Simple Encryption #1 - Alternating Split.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "from IPython.core.interactiveshell import InteractiveShell\n",
    "InteractiveShell.ast_node_interactivity = \"all\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##  Answer from Codewars"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "# Most upvoted answer\n",
    "\n",
    "def decrypt(text, n):\n",
    "    if text in (\"\", None):\n",
    "        return text\n",
    "    \n",
    "    ndx = len(text) // 2\n",
    "\n",
    "    for i in range(n):\n",
    "        a = text[:ndx]\n",
    "        b = text[ndx:]\n",
    "        text = \"\".join(b[i:i+1] + a[i:i+1] for i in range(ndx + 1))\n",
    "    return text\n",
    "\n",
    "\n",
    "\n",
    "def encrypt(text, n):\n",
    "    for i in range(n):\n",
    "        text = text[1::2] + text[::2]\n",
    "    return text"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Below is my own working progress"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'hsi  etTi sats!'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "PT = \"This is a test!\"\n",
    "PT[1::2] + PT[::2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "def encrypt(text, n):\n",
    "    if n == 0: return text\n",
    "    else:\n",
    "        a = text[1::2]\n",
    "        b = text[::2]\n",
    "        result = a + b\n",
    "    return encrypt(result, n-1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def decrypt(etext, n):\n",
    "    if n<=0: return etext\n",
    "    else:\n",
    "        "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "' Tah itse sits!'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "encrypt(PT, 3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def encrypt(text, n):\n",
    "    if n == 0: return text\n",
    "    else:\n",
    "        a = text[1::2]\n",
    "        b = text[::2]\n",
    "        result = a + b\n",
    "    return encrypt(result, n-1)\n",
    "def testN(PT, n):\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "7.5"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "14"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "(len(PT)/2)\n",
    "P1 = '123456789'\n",
    "P2 = 'ABCDEFGHIJKLMN'\n",
    "len(P2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 71,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "BDFHJLNPRTVACEGIKMOQSUW\n",
      "DHLPTAEIMQUBFJNRVCGKOSW\n",
      "HPAIQBJRCKSDLTEMUFNVGOW\n",
      "PIBRKDTMFVOHAQJCSLEUNGW\n",
      "IRDMVHQCLUGPBKTFOAJSENW\n",
      "RMHCUPKFASNIDVQLGBTOJEW\n",
      "MCPFSIVLBOERHUKANDQGTJW\n",
      "CFILORUADGJMPSVBEHKNQTW\n",
      "FLRAGMSBHNTCIOUDJPVEKQW\n",
      "LAMBNCODPEQFRGSHTIUJVKW\n",
      "ABCDEFGHIJKLMNOPQRSTUVW\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "23"
      ]
     },
     "execution_count": 71,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "11"
      ]
     },
     "execution_count": 71,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "P3 = 'ABCDEFGHIJKLMNOPQRSTUVW'\n",
    "for i in range(1, 100):\n",
    "    result = encrypt(P3, i)\n",
    "    print(result)\n",
    "    if result == P3:\n",
    "        break\n",
    "len(P3)\n",
    "i"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 79,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[5, 7, 18]"
      ]
     },
     "execution_count": 79,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "A = [1, 2, 3]\n",
    "B = [4, 5, 15]\n",
    "list(map(lambda x,y: x+y, A, B))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 92,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "def decrypt(etext, n):\n",
    "    if n<=0: return etext\n",
    "    else:\n",
    "        bp = len(etext)//2\n",
    "        left = list(etext[:bp])\n",
    "        right = list(etext[bp:])\n",
    "        if len(etext)%2 == 0:\n",
    "            edtext = ''.join(list(map(lambda x,y: x+y, right, left)))\n",
    "        else:\n",
    "            edtext = ''.join(list(map(lambda x,y: x+y, right, left))) + etext[-1]\n",
    "        return decrypt(edtext, n-1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 93,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'ABCDEFG'"
      ]
     },
     "execution_count": 93,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "decrypt('BDFACEG', 1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 81,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'ABCDEF'"
      ]
     },
     "execution_count": 81,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "A = ['A', 'C', 'E']\n",
    "B = ['B', 'D', 'F']\n",
    "''.join(list(map(lambda x,y: x+y, A, B)))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 73,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'ABCDEFG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'BDFACEG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'DAEBFCG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'ABCDEFG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'BDFACEG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'DAEBFCG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'ABCDEFG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'BDFACEG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'DAEBFCG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'ABCDEFG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'BDFACEG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'DAEBFCG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'ABCDEFG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'BDFACEG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'DAEBFCG'"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "P3 = 'ABCDEFG'\n",
    "for i in range(15):\n",
    "    encrypt(P3, i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'This is a test!'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'hsi  etTi sats!'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'s eT ashi tist!'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "' Tah itse sits!'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'This is a test!'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    },
    {
     "data": {
      "text/plain": [
       "'hsi  etTi sats!'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "for i in range(6):\n",
    "    encrypt(PT, i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "#A smart guy's answer"
   ]
  }
 ],
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