Initial commit

2025-02-03 23:42:11 +00:00 · 2025-02-03 23:42:11 +00:00 · 692575e622
commit 692575e622
12 changed files with 496 additions and 0 deletions
--- a/.commit_template
+++ b/.commit_template
@ -0,0 +1,10 @@
+
+
+# -----------------------------------------------------------------
+# Checkpoint 1: This is one of the first times you are being asked
+# to write your own code to help you solve a problem. Describe your
+# experience. Did writing code help you understand the problem better?
+# explain. 
+#
+# Checkpoint 2: Describe the strategy you used to find the polyalphabetic
+# secret word, and then to decrypt the secret message.
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,2 @@
+.DS_Store
+__pycache__
--- a/answers.md
+++ b/answers.md
@ -0,0 +1,25 @@
+# Encryption lab answers
+
+## Checkpoint 1
+
+0. `secrets/secret0.txt` is encrypted using a Caesar Cipher. What is
+   its secret number?
+
+1. `secrets/secret1.txt` is encrypted using a Caesar Cipher. What is
+   its secret number?
+
+2. `secrets/secret2.txt` is encrypted using a Caesar Cipher. What is
+   its secret number?
+
+3. `secrets/secret3.txt` is encrypted using a Caesar Cipher. What is
+   its secret number?
+
+4. `secrets/secret4.txt` is encrypted using a Caesar Cipher. What is
+   its secret number?
+
+## Checkpoint 2
+
+5. What is the polyalphabetic secret word?
+
+6. Decrypt this message, which was encrypted using the same secret word:
+   "EbZhdaV[h^bTpchhQnhig]X[VmhhRP]ftXVnRfjVY]fgtO_X]("
--- a/ciphers/caesar.py
+++ b/ciphers/caesar.py
@ -0,0 +1,55 @@
+from easybits import Bits
+
+class CaesarCipher:
+    """Implements the caeser cipher. 
+    In the caeser cipher, each character is converted into a number, 
+    then a secret number is added to each (if the result is too large, we 
+    loop it back around), and the result is converted back into another 
+    character.
+
+    int_min and int_max represent the lowest and highest allowed int values
+    of characters. They are set to include all the ASCII printable
+    characters (https://en.wikipedia.org/wiki/ASCII#Printable_character_table)
+
+    ASCII values outside this range (for example, '\n', the newline character),
+    just get passed through unencrypted.
+    """
+
+    int_min = 32
+    int_max = 127
+
+    def __init__(self, secret):
+        self.secret = secret
+
+    def encrypt(self, plaintext):
+        "Converts a plaintext message into an encrypted ciphertext"
+        ciphertext = []
+        for char in plaintext:
+            plain_int = Bits(char, encoding='ascii').int
+            if self.int_min <= plain_int and plain_int < self.int_max:
+                cipher_int = self.rotate(self.secret, plain_int)
+                ciphertext.append(Bits(cipher_int, length=8).ascii)
+            else:
+                ciphertext.append(char)
+        return ''.join(ciphertext)
+
+    def decrypt(self, ciphertext):
+        "Converts an encrypted ciphertext into a plaintext message"
+        plaintext = []
+        for char in ciphertext:
+            cipher_int = Bits(char, encoding='ascii').int
+            if self.int_min <= cipher_int and cipher_int < self.int_max:
+                plain_int = self.rotate(-self.secret, cipher_int)
+                plaintext.append(Bits(plain_int, length=8).ascii)
+            else:
+                plaintext.append(char)
+        return ''.join(plaintext)
+
+    def rotate(self, secret, x):
+        """Adds a secret number to x. 
+        The modulo operator (%) is used to ensure that the result
+        is greater than equal to int_min and less than int_max. 
+        """
+        range_size = self.int_max - self.int_min
+        return (x + secret - self.int_min) % range_size + self.int_min
+
--- a/ciphers/poly.py
+++ b/ciphers/poly.py
@ -0,0 +1,69 @@
+from itertools import cycle
+from easybits import Bits
+
+class PolyCipher:
+    """Implements a polyalphabetic cipher.
+    The polyalphabetic cipher is like a Caesar cipher except that 
+    the secret number changes for each character to be encrypted or
+    decrypted. This makes frequency analysis much harder, because
+    each plaintext space can be encrypted as a different character. 
+
+    int_min and int_max represent the lowest and highest allowed int values
+    of characters. They are set to include all the ASCII printable
+    characters (https://en.wikipedia.org/wiki/ASCII#Printable_character_table)
+
+    ASCII values outside this range (for example, '\n', the newline character),
+    just get passed through unencrypted.
+    """
+
+    int_min = 32
+    int_max = 127
+
+    def __init__(self, secret):
+        self.secret = secret
+
+    def encrypt(self, plaintext):
+        "Converts a plaintext message into an encrypted ciphertext"
+        ciphertext = []
+        for char, secret_char in zip(plaintext, cycle(self.secret)):
+            plain_int = Bits(char, encoding='ascii').int
+            if self.int_min <= plain_int and plain_int < self.int_max:
+                secret_int = self.get_int(secret_char)
+                cipher_int = self.rotate(secret_int, plain_int)
+                ciphertext.append(Bits(cipher_int, length=8).ascii)
+            else:
+                ciphertext.append(char)
+        return ''.join(ciphertext)
+
+    def decrypt(self, ciphertext):
+        "Converts an encrypted ciphertext into a plaintext message"
+        plaintext = []
+        for char, secret_char in zip(ciphertext, cycle(self.secret)):
+            cipher_int = Bits(char, encoding='ascii').int
+            if self.int_min <= cipher_int and cipher_int < self.int_max:
+                secret_int = self.get_int(secret_char)
+                plain_int = self.rotate(-secret_int, cipher_int)
+                plaintext.append(Bits(plain_int, length=8).ascii)
+            else:
+                plaintext.append(char)
+        return ''.join(plaintext)
+
+    def rotate(self, secret, x):
+        """Adds a secret number to x. 
+        The modulo operator (%) is used to ensure that the result
+        is greater than equal to int_min and less than int_max. 
+        """
+        range_size = self.int_max - self.int_min
+        return (x + secret - self.int_min) % range_size + self.int_min
+
+    def get_int(self, secret_char):
+        """Converts an int or a single-character string into an int.
+        When `secret_char` is an int, we just return it. Otherwise we
+        return the character's ASCII value.
+        """
+        if isinstance(secret_char, int):
+            return secret_char
+        else:
+            return Bits(secret_char, encoding='ascii').int
+
+
--- a/poetry.lock
+++ b/poetry.lock
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+# This file is automatically @generated by Poetry 2.0.0 and should not be changed by hand.
+
+[[package]]
+name = "bitarray"
+version = "3.0.0"
+description = "efficient arrays of booleans -- C extension"
+optional = false
+python-versions = "*"
+groups = ["main"]
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+]
+
+[[package]]
+name = "easybits"
+version = "0.1.4"
+description = "A friendly interface for exploring bits."
+optional = false
+python-versions = "<4.0,>=3.9"
+groups = ["main"]
+files = [
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+]
+
+[package.dependencies]
+bitarray = ">=3.0.0,<4.0.0"
+
+[metadata]
+lock-version = "2.1"
+python-versions = ">=3.10,<4.0"
+content-hash = "df61bd1ca8e15e76d211947a3e194948a941734bba9c9010e446a990f5a8661f"
--- a/pyproject.toml
+++ b/pyproject.toml
@ -0,0 +1,21 @@
+[project]
+name = "lab-encryption"
+version = "0.1.0"
+description = ""
+authors = [
+    {name = "Chris Proctor",email = "chris@chrisproctor.net"}
+]
+license = {text = "MIT"}
+readme = "README.md"
+requires-python = ">=3.10,<4.0"
+dependencies = [
+    "easybits (>=0.1.4,<0.2.0)"
+]
+
+
+[build-system]
+requires = ["poetry-core>=2.0.0,<3.0.0"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry]
+package-mode = false
--- a/secrets/secret0.txt
+++ b/secrets/secret0.txt
@ -0,0 +1,29 @@
+ChVTanChVTaznQda]X]VnQaXVWczn
+8]ncWTnU^aTbcbn^UncWTn]XVWc*n
+FWPcnX\\^acP[nWP]Sn^anThTzn
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+
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+>]nfWPcnfX]VbnSPaTnWTnPb_XaT.
+FWPcncWTnWP]SznSPaTnbTXiTncWTnUXaT.
+
+0]SnfWPcnbW^d[STazntnfWPcnPacz
+2^d[SncfXbcncWTnbX]Tfbn^UncWhnWTPac.
+0]SnfWT]ncWhnWTPacnQTVP]nc^nQTPc|
+FWPcnSaTPSnWP]S.ntnfWPcnSaTPSnUTTc.
+
+FWPcncWTnWP\\Ta.nfWPcncWTnRWPX]z
+8]nfWPcnUda]PRTnfPbncWhnQaPX].
+FWPcncWTnP]eX[.nfWPcnSaTPSnVaPb_|
+3PaTnXcbnSTPS[hncTaa^abnR[Pb_.
+
+FWT]ncWTnbcPabncWaTfnS^f]ncWTXanb_TPabn
+0]SnfPcTauSnWTPeT]nfXcWncWTXancTPab)
+3XSnWTnb\X[TnWXbnf^aZnc^nbTT.
+3XSnWTnfW^n\PSTncWTn;P\Qn\PZTncWTT.
+
+ChVTanChVTanQda]X]VnQaXVWcz
+8]ncWTnU^aTbcbn^UncWTn]XVWc)
+FWPcnX\\^acP[nWP]Sn^anThTz
+3PaTnUaP\TncWhnUTPaUd[nbh\\Tcah.
--- a/secrets/secret1.txt
+++ b/secrets/secret1.txt
@ -0,0 +1,19 @@
+Pof!nvtu!ibwf!b!njoe!pg!xjoufs
+Up!sfhbse!uif!gsptu!boe!uif!cpvhit
+Pg!uif!qjof.usfft!dsvtufe!xjui!topx<
+
+Boe!ibwf!cffo!dpme!b!mpoh!ujnf
+Up!cfipme!uif!kvojqfst!tibhhfe!xjui!jdf-
+Uif!tqsvdft!spvhi!jo!uif!ejtubou!hmjuufs
+
+Pg!uif!Kbovbsz!tvo<!boe!opu!up!uijol
+Pg!boz!njtfsz!jo!uif!tpvoe!pg!uif!xjoe-
+Jo!uif!tpvoe!pg!b!gfx!mfbwft-
+
+Xijdi!jt!uif!tpvoe!pg!uif!mboe
+Gvmm!pg!uif!tbnf!xjoe
+Uibu!jt!cmpxjoh!jo!uif!tbnf!cbsf!qmbdf
+
+Gps!uif!mjtufofs-!xip!mjtufot!jo!uif!topx-
+Boe-!opuijoh!ijntfmg-!cfipmet
+Opuijoh!uibu!jt!opu!uifsf!boe!uif!opuijoh!uibu!jt/
--- a/secrets/secret2.txt
+++ b/secrets/secret2.txt
@ -0,0 +1,59 @@
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--- a/secrets/secret3.txt
+++ b/secrets/secret3.txt
@ -0,0 +1,14 @@
+3DAJ[PK[PDA[OAOOEKJO[KB[OSAAP[OEHAJP[PDKQCDP
+%[OQIIKJ[QL[NAIAI>N=J?A[KB[PDEJCO[L=OPg
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+|J@[DA=REHU[BNKI[SKA[PK[SKA[PAHH[KbAN
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--- a/secrets/secret4.txt
+++ b/secrets/secret4.txt
@ -0,0 +1,25 @@
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