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[[File:Cyklometr.jpg|Cyklometr|thumb]] [[Image:Al-kindi-cryptanalysis.png|Al-kindi-cryptanalysis|thumb|left]] [[Image:Zimmermann-telegramm-offen.jpg|Zimmermann-telegramm-offen|thumb|left]] [[Image:TuringBombeBletchleyPark.jpg|TuringBombeBletchleyPark|thumb]] '''Cryptanalysis''' is the study of analyzing information systems in order to understand hidden aspects of the systems. It is used to breach cryptographic security systems and gain access to the contents of encrypted messages, even if the cryptographic key is unknown. In essence, cryptanalysis is the practice of decrypting a message without access to the key that was used to encrypt it. It is a core aspect of [[cryptography]], which more broadly encompasses the study and practice of techniques for secure communication in the presence of adversaries.

==History==
The history of cryptanalysis dates back to ancient times, with the earliest recorded instance of cryptanalysis attributed to the Arab mathematician [[Al-Kindi]] in the 9th century, who developed a method of decrypting encrypted messages by analyzing the frequency of letters in the Arabic language. This technique, known as [[frequency analysis]], became a fundamental tool in breaking classical ciphers.

Throughout history, the art and science of cryptanalysis have evolved significantly. During World War II, cryptanalysis reached a pivotal point with the efforts of the [[Allies]] to decrypt the [[Enigma machine]] used by the Axis powers. The work of cryptanalysts like [[Alan Turing]] at Bletchley Park in England was crucial in the development of early computers and had a profound impact on the outcome of the war.

==Techniques==
Cryptanalysis employs a variety of techniques to achieve its goals, including but not limited to:

- '''Frequency analysis''': Analyzing the frequency of letters or groups of letters in a piece of ciphertext.
- '''Known-plaintext attack''': Using a segment of known plaintext and its corresponding ciphertext to decrypt the rest of the message.
- '''Differential cryptanalysis''': A method that examines how differences in input can affect the resultant difference at the output.
- '''Side-channel attacks''': Exploiting physical implementations of a cryptosystem, such as timing information, power consumption, electromagnetic leaks, or even sound to break the system.

==Modern Cryptanalysis==
In the modern era, cryptanalysis has grown more complex with the advent of sophisticated cryptographic algorithms designed to secure digital communications and transactions. The introduction of [[public-key cryptography]] in the 1970s, for instance, presented new challenges and opportunities for cryptanalysts. Today, cryptanalysis involves a deep understanding of mathematics, computer science, and even quantum computing, as researchers explore the potential of quantum computers to break current cryptographic algorithms.

==Ethical and Legal Considerations==
The practice of cryptanalysis is not without its ethical and legal considerations. While it can be used for legitimate purposes, such as testing the security of cryptographic systems, it can also be employed for malicious purposes, including espionage, identity theft, and unauthorized access to private communications. Consequently, the field operates within a complex legal and ethical framework, varying significantly across different jurisdictions.

==See Also==
- [[Cryptography]]
- [[Cipher]]
- [[Encryption]]
- [[Alan Turing]]
- [[Enigma machine]]

[[Category:Cryptography]]
[[Category:Computer security]]
[[Category:Mathematics]]

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Cryptanalysis - Revision history

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