What is the difference between substitution and transposition encryption

Everyone likes safety. The safety of confidential information is always of special concern. Therefore, information Your email address will not be published. Let us know what you have to say:. Save my name, email, and website in this browser for the next time I comment. Define your site main menu. Substitution and Transposition Ciphers. Follow Us! Rate this article:. Alterations The identity of the character is changed while its position remains unchanged. The position of the character is changed in spite of its identity.

Demerit The letter with the low frequency can discern the plaintext. Keys near to the correct key can disclose the plaintext. Substitution technique involves the replacement of the letters by other letters and symbols. In a more straightforward way, the characters of plaintext are replaced, and other substitute characters, numbers and symbols are used at their place. Caesar cipher uses the substitution technique where the alphabets are replaced with the other alphabets which are three position forward of the line.

Julius Caesar devised this technique, and it was named after him as the Caesar Cipher. There are several substitution techniques are developed after caesar cipher such as Mono-alphabetic cipher, Homophobic substitution cipher, Polygram substitution cipher, Polyalphabetic substitution cipher, Playfair cipher and Hill cipher. The Caesar cipher was the weakest cipher, although the evolution of the techniques made the new version stronger.

The limitation of the substitution technique is that it is very predictable if the translation table is known the substitution can be broken. In transposition technique , the identity of the characters remains unchanged, but their positions are changed to create the ciphertext.

The transposition technique is illustrated in the example given below. When this approach of polyalphabetic substitution is carried to its limit, it results in onetime keys or pads. Transposition cipher is a method of encryption by which the positions held by units of plaintext which are commonly characters or group of characters are shifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext.

That is, the order of the units is changed the plaintext is reordered. Viva Differences. What Is Substitution Cipher Technique? Comments are closed.