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Home > College Algebra > Ciphers > Running Key Cipher (encoder / decoder) example
32. Running Key Cipher example (encoder / decoder) ( Enter your problem )
( Enter your problem )
  1. Examples
 		Other related methods
  1. A1Z26 Cipher (Letter to number Cipher)
  2. ADFGVX Cipher
  3. ADFGX Cipher
  4. Affine Cipher
  5. Alberti Cipher
  6. Atbash Cipher
  7. Autokey Cipher / Autoclave Cipher
  8. Bacon Cipher
  9. Beaufort Cipher
  10. Bifid Cipher
  11. Caesar Cipher
  12. Chaocipher
  13. Columnar transposition Cipher
  14. Double Transposition Cipher
  15. Enigma machine Cipher
  16. Four Square Cipher
  17. Gronsfeld Cipher
  18. Hill Cipher
  19. Kamasutra Cipher | Vatsyayana Cipher
  20. Morse Code Translator
  21. Multiplicative Cipher | Decimation Cipher
  22. Nihilist Cipher
  23. Playfair Cipher
  24. Polybius Square Cipher
  25. Porta Cipher
  26. Rail fence Cipher
  27. ROT-5 Cipher
  28. ROT-13 Cipher
  29. ROT-18 Cipher
  30. ROT-47 Cipher
  31. ROT-N Cipher
  32. Running Key Cipher
  33. Substitution Cipher
  34. Tap code Cipher | Knock code Cipher
  35. Three Square Cipher
  36. Trifid Cipher
  37. Trithemius Cipher
  38. Two-square Cipher
  39. Vigenere Cipher
31. ROT-N Cipher
(Previous method)		33. Substitution Cipher
(Next method)

1. Examples


1. Running Key Cipher encoder

Text : ABCD efghi
Key : bcdefghijklm
Alphabet : abcdefghijklmnopqrstuvwxyz

Solution:
The Running key cipher is a polyalphabetic substitution cipher that encrypts a message using a long non-repeating keyword

Alphabet = abcdefghijklmnopqrstuvwxyz

Letterabcdefghijklmnopqrstuvwxyz
Number012345678910111213141516171819202122232425

Each letter is shifted down based on the key letter
PlaintextABCD efghi
Text Value
(2)		012345678
Keybcde fghij
Key Value
(4)		123456789
Addition
(2) + (4) Mod 26		1357911131517
CiphertextBDFH jlnpr

Plaintext : ABCD efghi
Key : bcdefghijklm
Ciphertext : BDFH jlnpr
2. Running Key Cipher encoder

Text : hello world
Key : bcdefghijklm
Alphabet : abcdefghijklmnopqrstuvwxyz

Solution:
The Running key cipher is a polyalphabetic substitution cipher that encrypts a message using a long non-repeating keyword

Alphabet = abcdefghijklmnopqrstuvwxyz

Letterabcdefghijklmnopqrstuvwxyz
Number012345678910111213141516171819202122232425

Each letter is shifted down based on the key letter
Plaintexthello world
Text Value
(2)		74111114221417113
Keybcdef ghijk
Key Value
(4)		12345678910
Addition
(2) + (4) Mod 26		8614151928=221252013
Ciphertextigopt cvzun

Plaintext : hello world
Key : bcdefghijklm
Ciphertext : igopt cvzun



This material is intended as a summary. Use your textbook for detail explanation.
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31. ROT-N Cipher
(Previous method)		33. Substitution Cipher
(Next method)


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