# Cryptanalysis case study in ooad

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We recently migrated our community to a new web platform and regretably the content for this page needed to be programmatically ported from its previous wiki page. Cryptanalysis is a process of finding weaknesses in cryptographic algorithms and using these weaknesses to decipher the ciphertext without knowing the secret key instance deduction. Sometimes the weakness is not in the cryptographic algorithm itself, but rather in how it is applied that makes cryptanalysis successful. An attacker may have other goals as well, such as:. The goal of the attacker performing cryptanalysis will depend on the specific needs of the attacker in a given attack context.

## OOAD - Object Oriented Analysis - Tutorialspoint

In addition to mathematical analysis of cryptographic algorithms, cryptanalysis includes the study of side-channel attacks that do not target weaknesses in the cryptographic algorithms themselves, but instead exploit weaknesses in their implementation. Even though the goal has been the same, the methods and techniques of cryptanalysis have changed drastically through the history of cryptography, adapting to increasing cryptographic complexity, ranging from the pen-and-paper methods of the past, through machines like the British Bombes and Colossus computers at Bletchley Park in World War II , to the mathematically advanced computerized schemes of the present. Methods for breaking modern cryptosystems often involve solving carefully constructed problems in pure mathematics , the best-known being integer factorization. Given some encrypted data " ciphertext " , the goal of the cryptanalyst is to gain as much information as possible about the original, unencrypted data " plaintext ". Attacks can be classified based on what type of information the attacker has available.

### Cryptanalysiss

In the system analysis or object-oriented analysis phase of software development, the system requirements are determined, the classes are identified and the relationships among classes are identified. The three analysis techniques that are used in conjunction with each other for object-oriented analysis are object modelling, dynamic modelling, and functional modelling. Object modelling develops the static structure of the software system in terms of objects. It identifies the objects, the classes into which the objects can be grouped into and the relationships between the objects.
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