Code for Computer Science

Cloud Computing includes Several elements like: Clients Datacenters Distributed servers Each component has a Purpose and plays a specific role in delivering a functional Cloud-based application.  1. Clients: C lients are typically computers. Clients are devices that end-users interact with to manage their information on Cloud.  For example Laptops, Mobiles Phones,  Tablets  Note: because of their mobility they are big drivers for Cloud computing.  2. Datacenter means the Collection of Servers. W here the application to which you subscribe is housed. A growing trend in the IT world is VIRTUALIZING servers. Multiple Virtual servers running on one physical server. 3. Distributed servers mean Large networks have Multiple servers. Servers are in geographically disparate locations. It provides more flexibility and security to the service providers.  For example, Amazon has its own Cloud solution in servers all over the world.  Services in Cloud Computin g is the concept of being able to use

  Monoalphabetic Substitution Cipher, also known as a simple substitution cipher, relies (depends) on a fixed replacement structure. That is substitution is fixed for each letter of the alphabet.  A simple example is where each letter is encrypted as the next letter in the alphabet: "a simple message" becomes "B TJNQMF NFTTBHF". Each letter can be encrypted to any symbol [&,%,?,/,*,{},@,~,+,-] not just another letter. 1.) Additive Cipher The Simplest Monoalphabetic cipher is an Additive cipher. This cipher is sometimes called Shift Cipher. When the Cipher is Additive, the Plain Text, Cipher Text and key are integers in Z(26). For Encryption: C = (p + k) mod 26 For Decryption: P = (c - k) mod 26 Where, C = Cipher Text                   P = Plain Text                   k = Key  The secret key between Alice and Bob is also an integer value. The encryption Algorithm adds the key to the Plain text character. Decryption Algorithm Subtract the key from the ciphertext c