The task is to decipher the four ciphertext files called c1 , c2 , c3 and c4 without the knowledge of the keys (i.e. to “break” the ciphers). Each cipher is one of the following types: transposition...

The task is to decipher the four ciphertext files called
c1,
c2,
c3
and
c4
without the knowledge of the keys (i.e. to “break” the ciphers). Each cipher is one of the following types: transposition with a period
d, monoalphabetic substitution or polyalphabetic substitution.
For each ciphertext describe the steps you went through, what assumptions you made and why (e.g., IC indicates period of around 3, single- letter frequency distribution indicates transposition cipher, etc.).
Also, point which letter you replace etc.
Please give description of steps you did to break the ciphertext and what type of cipher?
2- You will need to use a program to help you break the ciphers, that is, to perform statistical analysis of the ciphertext, as well as to decrypt the ciphertext with a chosen cipher and key.
3- I recommend that you use JKrypto , you can download it from
http://www.unsw.adfa.edu.au/~lpb/src/jkrypto/index.html
4-Also, use this website to get the find trigrams and digrams of the ciphertext
http://practicalcryptography.com/cryptanalysis/text-characterisation/monogram-bigram-and-trigram-frequency-counts/
5-Then from their use this web:
http://www.richkni.co.uk/php/crypta/letreplace.php