The two things that you are asking about are types of encryption cyphers.

In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. A study of these techniques enables us to illustrate the basic approaches to symmetric encryption used today and the types of cryptanalytic attacks that must be anticipated. In substitution cipher we replace each letter of the plaintext with another letter, symbol, or number; for the decryption, the reverse substitution has to be performed.

Monoalphabetic cipher is a substitution cipher in which for a given key, the cipher alphabet for each plain alphabet is fixed throughout the encryption process.

This paper describes about some of the substitution and transposition encryption techniques which are already available. Transposition cipher technique does not substitute one symbol for another instead it changes the location of the symbol. Both Monoalphabetic Substitution Ciphers and Simple Transposition Ciphers are susceptible to different means of cryptanalysis, and neither has been secure for quite some time. 2) How can the Security of Transposition Ciphers be increased? The course describes substitution and transposition techniques, which were the bases for classical cryptography when the message is encoded in natural language such as English.

SUBTITUTION TECHNIQUES • The two basic building block of all the encryption techniques are substitution and transposition . The substitution and transposition techniques are used for converting a plaintext into ciphertext, where substitution technique replaces the characters whereas transposition technique rearranges the characters to form a ciphertext. Even more so, with the invention of the computer, these types of codes have fallen, and are not used for any truly important pieces of information. In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext constitutes a permutation of the plaintext. So read on the full article to know the main difference as well as example of these ciphers. However, a substitution cipher is simpler and easy to break. Difference Between Substitution and Transposition Cipher. Difference Between Substitution and Transposition Cipher. Many such techniques have come into the picture till date such as ceaser cipher, vernam cipher, vigenere cipher technique etc. In conclusion: the transposition ciphers don't offer any security. Nihad Ahmad Hassan, Rami Hijazi, in Data Hiding Techniques in Windows OS, 2017.

That is, the order of the units is changed (the plaintext is reordered). The Rail Fence is the simplest example of a class of transposition ciphers called "Route Ciphers". The two basic building blocks of all encryption techniques: substitution and transposition. In substitution cipher we replace each letter of the plaintext with another letter, symbol, or number; for the decryption, the reverse substitution has to be performed. Transposition cipher, simple data encryption scheme in which plaintext characters are shifted in some regular pattern to form ciphertext. In general cryptographic encryption techniques are classified as classical encryption techniques and modern cryptographic techniques based on the periods that are developed/used . Characterizing Cryptographic Systems • Operations used for encryption: – Substitution replace one element in plaintext with another – Transposition re-arrange elements – Product systems multiple stages of substitutions and transpositions • Number of keys used: – Symmetric sender/receiver use same key (single-key, secret-key, Substitution Techniques 3. We examine these in the next two sections. We examine these in the next two sections. Nihad Ahmad Hassan, Rami Hijazi, in Data Hiding Techniques in Windows OS, 2017. Transposition Techniques are based on the permutation of the plain-text instead of substitution. For example, a popular schoolboy cipher is the “rail

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