#### 📝Create a new article. 👨👩Create a biography. 🏭Create a company page. A cryptosystem would be more secure if a ciphertext letter could represent more than one plaintext letter. To give an **example** of this type of cryptosystem, called a polyalphabetic cryptosystem, we will generalize affine codes by using **matrices**. The idea works roughly the same as before; however, instead of encrypting one letter at a time we. In classical **cryptography**, messages are typically enciphered and transmitted from one person or group to some other person or group. In modern **cryptography**, there are many possible options for "sender" or "recipient". Some **examples**, for real crypto systems in the modern world, include: a computer program running on a local computer,.

**matrix**of order 3, the message is cut into pieces (WEL), (COM), (E), each of length 3, and converted into a sequence of

**row matrices**of numbers: [23 5 12],[3 15 13],[5 0 0]. Note that, we have included two zeros in the last

**row matrix.**. cyclic subgroup of a ﬁnite group G, one approach is to search for

**examples**of groups that can be eﬃciently represented and manipulated, and that possess cyclic subgroups with a DLP that seems hard. Various authors have suggested using a cyclic subgroup of a

**matrix**group in this context, but some basic linear algebra. Next, convert the keyword

**matrix**into a key

**matrix**by replacing the letters with corresponding numeric values. ... The second step is to convert the keyword

**matrix**. n Motivate the needs for

**cryptography**n Explain the role of

**cryptography**in everyday use n Symmetric

**Cryptography**: n Describe the main concept n Analyse some

**examples**n Discuss.