1. Trithemius Cipher encoder
Text : ABCD efghi
Alphabet : abcdefghijklmnopqrstuvwxyz
Shift order : Ascending (0,1,2,3,...)
Initial Shift + 0Solution:The Trithemius cipher encrypts a message using successive shifts, first letter shifts by 0, second shifts by 1, third shifts by 2 and so on
Alphabet = abcdefghijklmnopqrstuvwxyz
| Letter | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z |
| Number | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| Plaintext | A | B | C | D | | e | f | g | h | i |
Text Value
(2) | 0 | 1 | 2 | 3 | | 4 | 5 | 6 | 7 | 8 |
Shift
(3) | 0 | 1 | 2 | 3 | | 4 | 5 | 6 | 7 | 8 |
Addition
(2) + (3) Mod 26 | 0 | 2 | 4 | 6 | | 8 | 10 | 12 | 14 | 16 |
| Ciphertext | A | C | E | G | | i | k | m | o | q |
| Plaintext | : ABCD efghi |
| Ciphertext | : ACEG ikmoq |
2. Trithemius Cipher encoder
Text : hello world
Alphabet : abcdefghijklmnopqrstuvwxyz
Shift order : Ascending (0,1,2,3,...)
Initial Shift + 0Solution:The Trithemius cipher encrypts a message using successive shifts, first letter shifts by 0, second shifts by 1, third shifts by 2 and so on
Alphabet = abcdefghijklmnopqrstuvwxyz
| Letter | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z |
| Number | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| Plaintext | h | e | l | l | o | | w | o | r | l | d |
Text Value
(2) | 7 | 4 | 11 | 11 | 14 | | 22 | 14 | 17 | 11 | 3 |
Shift
(3) | 0 | 1 | 2 | 3 | 4 | | 5 | 6 | 7 | 8 | 9 |
Addition
(2) + (3) Mod 26 | 7 | 5 | 13 | 14 | 18 | | 27=1 | 20 | 24 | 19 | 12 |
| Ciphertext | h | f | n | o | s | | b | u | y | t | m |
| Plaintext | : hello world |
| Ciphertext | : hfnos buytm |
This material is intended as a summary. Use your textbook for detail explanation.
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