added submission for bpham

bpham-assign1/caesar-cipher.txt

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+SBWKRQ

bpham-assign1/caesar-plain.txt

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+PYTHON

bpham-assign1/crypto.py

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+"""
+Assignment 1: Cryptography
+Course: CS 92SI
+Name: Brexton Pham
+Date: 10/9/15
+
+Cryptography suite!
+"""
+
+import itertools
+
+alphabetLower = "abcdefghijklmnopqrstuvwxyz"
+alphabetUpper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+
+def encrypt_caesar(plaintext):
+    """
+    Encrypts plaintext using a Caesar cipher.
+    Add more implementation details here.
+    """
+    result = ""
+    #print(alphabet)
+    for letter in plaintext:
+        if letter in alphabetUpper:
+            result += alphabetUpper[(alphabetUpper.index(letter) + 3) % 26]
+        else: 
+            result += alphabetLower[(alphabetLower.index(letter) + 3) % 26]
+    print(result)
+    return result  
+
+
+def decrypt_caesar(ciphertext):
+    """
+    #Decrypts a ciphertext using a Caesar cipher.
+    #Add more implementation details here.
+    """
+    result = ""
+    #print(alphabet)
+    for letter in ciphertext:
+        if letter in alphabetUpper:
+            result += alphabetUpper[(alphabetUpper.index(letter) - 3) % 26]
+        else: 
+            result += alphabetLower[(alphabetLower.index(letter) - 3) % 26]
+    print(result)
+    return result  
+
+def encrypt_vigenere(plaintext, keyword):
+    """
+    #Encrypts plaintext using a Vigenere cipher with a keyword.
+    #Add more implementation details here.
+    """
+    print(plaintext)
+    result = ""
+    cycle = itertools.cycle(keyword)
+    key = ""
+    i = 0
+    for letter in cycle:
+
+        i += 1
+        key += letter.lower()
+        if i >= len(plaintext):
+            break
+    #print(alphabetLower.index(key[0]))
+    j = 0
+    for letter in plaintext:
+        if letter in alphabetUpper:
+            result += alphabetUpper[(alphabetUpper.index(letter) + alphabetLower.index(key[j])) % 26]
+        else: 
+            result += alphabetLower[(alphabetLower.index(letter) + alphabetLower.index(key[j])) % 26]
+        j = j + 1
+    print(result)
+    return result
+
+
+def decrypt_vigenere(ciphertext, keyword):
+    """
+    #Decrypts ciphertext using a Vigenere cipher with a keyword.
+    #Add more implementation details here.
+    """
+    result = ""
+    cycle = itertools.cycle(keyword)
+    key = ""
+    i = 0
+    for letter in cycle:
+        i += 1
+        key += letter.lower()
+        if i >= len(ciphertext):
+            break
+    #print(alphabetLower.index(key[0]))
+    j = 0
+    for letter in ciphertext:
+        if letter in alphabetUpper:
+            result += alphabetUpper[(alphabetUpper.index(letter) -  alphabetLower.index(key[j])) % 26]
+        else: 
+            result += alphabetLower[((alphabetLower.index(letter)) - (alphabetLower.index(key[j]))) % 26]
+        j = j + 1
+    print(result)
+    return result
+
+def encrypt_railfence(plaintext, num_rails):
+    """
+    #Encrypts plaintext using a railfence cipher.
+    #Add more implementation details here.
+    """
+    result = [None] * len(plaintext)
+    brextonIsSoCool = 2 * (num_rails - 1)
+    tracker = 0
+    counter = 0
+
+    while counter < num_rails:
+
+        size = brextonIsSoCool - 2 * counter
+        i = counter
+        equals = 1
+        while i < len(plaintext):
+            result[tracker] = plaintext[i] #switch
+
+            if equals == 0 or (size == 0):
+                i += (brextonIsSoCool - size)
+            else:
+                i += size
+
+            if counter!= 0: 
+                equals = 0
+
+            tracker += 1
+        counter += 1
+
+    return "".join(result)
+
+def decrypt_railfence(ciphertext, num_rails):
+    """
+    #Encrypts plaintext using a railfence cipher.
+    #Add more implementation details here.
+    """
+    result = [None] * len(ciphertext)
+    brextonIsSoCool = 2 * (num_rails - 1)
+    tracker = 0
+    counter = 0
+
+    while counter < num_rails:
+
+        size = brextonIsSoCool - 2 * counter
+        i = counter
+        equals = 1
+        while i < len(ciphertext):
+            result[i] = ciphertext[tracker] #switch
+
+            if equals == 0 or (size == 0):
+                i += (brextonIsSoCool - size)
+            else:
+                i += size
+
+            if counter!= 0: 
+                equals = 0
+
+            tracker += 1
+        counter += 1
+
+    return "".join(result)
+
+def read_from_file(filename):
+    """
+    #Reads and returns content from a file.
+    #Add more implementation details here.
+    """
+
+    with open(filename, 'r') as f:
+        content = f.read()
+
+    return content
+
+
+
+def write_to_file(filename, content):
+    """
+    #Writes content to a file.
+    #Add more implementation details here.
+    """
+    # Your implementation here
+    with open(filename, 'w') as f:
+        f.write(content)
+
+
+
+
+def run_suite():
+    """
+    #Runs a single iteration of the cryptography suite.
+
+    #Asks the user for input text from a string or file, whether to encrypt
+    #or decrypt, what tool to use, and where to show the output.
+    """
+    resultText = ""
+    print("*Input*")
+    desiredInput = input("(F)ile or (S)tring? ")
+    while (desiredInput != "f" and desiredInput != "F" and desiredInput != "s" and desiredInput != "S"):
+        desiredInput = input("Please input either S for string or F for file! ")
+    string = ""
+    if (desiredInput.upper() == "S"):
+        string = input("Enter the string to de/encrypt: ")  # Obtain the user's desired input here
+    elif (desiredInput.upper() == "F"):
+        filename = input("Filename: ")
+        string = read_from_file(filename)
+
+    string = string.replace(" ", "")
+    string = string.replace("!", "")
+    string = string.replace("@", "")
+    string = string.replace("#", "")
+    string = string.replace("$", "")
+    string = string.replace("%", "")
+    string = string.replace("^", "")
+    string = string.replace("&", "")
+    string = string.replace("*", "")
+    string = string.replace("(", "")
+    string = string.replace(")", "")
+    string = string.replace("-", "")
+    string = string.replace("+", "")
+    string = string.replace("=", "")
+    string = string.replace("-", "")
+    string = string.replace("[", "")
+    string = string.replace("]", "")
+    string = string.replace("{", "")
+    string = string.replace("}", "")
+    string = string.replace("|", "")
+    string = string.replace(";", "")
+    string = string.replace(":", "")
+    string = string.replace("<", "")
+    string = string.replace(">", "")
+    string = string.replace(".", "")
+    string = string.replace(",", "")
+    string = string.replace("/", "")
+
+    print("*Transform*")
+    transform = input("(E)ncrypt or (D)ecrypt? ")
+    while (transform != "e" and transform != "E" and transform != "d" and transform != "D"):
+        transform = input("Please input either E for encrypt or D for decrypt! ")  # Encrypt or decrypt the input
+    whichOne = input("(C)aesar, (V)igenere, or (R)ailfence? ")
+    while (whichOne!= "C" and whichOne != "c" and whichOne != "V" and whichOne != "v" and whichOne != "r" and whichOne != "R"):
+        whichOne = input("Please input either C for Caesar or V for Vigenere or R for Railfence! ")
+    if (transform.upper() == "E" and whichOne.upper() == "V"):
+        passkey = input("Passkey? ")
+        print("Encrypting using Vigenere cipher!")
+        resultText = encrypt_vigenere(string, passkey)
+    elif (transform.upper() == "D" and whichOne.upper() == "V"):
+        passkey = input("Passkey? ")
+        print("Decrypting using Vigenere cipher!")
+        resultText = decrypt_vigenere(string, passkey)
+    elif (transform.upper() == "E" and whichOne.upper() == "C"):
+        print("Encrypting using Caesar cipher!")
+        resultText = encrypt_caesar(string)
+    elif (transform.upper() == "D" and whichOne.upper() == "C"):
+        print("Decrypting using Caesar cipher!")
+        resultText = decrypt_caesar(string)
+    elif (transform.upper() == "E" and whichOne.upper() == "R"):
+        rails = input("Please enter a positive integer of rails! ")
+        print("Encrypting using Railfence cipher!")
+        resultText = encrypt_railfence(string, int(rails))
+    elif (transform.upper() == "D" and whichOne.upper() == "R"):
+        rails = input("Please enter a positive integer of rails! ")
+        print("Decrypting using Railfence cipher!")
+        resultText = decrypt_railfence(string, int(rails))
+
+
+    print("*Output*")
+    outputChoice = input("(F)ile or (S)tring? ") 
+    while (outputChoice != "f" and outputChoice != "F" and outputChoice != "s" and outputChoice != "S"):
+        outputChoice = input("Please input either S for string or F for file! ")
+    end = ""
+    if (outputChoice.upper() == "F"):
+        end = input("Filename? ")
+        print("Writing to file")
+        write_to_file(end, resultText) # Print or write the transformed output
+    elif(outputChoice.upper() == "S"):
+        print(resultText)
+
+
+# Do not modify code beneath this point.
+def should_continue():
+    """
+    #Asks the user whether they would like to continue.
+    #Responses that begin with a `Y` return True. (case-insensitively)
+    #Responses that begin with a `N` return False. (case-insensitively)
+    #All other responses (including '') cause a reprompt.
+    """
+    choice = input("Again (Y/N)? ").upper()
+    while not choice or choice[0] not in ['Y', 'N']:
+        choice = input("Please enter either 'Y' or 'N'. Again (Y/N)? ").upper()
+    return choice[0] == 'Y'
+
+#name = input("what is your name?")
+def main():
+    """Harness for the Cryptography Suite"""
+    print("Welcome to the Cryptography Suite!")
+    run_suite()
+    while should_continue():
+       run_suite()
+    print("Goodbye!")
+
+
+
+if __name__ == '__main__':
+    """This block is run if and only if the Python script is invoked from the
+    command line."""
+    main()

bpham-assign1/feedback.txt

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+Name: Brexton Pham
+1) How long did this assignment take you to complete?
+	6+ hours
+
+
+2) What has been the best part of the class so far?
+	Sam teaching
+
+
+
+
+3) What can we do to make this class more enjoyable for you?
+	More food
+
+
+
+
+4) What types of assignments would excite you in this class?
+	Applications-Projects
+
+
+
+

bpham-assign1/railfence-cipher.txt

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+WECRLTEERDSOEEFEAOCAIVDEN

bpham-assign1/railfence-plain.txt

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+WE ARE DISCOVERED. FLEE AT ONCE

bpham-assign1/secret_message.txt

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+KHOORZRUOG

bpham-assign1/vigenere-cipher.txt

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+LXFOPVEFRNHR

bpham-assign1/vigenere-plain.txt

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+Attack At Dawn!