Polyalphabetic Ciphers Suppose the following ciphertext was encrypted using Vignenere cipher with key size equal to...
Polyalphabetic Ciphers
Suppose the following ciphertext was encrypted using Vignenere
cipher with key size equal to 2. Try to find the two letters that
were used in the encryption.
SVSMHSCXGROFSLSOBDVOICIKZWSMVKBSGWPIKRWMVWCNSBBBSZFOGOBDODWFSNSWCMFKQIV
KGYDOFKHOROZOQDWYBCAKMPWVZYTPWMSCWXHRSVSQWCZKHEFOGYAOHSAOGSBDVOSHSMID
WFSKBNXERSQSOBMKBNTYFBSQWYBKZKBNZYQKZQCFSBBWSXHDVSGZFYQOGCWCOVGYICSNWXAK
BICDVOFZFSJKHOOXRLICWXSCGYFQOXWJODWYBCTBCWQVILGDCFCVIXHKFIOCGYQSODWYBCOXR
MCBDYFKHSCXGDVOIXWFSBGKZEGOCPSVSMHSCXGKGKHYCVTYFCSVSMHSBQFODBSCSXHKHSJOGSB
WCNSBBBSZFOGOBDODWFSNSWCMFKQSSCWCWXQYBDFKGDKSHRHRSZFKQDWMSSBDVOROAYQB
ODWMOBQRSDMZSKBMWOBDODVOBCKRSBSDVOSVSMHSCXGGSBSXCDICSNKOFOQYBCWNSBSNO
XCVWQOBQRWMWXGDWDIDWYBKBNAYGDDYZSHSQKZYTPWMSCKOFOTSZVSNICWXUCCBHSHSCX
OVGYYXCGBKGKZVCDAOBDPIKRWMVYTPWMSRCVROFCKOFOQRCCSXPIZYH
Homework Answers
the 2 letters used in Encryption are "O K"
The key can be found by dividing text in groups of 2 and then finding the frequency of alphabets appearing in the text.
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Polyalphabetic Ciphers
Suppose the following ciphertext was encrypted using Vignenere
cipher with key size equal to...
(a) The ciphertext ITFO was encrypted by a Hill cipher with a 2×2 matrix. The plaintext...
(a) The ciphertext ITFO was encrypted by a Hill cipher with a 2×2 matrix. The plaintext is dont. Find the encryption matrix. (b) Suppose the ciphertext is ITFE and the plaintext is still dont. Find the encryption matrix. Note that the second column of the matrix is changed. What does it mean? Is it a good or a bad property of a cipher. Discuss.
Substitution Cipher Ke 1. Decipher the following ciphertext using the substitution cipher key shown above: (4 points) Ciphertext: DOVMYWOJAYJMYWZBAOXOADY!U I Plaintext: The following information was...
Substitution Cipher Ke 1. Decipher the following ciphertext using the substitution cipher key shown above: (4 points) Ciphertext: DOVMYWOJAYJMYWZBAOXOADY!U I Plaintext: The following information was extracted from The BLACK Chamber's Pigpen Cipher page. The content is available at https:/simonsingh net The_Black Chamber'pigpen html. "The Pigpen Cipher was used by Freemasons in the l8th Century to keep their records private. The cipher does not substitute one letter for another; rather it substitutes each letter for a symbol The aiphabet is written...
The decryption for step 1 is : THE CIPHER KEY IS NINE 2) If you correctly...
The decryption for step 1 is : THE CIPHER KEY IS NINE
2) If you correctly decrypted the message from step 1, you now have the encryption key for the original ciphertext, CQNTNHRBDWMNACQNVJC. Use this key and your knowledge of Caesar ciphers to decrypt the first message and find the location of the secret object. Cryptography | 233 ELIVERABLES Turn in your handwritten answers on a sheet of paper. Be sure to show your work, especially the grid you constructed...
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1. Encrypt the message howareyou using the affine cipher using the key (7,3). (a) What is the resulting ciphertext? (b) What is the decryption function you can use to decipher each ciphertext character? (c) Use your decryption function to decrypt the message to confirm you get the ciphertext back. 2. Use the ADFGX cipher using the grid below and the keyword "place" to encrypt the plaintext "brandenburggate". FREE GX (a) (b) What is the resulting ciphertext? How does the ADFGC...
1. The following message has been encrypted with a shift cipher. Decrypt the message. nggnpxrarzlonfrngqnja 2....
1. The following message has been encrypted with a shift cipher. Decrypt the message. nggnpxrarzlonfrngqnja 2. The following message has been encrypted with an ane cipher. Recover the encryption key. uiggwfjoakwievscjofdguejwevscjofdguhcjajinfcsjendifdefquwfdwuegwajinfcsjendo akwiuhcjpcfdwrajinfocrchnveorfwxferllwajinfocrchaondwjfwxffdwkwiugeipwolwrfo aevcjfdwjwgeipweuognvwfjeruhcjgefocrfcscpwfmwwrfdwfmckwiufdwkwiuornjeafoawjw njwuwrfeudejwluwajwfpwfmwwrfmccjgcjwnejfowufdefaerpwquwlfcgeorfeorenjobefwor hcjgefocrvork
How to write a program in order to find the key? Given a ciphertext message that...
How to write a program in order to find the key? Given a ciphertext message that was generated using the XOR cipher and a bit string found in the plaintext, find the key that can be used to map the plaintext to the ciphertext. The key size is 32 bits.
Part 3: Transposition Ciphers #can't use ord or chr functions You must implement three transposition ciphers...
Part 3: Transposition Ciphers #can't use ord or chr functions You must implement three transposition ciphers (the "backwards" cipher, the Rail Fence cipher, and the Column Transposition cipher) where the ciphertext is created via an altered presentation of the plaintext. The algorithm for each is detailed in the function descriptions in this section. (13 points) def backwards_cipher(plaintext, key): • Parameter(s): plaintext ----- a string; the message to be encrypted key ----- an integer; the number to control this cipher •...
What happens when two plaintexts are encrypted with the same key using a stream cipher? Show...
What happens when two plaintexts are encrypted with the same key using a stream cipher? Show the problem that arises using EXOR math.
Using the Hill cipher, decrypt the ciphertext, “BOHBFBTLTTNKKC” with the key, 1-1 3 K= Li -2]...
Using the Hill cipher, decrypt the ciphertext, “BOHBFBTLTTNKKC” with the key, 1-1 3 K= Li -2] Show all steps in the Hill method.
Assuming the following has been encrypted with a Vigenere cipher below, use the method(s) and assumptions...
Assuming the following has been encrypted with a Vigenere cipher below, use the method(s) and assumptions to obtain the key of it. (Hint, you should get summer as the key, just show how to do it with the ciphertext below): SBGYEETYUZKJZIGXHSWUNXIKGWTMRXWUPUEGWLBXEESHUZZRKCAZFLLWTQVR ZISOSEFUETMGVYEUKESVGUPUAHSIVZLYMESEFYFNECSHOQETUIGZXJTOUXHR OUXXWVLUNARVUIYRSILNTQHPAHSFEBWIDPIIKAUHIFJXQDWTGIBQVRLYMOXR DIZQWFDPQQULSNUARJSHMXCQWUZQAGJINXIDHCFOLDSHGDIGJISDEDSWAYTL LYDOSFCUF
Substitution Cipher Ke 1. Decipher the following ciphertext using the substitution cipher key shown above: (4 points) Ciphertext: DOVMYWOJAYJMYWZBAOXOADY!U I Plaintext: The following information was extracted from The BLACK Chamber's Pigpen Cipher page. The content is available at https:/simonsingh net The_Black Chamber'pigpen html. "The Pigpen Cipher was used by Freemasons in the l8th Century to keep their records private. The cipher does not substitute one letter for another; rather it substitutes each letter for a symbol The aiphabet is written...
The decryption for step 1 is : THE CIPHER KEY IS NINE
2) If you correctly decrypted the message from step 1, you now have the encryption key for the original ciphertext, CQNTNHRBDWMNACQNVJC. Use this key and your knowledge of Caesar ciphers to decrypt the first message and find the location of the secret object. Cryptography | 233 ELIVERABLES Turn in your handwritten answers on a sheet of paper. Be sure to show your work, especially the grid you constructed...
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Using the Hill cipher, decrypt the ciphertext, “BOHBFBTLTTNKKC” with the key, 1-1 3 K= Li -2] Show all steps in the Hill method.
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