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?