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1 | 1 | # 1. Receive a message and then encrypt it by shifting the |
2 | 2 | # characters by a requested amount to the right. |
3 | 3 |
|
4 | | -# A becomes D, B becomes E, for example. Also |
5 | | -# decrypt the message back. |
| 4 | +# A becomes D, B becomes E, for example. Also, decrypt the message back. |
6 | 5 |
|
| 6 | +# HINTS |
| 7 | + |
| 8 | +# 1. A-Z have the numbers 65-90 in unicode |
| 9 | +# 2. a-z have the numbers 97-122 |
| 10 | +# 3. You get the unicode of a character with ord(yourLetter) |
| 11 | +# 4. You covert from unicode to character with chr(yourNumber) |
| 12 | +# 5. Use isupper() to decide which unicode to work with |
| 13 | +# 6. Add the key (number of characters to shift)... if bigger or smaller then |
| 14 | +# the unicode for A, Z, a, or z increase or decrease by 26 |
| 15 | + |
| 16 | +message = input("Enter your message: ") |
| 17 | +key = int(input("How many characters should we shift (1-26): ")) |
| 18 | +secret_message = "" |
| 19 | + |
| 20 | +for char in message: |
| 21 | + if char.isalpha(): |
| 22 | + char_code = ord(char) + key |
| 23 | + |
| 24 | + if char.isupper(): |
| 25 | + if char_code > ord("Z"): |
| 26 | + char_code -= 26 |
| 27 | + elif char_code < ord("A"): |
| 28 | + char_code += 26 |
| 29 | + else: |
| 30 | + if char_code > ord("z"): |
| 31 | + char_code -= 26 |
| 32 | + elif char_code < ord("a"): |
| 33 | + char_code += 26 |
| 34 | + secret_message += chr(char_code) |
| 35 | + else: |
| 36 | + secret_message += char |
| 37 | +print("Encrypted:", secret_message) |
| 38 | + |
| 39 | +original_message = "" |
| 40 | +key = -key |
| 41 | + |
| 42 | +for char in secret_message: |
| 43 | + if char.isalpha(): |
| 44 | + char_code = ord(char) + key |
| 45 | + |
| 46 | + if char.isupper(): |
| 47 | + if char_code > ord("Z"): |
| 48 | + char_code -= 26 |
| 49 | + elif char_code < ord("A"): |
| 50 | + char_code += 26 |
| 51 | + else: |
| 52 | + if char_code > ord("z"): |
| 53 | + char_code -= 26 |
| 54 | + elif char_code < ord("a"): |
| 55 | + char_code += 26 |
| 56 | + original_message += chr(char_code) |
| 57 | + else: |
| 58 | + original_message += char |
| 59 | + |
| 60 | +print("Decrypted: ", original_message) |
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