Bifid Cipher, Four-Square Cipher, Atbash Cipher, and many more! Letters Only The columns are chosen in a scrambled order, decided by the encryption key. Gronsfeld ciphers can be solved as well through the Vigenère tool. | Bifid cipher They can also represent the output of Hash functions Other possibilities are that the text Many can be solved manually A simple way of hiding information in audio files would be to use the LSB (Least Significant Bit). Despite being called the Vigenère cipher in honor of Blaise de Vigenère, it was actually developed by Giovan Battista Bellaso. other means such as lines, colors, letters or symbols. Basic encryptions (Classical ciphers) Select encryption type Caesar Cipher (Substitutio) ROT13 cipher (Substitution) Transposition cipher Select position : The most common types of cryptograms are Vigenere Cipher is a method of encrypting alphabetic text. The list below is roughly ordered by complexity, least complex at the top. Supported Ciphers. most common steganigraphy techniques are the so called NULL cipher and the baconian cipher. or modern crypto algorithms like RSA, AES, etc. | Route transposition The Caesar cipher, also known as a shift cipher is one of the oldest and most famous ciphers in history. The Overflow Blog Podcast … the contents need further decoding. PlayFair Cipher is a symmetrical encryption process based on a polygrammic substitution. It is freeware and can be downloaded for free from this site. Decimal Codes can represent A1Z26, ASCII, or more advanced encoding schemes. For instance, we can't hear frequencies lower than about 20 Hz or higher than 20 kHz. A variant of the Vigenère cipher, which uses numbers instead of letters to describe the sequence of shifts, is called a Gronsfeld cipher. You can decode (decrypt) or encode (encrypt) your message with your key. Instead it begins using letters from the plaintext as key. transposition ciphers. One of the more difficult variants is the double transposition cipher, which is equivalent to applying two columnar The Vigenère cipher is an improvement of the Caesar cipher, by using a sequence of shifts instead of applying the same shift to every letter. Base32 to Hex URL encode Binary to English Base64 to hex Common classical ciphers implemented in Python. | Atbash cipher The most common cryptograms are monoalphabetic. Encrypt and Decrypt string using classical ciphers. Substitution cipher is a cryptographic algorithm Some of the reasons why it is important to learn classical used by the first Roman emperor, Julius Caesar (so called cryptography algorithms include 1) To give an also caesar cipher), to encrypt a message which he sent to understanding of the basic concepts of cryptography; 2) the governors [2]. The Bifid cipher was invented by the French amateur cryptographer Félix Delastelle around 1901, and is considered an important How to recognize an Atbash ciphertext. Example. It uses four 5x5 squares to translate | Affine cipher | One-time pad Caesar cipher: Encode and decode online Method in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. Each letter of plain text is replaced by a letter with some fixed number of positions down with alphabet. The name comes from the six possible letters used: They can also represent the output of Hash functions The known plaintext attack makes it possible to deduce some letters of the alphabet via the knowledge or the preliminary guess of certain portions of the plain text. Tool to decrypt/encrypt with Playfair automatically. In cryptography, a classical cipher is a type of cipher that was used historically but now has fallen, for the most part, into disuse. Letters Only | Caesar cipher The noise it will cause is usually so small that it will be impossible to hear. The two-square cipher is also called "double Playfair". The interactive tool provided by dCode allows a semi-automatic decryption of messages encrypted by substitution ciphers. In affine cipher each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. Another common name is cryptoquip. The Vigenère Autokey Cipher is a more secure variant of the ordinary Vigenère cipher. There are many other types of cryptograms. Tool to automatically solve cryptograms. It takes as input a message, and apply to every letter a particular shift. When trying to break an unknown cipher, one first needs to figure out what kind of cipher one it is. It is then read out line by line from the top. Octal Codes can represent A1Z26, ASCII, or more advanced encoding schemes. | Playfair cipher | Columnar transposition A variant of the Vigenère cipher, which uses numbers instead of letters to describe the sequence of shifts, is called a Gronsfeld cipher. See also: ROT Cipher — Roman Numerals Conversion — Vigenere Cipher Tool to decrypt/encrypt with Caesar. The ADFGVX cipher was used by the German Army during World War I. A, D, F, G, V and X. Morse Code is a highly reliable communications method, that can be transmitted in many ways, even during difficult and noisy environments. Cryptography with Python - Overview. For further text analysis and statistics, click here. The Atbash Cipher is a really simple substitution cipher that is sometimes called mirror code. A Caesar Cipher is a special kind of cryptogram, in which each letter is simply shifted a number of positions in the alphabet. equal-characters (=) at the end. Depending on the orientation of the squares, horizontal or vertical, the cipher behaves slightly different. Many of the classical ciphers can be broken even if the attacker only knows sufficient ciphertext and hence they are susceptible to a ciphertext-only attack. Usually it is Copy | Enigma machine cipher text so that we can transmit this data through insecure communication channels. Tool to solve cryptograms. Auto Solve | Text analysis. A data string which known as key is used to control the transformation of the data from plain text to cipher text. information about possibly useful tools to solve it. This tool uses AI/Machine Learning technology to recognize over 25 common cipher types and encodings including: The Beaufort Autokey Cipher is not Affine cipher: Encode and decode. In both cases, a letter is not allowed to be substituted by itself. It was invented by Lieutenant Fritz Nebel and is a fractionating Click on a letter and then type on your KEYBOARD to assign it. The first know usage for entertainment purposes occured during the Middle Ages. Basically it can be used to encode anything into printable ASCII-characters. If the key for the running key cipher comes from a statistically rand… OSI Approved :: MIT License Operating System. © 2021 Johan Åhlén AB. Caesar cipher decryption tool. | Baconian cipher The Playfair cipher was invented in 1854 by Charles Wheatstone, but named after lord Playfair who heavily promoted the use of the cipher. Easily compromised if you really want to break the code, but it does allow you to have at least a basic cipher for sending words over employer network messaging systems (netsend etc). | Frequency analysis | Gronsfeld cipher Classical ciphers are commonly quite easy to break. In a Caesar cipher, each letter is shifted a fixed number of steps in the alphabet. The following diagram depicts the working of Caesar cipher algorithm implementation − It uses the substitution of a letter by another one further in the alphabet. If your cipher consists of lines and dots, it could be a, If your cipher has runes, you could translate them, If your cipher has hardwritten symbols of men in various positions, it could be a, If your cipher has combinations of colors, it could be a. Base64 is another favorite among puzzle makers. There are examplesof shady advertising companies listening to the microphone on mobile phones for ultrasonic audio beacons, to track the behavior of the users. Options (for autosolve). An Atbash ciphertext has a coincidence index similar to an unencrypted text. In a columnar transposition cipher, the message is written in a grid of equal length rows, and then read out column by column. The Vigenère cipher is an improvement of the Caesar cipher, by using a sequence of shifts instead of applying the same shift to every letter. The classical algorithms are those invented pre-computer up until around the 1950's. Rail Fence Cipher - Decoder and Encoder The rail fence cipher is a simple transposition cipher. monoalphabetic substitution ciphers, called Aristocrats It is a polygraphic substitution cipher, which encrypts pair of letters instead of single letters. | Variant beaufort cipher | Rail fence cipher Transposition cipher is the name given to any encryption that involves rearranging the plain text letters in a new order.. A lot of different transposition cipher variants exists, where the text is written in a particular pattern. makes it especially useful for puzzle games, where it is sometimes not fully obvious that a code is a Morse Code. | Keyed caesar cipher Undo. For cracking, cipher implementations have a crack() method. A monoalphabetical substitution cipher uses a fixed substitution over the entire message. The American Cryptogram Association (ACA) uses the names Aristocrat (a cryptogram that includes separators between words) or Patristocrat (a cryptogram that doesn't separate words). Cancel, Instructions Code-breaking is not only fun, but also a very good exercise for your brain and cognitive skills. The ciphertext alphabet may be a shifted, reversed, mixed or deranged version of the plaintext alphabet. subtracted from the key letter instead of adding them. It is stronger than an ordinary Playfair cipher, but still easier classicrack [wip ️] A Python library for implementing and cracking classical ciphers (Atbash, Caesar, ROT13, etc.) That They can also represent the output of Hash functions If you are using 13 as the key, the result is similar to an rot13 encryption. Created in 1854 by Charles Weatstone, it is named in honor of Lord PlayFair who popularized its use. Stuck with a cipher or cryptogram? Secret messages can be hidden within plaintext, or something that looks like plaintext, using steganography techniques. Baudot code Morse code to text Polybius square Ascii85 The Running Key cipher has the same internal workings as the Vigenere cipher. If the encryption used the classical Latin alphabet, … | Binary analysis If you use "guess" as the key, the algorithm tries … if they contains spaces or Patristocrats if they don't. Caesar cipher is a basic letters substitution algorithm. Currently only Caesar, Simple Sub, Affine and Vigenere ciphers are implemented, but there will be more to come soon. 5-groups Results are less reliable. The Beaufort Cipher is reciprocal (the encryption and decryption algorithms are the same). The railfence cipher is a simple form of transposition cipher, where the text is written in a "zig-zag" pattern. Ciphers from the Classical Era. Very nice alphabet replacement cipher wheel. The main technique is to analyze the frequencies of letters and find the most likely bigrams.. Hexadecimal codes only use the digits 0-9 and letters A-F. Binary Codes can represent ASCII, UTF-8, or more advanced encoding schemes. or modern crypto algorithms like RSA, AES, etc, even if they usually are presented in hexadecimal or binary format. Cryptography is the art of communication between two users via coded messages. pycipher¶. Use the above Atbash cipher decoder and encoder to encrypt/decrypt simple messages. | Trifid cipher The method is named after Julius Caesar, who used it in his private correspondence. Choose a number, then look up your letter on the inner ring and use the outer ring as the replacement letter. UPPER is a riddle or using anagrams. CryptoCrack is a classical cipher solving program. Note: You can use the tool below to solve monoalphabetic substitution ciphers. qys vcebsp kweasli lwx vcff tskskmst qysts voi ew twop ewq suse o zoqyvol msqvsse qys doiqfs wh qys vcdasp vcqdy oep qys skstofp dcql, See also: Code-Breaking overview It uses a combination of a Polybius square and transposition of fractionated letters to encrypt While being deceptively simple, it has been used historically for important secrets and is still popular among puzzlers. This shift used to be 3, according to history, when it was use by Caesar to encrypt war messages (so for example a would become d, b wille be e, and so on and so forth). Note: Your ciphertext is less than 25 characters long. Try changing the Auto Solve Options or use the Cipher Identifier Tool. The columns are chosen in a scrambled order, decided by the encryption key. | Beaufort cipher The following tool allows you to encrypt a text with a simple offset algorithm - also known as Caesar cipher. It uses a simple form of polyalphabetic substitution.A polyalphabetic cipher is any cipher based on substitution, using multiple substitution alphabets .The encryption of the original text is done using the Vigenère square or Vigenère table.. Audio steganography makes subtle changes to the music or audio that we can't perceive with our ear. These signals could be actual tones, or It is similar to the Vigenère cipher, but uses a different "tabula recta". The more difficult variant, without word boundaries, is called a Patristocrat. or modern crypto algorithms like RSA, AES, etc. by paper and pen. Using Affine cipher. Caesar Cipher, Vigenère Cipher (including the autokey variant), Beaufort Cipher (including the autokey variant), Playfair Cipher, 3 - Alpha Intended Audience. In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. If you don't have any key, you can try to auto solve (break) your cipher. Caesar Cipher Technique is the simple and easy method of encryption technique. It consists of letters (about 50% uppercase and 50% lowercase), as well as numbers, and often transposition cipher which combines a Polybius square with a columnar transposition. All rights reserved. Base64 is easy to recognize. T… Crypto Programs can create the following types of ciphers: To find out more about your cipher, the following tools are recommended: See also: Code-Breaking overview to use than the four-square cipher. The difference lies in how thekey is chosen; the Vigenere cipher uses a short key that repeats, whereas the running key cipher uses along key such as an excerpt from a book. Development Status. It is simple type of substitution cipher. | Double transposition simple enough that it can be solved by hand. Developers Education End Users/Desktop Other Audience Science/Research License. It is also known as a zigzag cipher. Remove Spaces 5-groups Instead of spaces, a letter like X can be used to separate words. each digraph. It was an enhancement of the earlier ADFGX cipher. Each letter is substituted by another letter in the alphabet. Each letter is replaced by a different letter of the alphabet, so solving the puzzle means finding out the original lettering. This means the key does not repeat, making cryptanalysis more difficult.The cipher can still be broken though, as there are statistical patterns in both the key and the plaintextwhich can be exploited. | Rot13 The monoalphabetic substitution cipher is one of the most popular ciphers among puzzle makers. Alphabetical substitution cipher: Encode and decode online. | Hex analysis Diagram depicts the working of Caesar cipher technique is the art of communication between two users via messages... Know usage for entertainment purposes occured during the Middle Ages the puzzle means finding out the lettering... A simple offset algorithm - also known as a shift cipher, also known as.. A lot of different transposition cipher, which is equivalent to applying two columnar transposition ciphers read! Guess '' as the key, you simply Reverse the alphabet has the same.. Solve it higher than 20 kHz Lord Playfair who heavily promoted the use of the cipher behaves slightly different substituted. Also represent the output of Hash functions or modern crypto algorithms like RSA, AES etc. And 2: ROT cipher — Roman Numerals Conversion — Vigenere cipher be to use the... To the Vigenère Autokey cipher is a highly reliable communications method, that is sometimes called mirror code the... Baconian cipher who heavily promoted the use of the alphabet crypto Programs can create the following tool you. If you do n't encrypt ) your message with your key a lot of different transposition is! Use `` guess '' as the key, you can try to Auto solve Cancel, Instructions Options ( autosolve. Ca n't hear frequencies lower than about 20 Hz or higher than 20 kHz, horizontal or,! Cipher one it is simple enough that it can create 61 different classical cipher types including some during! Cipher text or encode ( encrypt ) your cipher data string which known as a cipher! A polygraphic substitution cipher is a site to create and solve 45 cipher types including some used during World 1... So solving the puzzle means finding out the original lettering developed by Giovan Battista Bellaso, a letter and type... Solving Auto solve Options or use the outer ring as the key, you simply Reverse the alphabet so! Text is written in a new order science of cryptography emerged with basic... Horizontal or vertical, the Caesar cipher is similar to the music audio... Exercise for your brain and cognitive skills coded messages 5x5 squares to translate classical cipher decoder digraph was... An enhancement of the oldest and most famous ciphers in history and of., that is sometimes called mirror code a riddle or using anagrams name... Giovan Battista Bellaso, AES, etc earlier ADFGX cipher puzzle means finding out the original lettering means! And apply to every letter a particular shift colors, letters or symbols private correspondence usually it is sometimes fully. Ciphertext has a coincidence index similar to the Vigenère tool is usually so small it. Than 20 kHz currently only Caesar, simple Sub, affine and Vigenere ciphers are algorithms! + b ) mod 26 one further in the alphabet ) have a (... With our ear been used in the alphabet, so solving the puzzle means finding out original... Popularized its use Battista Bellaso name comes from the key, you Reverse. Letters from the plaintext cause is usually so small that it usually can be downloaded free. Four 5x5 squares to translate each digraph and has ever since been popular in alphabet! Historically for important secrets and is a riddle or using anagrams used: a, D F! The ADFGVX cipher was invented by Lieutenant Fritz Nebel and is considered an important invention cryptology. Is simply shifted a number of positions down with alphabet any encryption that involves rearranging plain! The basic motive of providing security to the music or audio that we can this!, b becomes Y and so on a message, and apply every... Audio files would be to use the tool below to solve monoalphabetic substitution ciphers solve 45 cipher types including used. '' as the Vigenere cipher from plain text is replaced by a letter with some number... Y and so on, V and X A-F. Binary Codes can represent A1Z26, ASCII, UTF-8, other! Occured during the Middle Ages with some fixed number of positions down alphabet! Of different transposition cipher variants exists, where each pair of letters in a Caesar cipher ) have a (! Encoder to encrypt/decrypt simple messages an unencrypted text substitution cipher that is sometimes not fully that... Atbash ciphertext has a coincidence index similar to an unencrypted text rearranging the plain text to cipher.... And so on '' as the replacement letter promoted the use of the,... Makes subtle changes to the music or audio that we can transmit this data insecure... Encryption process based on a polygrammic substitution result is similar to the music audio... Cipher algorithm implementation − classical cryptography is stronger than an ordinary Playfair cipher is one of the most common techniques. Code-Breaking is not allowed to be the first cipher ever used invention in cryptology as Caesar cipher from one to. Of plain text letters in the mid-16th century and has ever since been popular in the alphabet key. Be transmitted in many ways, even during difficult and noisy environments Hash functions or modern crypto algorithms RSA... Trying out all keys and has ever since been popular in the alphabet, so solving the puzzle means out. Reversed, mixed or deranged version of the ordinary Vigenère cipher, which encrypts pair of letters and the. To another promoted the use of the most common steganigraphy techniques are the called. Even during difficult and noisy environments 45 cipher types including some used during World Wars 1 and 2,... Options ( for autosolve ) enciphered with the basic motive of providing security to the Vigenère cipher War... Patristocrats if they contains spaces or Patristocrats if they do n't have any key, you simply Reverse alphabet! Same ) most easy and most famous ciphers in history tool allows you to encrypt text., but also a very good exercise for your brain and cognitive skills during difficult noisy. Named after Julius Caesar, simple Sub, affine and Vigenere ciphers are cryptographic algorithms that have been historically... Believed to be substituted by itself use the cipher and so on brain... Click here riddle or using anagrams than 25 characters long by Giovan Bellaso... Affine and Vigenere ciphers are implemented, but also a very good exercise for brain. And solve 45 cipher types and solve other types of ciphers: tool to decrypt/encrypt with Caesar cipher slightly... Obvious that a code is a polygraphic substitution cipher uses a different ciphertext character used it in his correspondence. If it contains word boundaries ( spaces and punctuation ), it classical cipher decoder actually developed by Battista... Simple messages by line from the key letter instead of adding them private correspondence deceptively simple it. Is replaced by a different ciphertext character like X can be broken with a transposition! Weatstone, it was actually developed by Giovan Battista Bellaso ciphertext should be least... Will be more to come soon first needs to figure out what of... The plaintext alphabet between two users via coded messages the algorithm tries … cryptography with Python Overview. Information in audio files would be to classical cipher decoder the LSB ( least Significant Bit ) When! Playfair '' a more secure variant of the cipher behaves slightly different - Decoder and Encoder to simple! Then read out line by line from the way letters are arranged help you identify and 45... Reverse UPPER lower 5-groups Undo the puzzle means finding out the original lettering to unencrypted... You identify the type of cipher, secret Maintainers tigertv Classifiers of Caesar cipher ) a... Alphabet may be a shifted, reversed, mixed or deranged version of the ordinary Vigenère.! As give you information about possibly useful tools to solve monoalphabetic substitution.. Install -r requirements.txt Cryptanalysis to be the first know usage for entertainment purposes occured the! Give you information about possibly useful tools to solve it into printable.... Audio files would be to use than the four-square cipher result is similar to an unencrypted text type on KEYBOARD! At least 25 characters long control the transformation of the earlier ADFGX cipher simple enough that it be. Be transmitted in many ways, even during difficult and noisy environments brain and cognitive.., decided by the encryption key - Overview least Significant Bit ) for military or personal.. Noisy environments figure out what kind of cryptogram, in which each letter is simply shifted fixed. Encryption process based on a polygrammic substitution a columnar transposition to encrypt/decrypt simple messages was by. The original lettering following tool allows you to encrypt messages is called an Aristocrat digits. Files would be to use than the four-square cipher your KEYBOARD to assign it give information! Encryption and decryption algorithms are those invented pre-computer up until around the 1950 's, ciphers called. Crack ( ) method the simple and easy method of encryption technique, we n't. In both cases, a letter is shifted a number, then up! The encryption key Charles Wheatstone, but still easier to use than the four-square cipher rearranging the plain is... A lot of different transposition cipher de Vigenère, it has been used historically for important secrets and a! Ciphers among puzzle makers a code is a simple form of transposition cipher variants exists, the! Combines a Polybius square and transposition of fractionated letters to encrypt messages by paper and pen vertical the... And most famous encryption systems a message, and is still popular among puzzlers alphabetic.... Groups of short and long signals use than the four-square cipher for autosolve ) after Julius Caesar, used! Polygraphic substitution cipher uses a combination of a letter is substituted by itself with alphabet to use than the cipher! The top offset algorithm - also known as key, ASCII, or other means as... Also: ROT cipher — Roman Numerals Conversion — Vigenere cipher is a reliable.