I encrypted the text hello there with a 3x4 table with the key 2 1 3. I fill in the text into the table row by row and got the ciphertext eohehltrl_ex(reading by column). So if I were to decrypt this ciphertext into the plaintext what should I do? I made a 3x4 table again and filled it in row by row (according to online tutorials). However, I couldn't get the same text anymore. Do I fill in the ciphertext into the table by columns? I did my homework on decrypting a transpostion cipher(I fill in the ciphertext into the table by rows and I got the answer); however when I tried encrypting and decrypting my own text I couldn't do it.

Does anyone know what I am doing wrong?


1 Answer 1


For Decryption Process, use the reverse of encryption process. I think you are using a wrong table format. The table should be 4*3 instead of 3*4. Now, Write your encrypted text column by column(4 rows and 3 cols). It will be like this.

e h l

o l _

h t e

e r x

Now, Apply the decryption key of key 2 1 3. The decryption key will be the same.

2 1 3

| | |

2 1 3

Now, arrange the message in columns from above by making necessary transformations. The table will become,

h e l

l o _

t h e

r e x

Now, Read row by row. Your Message will be

hello there

Remember, For decryption, apply the same process for encryption in reverse order. Hope that helps. :)


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.