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Adaptive Chosen-Plaintext

An adaptive chosen-plaintext attack allows the adversary to keep querying the encryption oracle even after seeing the challenge ciphertext (apart from the challenge plaintexts), making it the online form of IND-CPA.

Purpose

It captures the attacker’s ability to adapt strategy during the encryption game and is the default security model for public-key encryption.

Mechanism

The adversary first queries E_K(·) at will; after receiving the challenge C* = E_K(P_b) it may keep querying (but never P0 or P1) and finally outputs a guess of b. IND-CPA is exactly this model.

Use cases

  • Public-key encryption security definitions
  • Symmetric mode-of-operation evaluation
  • Online attack modeling

Related tools

AES Encryptor
Encrypt text or binary data with AES (CBC/GCM/ECB) using Web Crypto API. Free, private, and 100% client-side.
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RSA Tool
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References