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What substitution system results when you use a 25 x 1 playfair matrix?

Caesar Cipher


What is difference between substitution cipher and transposition cipher?

Subtitution: each letter retains its position but changes its identity, Transposition: each letter retains its identity but changes its position.


Difference of polyalphabetic substitution cipher and polyalphabetic cipher?

In a monoalphabetic cipher, our substitution characters are arandom permutation of the 26 letters of the alphabet:plaintext letters: a b c d e f .....substitution letters: t h i j a b .....• The key now is the sequence of substitution letters. In otherwords, the key in this case is the actual random permutation ofthe alphabet used.For a particular alphabet, only one substitution can be usedexample: if the substitution letter for 'a' is 't' and for 'd' it is 'p'then if the keyword happens to be "tpp"..... then we can encrypt the message as "add"(note that the substitution letter for 'd' is only 'p'..In a monoalphabetic cipher, the same substitution rule is used forevery substitution. In a polyalphabetic cipher, the substitutionrule changes continuously from letter to letter according to theelements of the encryption key.Example for polyalphabetic:key: abracadabraabracadabraabracadabraabplaintext: canyoumeetmeatmidnightihavethegoodsciphertext: CBEYQUPEFKMEBK.....................• The Vigenere cipher is an example of a polyalphabetic cipher.


What is the name of Nancy Drew enemy in The clue in the Crossword Cipher?

El Gato


What is difference between monoalphabetic and polyalphabetic cipher?

In a monoalphabetic cipher, our substitution characters are a random permutation of the 26 letters of the alphabet: plaintext letters: a b c d e f ..... substitution letters: t h i j a b ..... • The key now is the sequence of substitution letters. In other words, the key in this case is the actual random permutation of the alphabet used. For a particular alphabet, only one substitution can be used example: if the substitution letter for 'a' is 't' and for 'd' it is 'p' then if the keyword happens to be "tpp"..... then we can encrypt the message as "add"(note that the substitution letter for 'd' is only 'p'.. In a monoalphabetic cipher, the same substitution rule is used for every substitution. In a polyalphabetic cipher, the substitution rule changes continuously from letter to letter according to the elements of the encryption key. Example for polyalphabetic: key: abracadabraabracadabraabracadabraab plaintext: canyoumeetmeatmidnightihavethegoods ciphertext: CBEYQUPEFKMEBK..................... • The Vigenere cipher is an example of a polyalphabetic cipher.

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