4d); when I hit the edge of the paper I just follow the edge). In a Caesar cipher, each letter of the alphabet is shifted along some number of places. A tabula recta involves more manual work than users will actually want to use in practice. Here, we can see Cipherface mapping out the encrypted message using this method. We can see a clear relationship between the top two, with the same peaks just in different places. The person sending the message chooses a keyword and repeats it until it matches the length of the plaintext, for example, the keyword “LEMON”: LEMONLEMONLE You can work backwards using the tabula recta. The processes of both encipherement and decipherement involve the use of a table of letters, variously know as a Vigenère Square, Vigenère Table of Tabula Recta, which looks like this. Continuing in this way we get the final ciphertext "BSBF XDXEYA FITW". To solve the first two passages, codebreakers used vigenere, which is what cryptologists call a polyalphabetic substitution cipher system. In 1854 Charles Babbage cracked the Vigenère Cipher, but his work was not published in his lifetime. The algorithm used here is the same as that used by the American Cryptogram Association. RC4 has biases in the initial keystream. The resulting kitchen tabula rasa will make you feel cleansed. Nothing ensures better password security than this centuries-old cipher technique. I've been wanting to learn Haskell and decided to take on building the same program but in Haskell. … Data is encrypted by switching each letter of the message with the … Once all of the key characters have been written, start writing the plaintext as the key: Now we take the letter we will be encoding, 'D', and find it on the first column on the tableau. Graham-Cumming generates his password using a program he wrote which "chooses random characters (using a cryptographically secure random number generator) and then prints them out on a tabula recta.". I'm specifically interested in this statement: you could just have a table of all 100 The rebuilding of Singapore becomes an emblem of cultural tabula rasa and bigness. The Tabula Recta (sometimes called a 'Vigenere Table'), was created by Johannes Trithemius, and has been used in several ciphers, including all variants of Bellaso's Vigenere cipher and the Trithemius cipher. Repeat the keyword as needed: It was this thought that earned it the nickname "le chiffre indéchiffrable" (French for "the unbreakable cipher"). How Long Would it Take to Crack Your Password? 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.. Another source is Helen Fouche Gaines book "Cryptanalysis". Where these two lines cross in the table is the ciphertext letter you use. Here's how it works, via Wikipedia: " Using a tabula recta, each alphabet is shifted one letter to the left from the one above it. Using the tabula recta, find the row that corresponds to the first letter in your secret key text- in our case, B. The method used to break it is called the, Combining Monoalphabetic and Simple Transposition Ciphers. The Voynich Code - The Worlds Most Mysterious Manuscript - The Secrets of Nature - Duration: 50:21. this is all i have so far. You do not provide a good way for users to rotate passwords other than picking a … The vertical column where that cipher text letter is located reveals the plaintext letter I. with the keyword, "pickle". The Kasiski examination can be used to attack polyalphabetic substitution ciphers such as the Vigenère cipher, revealing the keyword that was used to encrypt the message. Although this is not true (it was fully broken by. The keystream is made by starting with the keyword or keyphrase, and then appending to the end of this the plaintext itself. And even though there is a little bit of a peak at "G" (which we might think to be "e"), in the penultimate word "new" is "GIJ", so "G" is "n", but in the first word "aged" is "ETGU" so "G" is "e". It looks like this: ", Lifehacker interviews John Graham-Cumming, a programmer and mathematician with a doctorate in computer security, on this particular method of password security. Then, we move along the 'D' row of the tableau until we come to the column with the 'F' at the top (The 'F' is t… The Vigenère square or Vigenère table, also known as the tabula recta, can be used for encryption and decryption. tabula recta (GC4KVFE) was created by AKBurque on 8/25/2013. As an example we shall decipher the ciphertext "ZPSPNOXMOFAORMQDPUKZ" which has been encoded using the keyword. Where the Vigenere cipher is a polyalphabetic cipher with 26 alphabets, the Porta is basically the same except it only uses 13 alphabets. The Frequency distribution of the plaintext. The term was invented by the German author and monk Johannes Trithemius in 1508, and used in his Trithemius cipher . This is called the keystream. 'The wife starts out tabula rasa, she listens to the lawyer. Tag: tabula recta Posted in Science & Nature Cryptography: Kasiski Examination. This forms 26 rows of shifted alphabets, ending with Z. In cryptography, the tabula recta (from Latin tabula rēcta) is a square table of alphabets, each row of which is made by shifting the previous one to the left. The keystream using the keyword battista. The 13 cipher alphabets it uses are reciprocal, so enciphering is the same as deciphering. But why is the Vigenère Cipher so secure? The entire wiki with photo and video galleries for each article My passwords are generated using a little program I wrote that chooses random characters (using a cryptographically secure random number generator) and then printing them out on a tabula recta. Now for each plaintext letter, you find the … Friedrich Kasiski in 1863), it is still a very secure cipher in terms of paper and pen methods, and is usable as a field cipher. CREEPTOLOGY : Xinyu, Qining, Shuyi, Jacelyn. The next letter is switched by using the second shifted alphabet, and this continues until you have encrypted the entire message. Here we have the beginings of a program that takes in a message from a user and encrypts it using a version of the Vigenere Cipher called "Tabula Recta." Although more difficult, it is not impossible to break the Vigenère Cipher (despite its nickname). I came across this link, describing a way to use a physical token (a tabula recta with randomly generated characters) to derive different passwords for different sites (choose a cell using the site name and some rule, follow another rule to get the chars that compose your password). No? Inspired by the Lifehacker article of “How to Write Down and Encrypt Your Passwords with an Old-School Tabula Recta” I have thrown together my own web-based Tabula Recta generator. Now we must use the tabula recta and the information in the table above. Say I want to encode, "my spoon is too big." In this post, a couple comments suggested that a tabula recta could be used to perform Shamir Secret Sharing. What is it that makes this cipher better than the. Here's how it works, via Wikipedia: "Using a tabula recta, each alphabet is shifted one letter to the left from the one above it. For an example, see the " tabula rasa" hierarchy in the next section. Vigenere Cipher is a method of encrypting alphabetic text. This shows that the same letter can be achieved by different plaintext letters. This is a just a quick proof of concept. These frequency distributions show how many times each letter appears in the relevent text. For the letter, "m", I would look at the tabula recta and find, "m", then look right, to the letter, "p", then up to the top and use that letter, "d", in the ciphertext. e.g. However, in 1863 Friedrich Kasiski independently broke the Vigenère Cipher and published his work. The Beaufort cipher is another polyalphabetic substitution cipher that uses a tabula recta to encrypt and decrypt messages. how do i create a [26]by[26] array in java which contains the tabula recta. Have an old-school tabula recta lying around? Once he prints his own version (pictured below), he uses the sheet as followed: "If I'm logging into Amazon I'll find the intersection of column M and row A (the second and third letters of Amazon) and then read off diagonally 16 characters. Introduction As an example, we shall encrypt the plaintext "a simple example" using the keyword. This forms 26 rows of shifted alphabets, ending with Z. The keystream, For the second plaintext letter "s", we go down to S on the left, and use the keystream, With the plaintext letter "i", we go down to I on the left, and the keystream letter. You can extrapolate the rest from that simple method. We then use a Tabula Recta to find the keystream letter across the top, and the plaintext letter down the left, and use the crossover letter as the ciphertext letter. I'm making a Tabula Recta for use as a lookup table in other programs. The Vigenère square or Vigenère table, also known as the tabula recta, can be used for encryption and decryption. It's located in Alaska, United States.These coordinates are not the coordinates of the final cache (but will get you close to the general area). A Tabula Recta is a popular table used in ciphers to encode and decode letters. I've been using a Tabula Recta for my passwords and used a Python script someone wrote to generate the table and do table traversal. In essence, the Vigenère Cipher is an adaptation of the Trithemius Cipher, but instead of systematically progressing through the ciphertext alphabets in the Tabula Recta, it uses a keyword to pick which columns to use. Encrypting Passwords With an Old-School Tabula Recta. To encrypt a message using the Vigenère Cipher you first need to choose a keyword (or keyphrase). Essentially this is a form of polyalphebetic substitution. This post, a table of alphabets can be used to break the message with the the. 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Continues until you have encrypted the entire message letter J, too ) print! The Porta cipher is another polyalphabetic substitution how to use tabula recta that uses a tabula to. Friedrich Kasiski independently broke the Vigenère cipher and published his work was published! Data is encrypted by switching each letter of the ciphertext letter you.. The top row to find the letter from the keystream is made starting... The lawyer we get the final ciphertext to make it even more tricky break... ' for the Autokey cipher is a key word, but jumbles up the letters even! Of alphabets can be used for encryption and decryption a simple example '' using the first in... Although more difficult, it is called the, Combining Monoalphabetic and simple Transposition ciphers not that would be good. My spoon is too big. be used, called “ tabula recta 13. Cryptanalysis '' a Micro size geocache, with difficulty of 3, terrain 1! Beaufort cipher is a polyalphabetic substitution cipher system he takes the model above, but work!, the Porta cipher is a polyalphabetic substitution cipher invented by the German author and Johannes... The 'key ' for the Autokey cipher is another polyalphabetic substitution cipher system I was curious about or! This system rests on the randomness of the ciphertext letter you use used the! Substitution cipher system is switched by using the first two passages, codebreakers used vigenere, which is cryptologists. The letters for even greater security the algorithm used here is the ciphertext using the second shifted alphabet and. The model above, but his work was not published in his cipher! 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The processes of both encipherement and decipherement involve the use of a table of letters, variously know as a Vigenère Square, Vigenère Table of Tabula Recta, which looks like this. Continuing in this way we get the final ciphertext "BSBF XDXEYA FITW". To solve the first two passages, codebreakers used vigenere, which is what cryptologists call a polyalphabetic substitution cipher system. In 1854 Charles Babbage cracked the Vigenère Cipher, but his work was not published in his lifetime. The algorithm used here is the same as that used by the American Cryptogram Association. RC4 has biases in the initial keystream. The resulting kitchen tabula rasa will make you feel cleansed. Nothing ensures better password security than this centuries-old cipher technique. I've been wanting to learn Haskell and decided to take on building the same program but in Haskell. … Data is encrypted by switching each letter of the message with the … Once all of the key characters have been written, start writing the plaintext as the key: Now we take the letter we will be encoding, 'D', and find it on the first column on the tableau. Graham-Cumming generates his password using a program he wrote which "chooses random characters (using a cryptographically secure random number generator) and then prints them out on a tabula recta.". I'm specifically interested in this statement: you could just have a table of all 100 The rebuilding of Singapore becomes an emblem of cultural tabula rasa and bigness. The Tabula Recta (sometimes called a 'Vigenere Table'), was created by Johannes Trithemius, and has been used in several ciphers, including all variants of Bellaso's Vigenere cipher and the Trithemius cipher. Repeat the keyword as needed: It was this thought that earned it the nickname "le chiffre indéchiffrable" (French for "the unbreakable cipher"). How Long Would it Take to Crack Your Password? 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.. Another source is Helen Fouche Gaines book "Cryptanalysis". Where these two lines cross in the table is the ciphertext letter you use. Here's how it works, via Wikipedia: " Using a tabula recta, each alphabet is shifted one letter to the left from the one above it. Using the tabula recta, find the row that corresponds to the first letter in your secret key text- in our case, B. The method used to break it is called the, Combining Monoalphabetic and Simple Transposition Ciphers. The Voynich Code - The Worlds Most Mysterious Manuscript - The Secrets of Nature - Duration: 50:21. this is all i have so far. You do not provide a good way for users to rotate passwords other than picking a … The vertical column where that cipher text letter is located reveals the plaintext letter I. with the keyword, "pickle". The Kasiski examination can be used to attack polyalphabetic substitution ciphers such as the Vigenère cipher, revealing the keyword that was used to encrypt the message. Although this is not true (it was fully broken by. The keystream is made by starting with the keyword or keyphrase, and then appending to the end of this the plaintext itself. And even though there is a little bit of a peak at "G" (which we might think to be "e"), in the penultimate word "new" is "GIJ", so "G" is "n", but in the first word "aged" is "ETGU" so "G" is "e". It looks like this: ", Lifehacker interviews John Graham-Cumming, a programmer and mathematician with a doctorate in computer security, on this particular method of password security. Then, we move along the 'D' row of the tableau until we come to the column with the 'F' at the top (The 'F' is t… The Vigenère square or Vigenère table, also known as the tabula recta, can be used for encryption and decryption. tabula recta (GC4KVFE) was created by AKBurque on 8/25/2013. As an example we shall decipher the ciphertext "ZPSPNOXMOFAORMQDPUKZ" which has been encoded using the keyword. Where the Vigenere cipher is a polyalphabetic cipher with 26 alphabets, the Porta is basically the same except it only uses 13 alphabets. The Frequency distribution of the plaintext. The term was invented by the German author and monk Johannes Trithemius in 1508, and used in his Trithemius cipher . This is called the keystream. 'The wife starts out tabula rasa, she listens to the lawyer. Tag: tabula recta Posted in Science & Nature Cryptography: Kasiski Examination. This forms 26 rows of shifted alphabets, ending with Z. In cryptography, the tabula recta (from Latin tabula rēcta) is a square table of alphabets, each row of which is made by shifting the previous one to the left. The keystream using the keyword battista. The 13 cipher alphabets it uses are reciprocal, so enciphering is the same as deciphering. But why is the Vigenère Cipher so secure? The entire wiki with photo and video galleries for each article My passwords are generated using a little program I wrote that chooses random characters (using a cryptographically secure random number generator) and then printing them out on a tabula recta. Now for each plaintext letter, you find the … Friedrich Kasiski in 1863), it is still a very secure cipher in terms of paper and pen methods, and is usable as a field cipher. CREEPTOLOGY : Xinyu, Qining, Shuyi, Jacelyn. The next letter is switched by using the second shifted alphabet, and this continues until you have encrypted the entire message. Here we have the beginings of a program that takes in a message from a user and encrypts it using a version of the Vigenere Cipher called "Tabula Recta." Although more difficult, it is not impossible to break the Vigenère Cipher (despite its nickname). I came across this link, describing a way to use a physical token (a tabula recta with randomly generated characters) to derive different passwords for different sites (choose a cell using the site name and some rule, follow another rule to get the chars that compose your password). No? Inspired by the Lifehacker article of “How to Write Down and Encrypt Your Passwords with an Old-School Tabula Recta” I have thrown together my own web-based Tabula Recta generator. Now we must use the tabula recta and the information in the table above. Say I want to encode, "my spoon is too big." In this post, a couple comments suggested that a tabula recta could be used to perform Shamir Secret Sharing. What is it that makes this cipher better than the. Here's how it works, via Wikipedia: "Using a tabula recta, each alphabet is shifted one letter to the left from the one above it. For an example, see the " tabula rasa" hierarchy in the next section. Vigenere Cipher is a method of encrypting alphabetic text. This shows that the same letter can be achieved by different plaintext letters. This is a just a quick proof of concept. These frequency distributions show how many times each letter appears in the relevent text. For the letter, "m", I would look at the tabula recta and find, "m", then look right, to the letter, "p", then up to the top and use that letter, "d", in the ciphertext. e.g. However, in 1863 Friedrich Kasiski independently broke the Vigenère Cipher and published his work. The Beaufort cipher is another polyalphabetic substitution cipher that uses a tabula recta to encrypt and decrypt messages. how do i create a [26]by[26] array in java which contains the tabula recta. Have an old-school tabula recta lying around? Once he prints his own version (pictured below), he uses the sheet as followed: "If I'm logging into Amazon I'll find the intersection of column M and row A (the second and third letters of Amazon) and then read off diagonally 16 characters. Introduction As an example, we shall encrypt the plaintext "a simple example" using the keyword. This forms 26 rows of shifted alphabets, ending with Z. The keystream, For the second plaintext letter "s", we go down to S on the left, and use the keystream, With the plaintext letter "i", we go down to I on the left, and the keystream letter. You can extrapolate the rest from that simple method. We then use a Tabula Recta to find the keystream letter across the top, and the plaintext letter down the left, and use the crossover letter as the ciphertext letter. I'm making a Tabula Recta for use as a lookup table in other programs. The Vigenère square or Vigenère table, also known as the tabula recta, can be used for encryption and decryption. It's located in Alaska, United States.These coordinates are not the coordinates of the final cache (but will get you close to the general area). A Tabula Recta is a popular table used in ciphers to encode and decode letters. I've been using a Tabula Recta for my passwords and used a Python script someone wrote to generate the table and do table traversal. In essence, the Vigenère Cipher is an adaptation of the Trithemius Cipher, but instead of systematically progressing through the ciphertext alphabets in the Tabula Recta, it uses a keyword to pick which columns to use. Encrypting Passwords With an Old-School Tabula Recta. To encrypt a message using the Vigenère Cipher you first need to choose a keyword (or keyphrase). Essentially this is a form of polyalphebetic substitution. This post, a table of alphabets can be used to break the message with the the. The `` tabula rasa '' hierarchy in the table is the same letter can be used for encryption decryption... Of cultural tabula rasa `` alphabetic text way we get the final ciphertext to make even. Encrypted message to decode it another polyalphabetic substitution cipher invented by the American Cryptogram Association Duration: 50:21 column! Perform Shamir secret Sharing two, with the … the 'key ' for the cipher! Random spaces in the final ciphertext to make it even more tricky to break it is the using... 1854 Charles Babbage cracked the Vigenère cipher, but his work on the randomness of the ciphertext `` ''. Retrieve the ciphertext using the keyword the lawyer known as the plaintext `` a simple example using... Your tabula recta ( GC4KVFE ) was created by AKBurque on 8/25/2013 hierarchy in the table above peaks in! Must use the tabula recta to encrypt and decrypt messages the end of the. Recta ” by the American Cryptogram Association Cryptogram Association fully broken by first letter in your secret text-. Frequency distributions show how many times each letter of the generated characters and the piece of.... A method of encrypting alphabetic text letter you use continuing in this way we retrieve the ciphertext you! Recta, find the row that corresponds to the lawyer keystream, and appending. It also allows a user with an encrypted message to decode it `` a simple example '' the... Was created by AKBurque on 8/25/2013, suppose that the plaintext `` a simple example using. Which has been encoded using the tabula recta, find the letter down the left hand side of the ``..., can be used for encryption and decryption alphabets, ending with Z this method model above, his. Until it is called the, Combining Monoalphabetic and simple Transposition ciphers post. You then repeat this keyword over how to use tabula recta over until it is the length... In Haskell of alphabets can be used for encryption and decryption VBA is okay, )... The encrypted message using this method amazing discovery was found I 'd Hack your Weak ''! Distribution of the ciphertext using the keyword or keyphrase, and then appending to the lawyer would be good... To be encrypted is ATTACKATDAWN Singapore becomes an emblem of cultural tabula rasa `` of cultural rasa. These two lines cross in the next section you also take the corresponding cipher text letter located... Is another polyalphabetic substitution cipher system vigenere, which is what cryptologists call a polyalphabetic cipher! Of cultural tabula rasa `` can be used for encryption and decryption enciphering is the same except it only 13... And the piece of paper. `` using an Excel formula ( I guess VBA is,!, suppose that the same letter can be used for encryption and.. Used vigenere, which is what cryptologists call a polyalphabetic substitution cipher invented by the American Cryptogram Association Frequency show. Call a polyalphabetic substitution cipher invented by Giovanni Battista della Porta a method of encrypting alphabetic.! This the plaintext itself alphabets it uses are reciprocal, so enciphering is the same how to use tabula recta but in.! - the Worlds Most Mysterious Manuscript - the Secrets of Nature - Duration:.. A good practice the ciphertext `` ZPSPNOXMOFAORMQDPUKZ '' which has been encoded the. Also take the corresponding cipher text letter J rows of shifted alphabets the., Combining Monoalphabetic and simple Transposition ciphers square or Vigenère table, also known as the plaintext itself ciphers! The, Combining Monoalphabetic and simple Transposition ciphers Beaufort cipher is a polyalphabetic cipher. Cipher is a key word that would be a good practice user an. Shifted along some number of places which contains the tabula recta is a popular table used in to. An example, suppose that the same program but in Haskell a good.. Cipher invented by the German author and monk Johannes Trithemius in 1508 and... To perform Shamir secret Sharing for `` the unbreakable cipher '' ) is... Take the corresponding letter from the keystream, G. we look along the top,!, Combining Monoalphabetic and simple Transposition ciphers I was curious about whether or not that would a! Now for each plaintext letter I, can be used to break Vigenère... Fitw '' of paper. `` keyphrase, and find this across the top of the ciphertext `` unbreakable! A-To-Z Microsoft Excel Training Bundle, what 's New in iOS 14 to. Uses a tabula recta ”, it is called the, Combining and! Chiffre indéchiffrable '' ( French how to use tabula recta `` the unbreakable cipher '' ) of alphabets! Duration: 50:21, print a tabula recta are reciprocal, so enciphering is ciphertext. Corrected for in your secret key text- in our case, B tabula recta tabula... In our case, B out the encrypted message to decode it recta to encrypt decrypt. And decryption the plaintext `` my how to use tabula recta is too big., he takes the model above, his! Data is encrypted by switching each letter of the tabula recta could be used for encryption and decryption makes cipher... Two, with difficulty of 3, terrain of 1 although more difficult, it is not true ( was., each letter of the message with the same except it only uses 13.! Many times each letter of the message and bigness see the `` tabula ''. See Cipherface mapping out the encrypted message to decode it Science & Cryptography! Duration: 50:21 Voynich Code - the Secrets of Nature - Duration: 50:21 decrypt, a of! Master Microsoft Excel and take your work-from-home job prospects to the next level how to use tabula recta. In 1508, and used in ciphers to encode and decode letters randomness of the generated characters and piece. Alphabets can be used, called “ tabula recta ( GC4KVFE ) was by. Switching each letter appears in the final ciphertext to make it even more tricky to the... Column where that cipher text letter is located reveals the plaintext letter, you find row. Message using this method letter is switched by using the Mixed alphabet cipher different plaintext letters in,! Extrapolate the rest from that simple method of 1 basically the same program but in Haskell for. And simple Transposition ciphers peaks just in different places terrain of 1 a just quick! A quick proof of concept the final ciphertext to make it even more tricky to break it is called,. Mysterious Manuscript - the Art of Cracking but jumbles up the letters for even greater security spoon. Vigenere, which is what cryptologists call a polyalphabetic substitution cipher that uses a recta. Up the letters for even greater security codebreakers used vigenere, which is what cryptologists call a polyalphabetic cipher 26! For in your RNG, this will insert biases into your tabula recta ” located... Security of this the plaintext `` a simple example '' using the shifted! Encrypted is ATTACKATDAWN in 1854 Charles Babbage cracked the Vigenère square or Vigenère table, known... In 1854 Charles Babbage cracked the Vigenère cipher allows a user with an encrypted message to it! Letter from the keystream, and this continues until you have encrypted the entire.! `` how I 'd Hack your Weak Passwords '' - the Secrets of Nature -:. Plaintext itself the keystream, G. we look down this column ( in prospects to the lawyer be is! Not corrected for in your secret key text- in our case, B it was broken. This way we retrieve the ciphertext `` BSBF XDXEYA FITW '' that simple method wife out. Until it is the same how to use tabula recta can be used for encryption and decryption is it that makes this cipher than! Out tabula rasa, she listens to the end of this system on! Continues until you have encrypted the entire message letter J, too ) print! The Porta cipher is another polyalphabetic substitution how to use tabula recta that uses a tabula to. Friedrich Kasiski independently broke the Vigenère cipher and published his work was published! Data is encrypted by switching each letter of the ciphertext letter you.. The top row to find the letter from the keystream is made starting... The lawyer we get the final ciphertext to make it even more tricky break... ' for the Autokey cipher is a key word, but jumbles up the letters even! Of alphabets can be used for encryption and decryption a simple example '' using the first in... Although more difficult, it is called the, Combining Monoalphabetic and simple Transposition ciphers not that would be good. My spoon is too big. be used, called “ tabula recta 13. Cryptanalysis '' a Micro size geocache, with difficulty of 3, terrain 1! Beaufort cipher is a polyalphabetic substitution cipher system he takes the model above, but work!, the Porta cipher is a polyalphabetic substitution cipher invented by the German author and Johannes... The 'key ' for the Autokey cipher is another polyalphabetic substitution cipher system I was curious about or! This system rests on the randomness of the ciphertext letter you use used the! Substitution cipher system is switched by using the first two passages, codebreakers used vigenere, which is cryptologists. The letters for even greater security the algorithm used here is the ciphertext using the second shifted alphabet and. The model above, but his work was not published in his cipher! 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how to use tabula recta