Which attack involves the attacker generating a chosen plaintext and obtaining the corresponding ciphertext under the same key?

Which attack involves the attacker generating a chosen plaintext and obtaining the corresponding ciphertext under the same key?

• A. Known Plaintext Attack
• B. Chosen Plaintext Attack
• C. Ciphertext-Only Attack
• D. Brute Force Attack

Answer: (B)

In a chosen-plaintext attack, the attacker can select plaintexts and obtain their ciphertexts under the same cryptographic key. This access to an encryption oracle lets the attacker study how the cipher maps specific inputs to outputs, revealing weaknesses that could lead to deducing the key or breaking the scheme. This scenario is distinct from ciphertext-only (only ciphertexts are available), known-plaintext (some plaintext–ciphertext pairs are available but not chosen by the attacker), or brute force (trying keys without interacting with the encryption process). The defining feature is the ability to choose the plaintexts and see the resulting ciphertexts under the same key.

In a chosen-plaintext attack, the attacker can select plaintexts and obtain their ciphertexts under the same cryptographic key. This access to an encryption oracle lets the attacker study how the cipher maps specific inputs to outputs, revealing weaknesses that could lead to deducing the key or breaking the scheme. This scenario is distinct from ciphertext-only (only ciphertexts are available), known-plaintext (some plaintext–ciphertext pairs are available but not chosen by the attacker), or brute force (trying keys without interacting with the encryption process). The defining feature is the ability to choose the plaintexts and see the resulting ciphertexts under the same key.