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Home > College Algebra > Ciphers > Running Key Cipher example
32. Running Key Cipher example ( 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 / Additive cipher / Shift 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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