In an adaptive chosen-ciphertext attack, the attacker can use the results from prior decryptions to inform their choices of which ciphertexts to have decrypted. In a non-adaptive attack, the attacker chooses the ciphertexts to have decrypted without seeing any of the resulting plaintexts.
the basic chosen-plaintext attack. The strongest formalized attack can have a polynomial access to the decryption oracle (except the challenge ciphertext c = E pk(m b)), adaptive chosen-ciphertext attacks [16], denoted CCA or CCA2 (by opposition to the earlier non-adaptive chosen-ciphertext attacks or lunchtime
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Mar 31, 2019 · Adaptive chosen-ciphertext Attack. A (full) adaptive chosen-ciphertext attack is an attack in which ciphertexts may be chosen adaptively before and after a challenge ciphertext is given to the ...

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  • Aug 31, 2016 · CSRF Tutorial - A Guide to Better Understand and Defend Against Cross-Site Request Forgery (CSRF) - Duration: 14:03. Fullstack Academy 45,254 views
  • A Practical Public Key Cryptosystem Provably Secure against Adaptive Chosen Ciphertext Attack. In this paper, we present and analyze a new public key cryptosystem that is provably secure against adaptive chosen ciphertext attack (as defined by Rackoff and Simon [20]).

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یک حمله متن رمزشده انتخابی انطباقی (به انگلیسی: Adaptive chosen-ciphertext attack) حمله ایست که متن‌های رمزشده ممکن است قبل و بعد یک چالش متن رمزشده که به یک مهاجم داده می‌شود، باشند، تنها با شرطی که چالش ...

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  • A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis where the cryptanalyst can gather information by obtaining the decryptions of chosen ciphertexts. From these pieces of information the adversary can attempt to recover the hidden secret key used for decryption.
  • adaptive chosen ciphertext attack. Definition. A cryptographic attack where the attacker repeatedly encrypts a selected plain text message and analyzes the resulting cipher-text to crack the cipher.

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Chosen-ciphertext attacks have implications for some self-synchronizing stream ciphers as well. Designers of tamper-resistant cryptographic smart An adaptive-chosen-ciphertext is the adaptive version of the above attack. A cryptanalyst can mount an attack of this type in a scenario in which he...

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Definition of Adaptive Chosen-Ciphertext Attack (CCA2): In CCA2, adversary knows the public key (through which she can only encrypt messages of her choice) and has access to decryption oracle even after the challenge ciphertext is given to her, but with the restriction that she cannot query challenge ciphertext to the decryption oracle.

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Adaptive Chosen Ciphertext Attacks. In 1998, Daniel Bleichenbacher described the first practical adaptive chosen ciphertext attack, against RSA-encrypted messages using the PKCS #1 v1 redundancy function (a redundancy function adds structure to an RSA-encrypted message, so it is...

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Adaptive-chosen ciphertext also mirrors its plaintext cousin: it begins with a chosen ciphertext attack in the first round. The cryptanalyst then adapts further rounds of decryption based on the previous round. Known Key. The term “known-key attack” is misleading, because if the cryptanalyst knows the key, the attack is over.

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Another variant (besides the ones explained by Henning) which I also would call chosen-ciphertext attack, is one where the attacker doesn't get the whole plaintext corresponding to its chosen ciphertext, but only a result like "valid" or "not valid", i.e. he has a validation oracle, with some useful definition of "valid".

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i.e., indistinguishability under adaptive chosen-ciphertext attacks (cf. Section 2). Usually, an (asymmetric) encryption scheme is proven secure by exhibiting a re-duction: if an adversary can break the IND-CCA2 security then the same adversary can solve a related problem assumed to be infeasible.

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