In this discourse, I introduce the reader to the concept of Chosen-Plaintext Attacks, by first defining them and then introducing to some of the properties of encryption schemes secure against Chosen-Plaintext attacks. I then introduce the concept of pseudorandom functions and try to show, how pseudorandom functions or permutations help understanding CPA-security.
The discourse ends with constructing a CPA-secure encryption scheme based on pseudorandom permutations and a proposition that proves its correctness.
Inhaltsverzeichnis (Table of Contents)
- Flashback
- Chosen-Plaintext Attacks
- Example 1
- Example 2
- Pseudorandom Functions
- Pseudorandom Permutations
- Remark 1
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This discourse explores the concept of chosen-plaintext attacks (CPA) in cryptography. It examines the importance of designing secure encryption schemes that can withstand such attacks, where an adversary can influence the messages being encrypted. The discourse introduces pseudorandom functions and permutations as crucial elements in constructing CPA-secure encryption systems.
- Security against Chosen-Plaintext Attacks (CPA)
- Pseudorandom Functions
- Pseudorandom Permutations
- CPA-Secure Encryption Schemes
- Real-World Examples of Chosen-Plaintext Attacks
Zusammenfassung der Kapitel (Chapter Summaries)
The discourse begins with a flashback to previous security definitions where the adversary only passively eavesdrops on communication. It then introduces the concept of chosen-plaintext attacks, where the adversary can influence the messages being encrypted. Two real-world examples illustrate the potential impact of such attacks. The discourse then delves into the definition of CPA security and introduces pseudorandom functions as a tool for constructing CPA-secure encryption schemes. The final section explores pseudorandom permutations, a specific type of pseudorandom function that can be used to create secure encryption systems.
Schlüsselwörter (Keywords)
Chosen-plaintext attacks, CPA security, pseudorandom functions, pseudorandom permutations, encryption schemes, security definitions, eavesdropping, cryptography, real-world examples, World War II, Midway Island.
- Quote paper
- Matthias Himmelmann (Author), 2016, Security against Chosen-Plaintext Attacks, Munich, GRIN Verlag, https://www.grin.com/document/351992
