Ciphertext is an algorithm method that replaces plaintext with substitutions:
The types of ciphertext are:
transposition ciphers: This rearranges the order of the letters for a specific algorithm while keeping the letters the same. For example, a message read horizontally could be written vertically to convert it from a simple columnar transposition cipher to a ciphertext
Substitution ciphers: The characters, character blocks, and orbits are replaced by similar ones to form a ciphertext. It could be mono-alphabetic or poly-alphabetic depending upon the number of letters being replaced.
Polygraphic ciphers: This substitutes groups of letters by replacing each letter with the other letter. This makes the frequency analysis attacks difficult as the frequency of the distribution of letters is masked.
Permutation ciphers: This helps with constituting the ciphertext into a permutation of the plaintext by shifting the positions of the plaintext into the regular system.
Ciphers that are used in securing online communications are called symmetric ciphers. Many
Symmetric ciphers help to protect the data in many e-commerce services, WiFis, and mobile telephones.
Caesar cipher is a method in which messages are encoded using the
For example, if the shift is 3, then A would become D, B would be E, C would become F, and so on until the end of the alphabet when the cycle starts again with X becoming A, Y becoming B, and Z becoming C.
View all Courses