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Suppose the attacker knows that a 16-byte plaintext is the string (hexadecimal representation): (b1,b2, b3, b4, $5,0,0,0, 0,0,0,0, 2, 2, 2, 2) The attacker does not know the value of the bi's. The attacker has access to the padding oracle and has the ciphertext of the above plaintext. Let v be the one-block IV and c be the one-block ciphertext. The attacker wants to send a query (w, c) to the oracle where: w = v(a₁, A2, A3, A4, A5, A6, A7, A8, A9, 10, 11, 12, 13, 14, 15, 16) so that the oracle outputs "Correctly padded" iff bs=1. 4. For the above method to work, what is the value of a10? A. B. OA C. D. OC E. . For the above method to work, what is the value of a16? B. OB D. OE A. نین نے C. E. نیا ن ہے ؟ . For the above method to work, what is the value of as? B. OB D. OD A. 02 OB any of the above will work. ند ن ہ ہ OA OC any of the above will work. A. . For the above method to work, what is the value of a₁? B. OB D. OD OA OC any of the above will work. 02 OC any of the above will work.

Suppose the attacker knows that a 16-byte plaintext is the string (hexadecimal representation): (b1,b2, b3, b4, $5,0,0,0, 0,0,0,0, 2, 2, 2, 2) The attacker does not know the value of the bi's. The attacker has access to the padding oracle and has the ciphertext of the above plaintext. Let v be the one-block IV and c be the one-block ciphertext. The attacker wants to send a query (w, c) to the oracle where: w = v(a₁, A2, A3, A4, A5, A6, A7, A8, A9, 10, 11, 12, 13, 14, 15, 16) so that the oracle outputs "Correctly padded" iff bs=1. 4. For the above method to work, what is the value of a10? A. B. OA C. D. OC E. . For the above method to work, what is the value of a16? B. OB D. OE A. نین نے C. E. نیا ن ہے ؟ . For the above method to work, what is the value of as? B. OB D. OD A. 02 OB any of the above will work. ند ن ہ ہ OA OC any of the above will work. A. . For the above method to work, what is the value of a₁? B. OB D. OD OA OC any of the above will work. 02 OC any of the above will work.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Suppose the attacker knows that a 16-byte plaintext is the string (hexadecimal representation): (b1,b2, b3, b4, b5,0,0,0, 0,0,0,0, 2, 2, 2, 2) The attacker does not know the value of the bi's. The attacker has access to the padding oracle and has the ciphertext of the above plaintext. Let v be the one-block IV and c be the one-block ciphertext. The attacker wants to send a query (w, c) to the oracle where: w = v(a1, A2, A3, A4, A5, A6, A7, A8, A9, a10, 11, 12, 13, 14, 15, 16) so that the oracle outputs "Correctly padded" iff bs=1. 14. For the above method to work, what is the value of a10? A. B. OA C. D. OC E. 15. For the above method to work, what is the value of a16? A. B. OB C. D. OE E. 02 OB any of the above will work. 16. For the above method to work, what is the value of as? A. B. OB C. D. OD E. نین ہے ۔ OA OC any of the above will work. A. 17. For the above method to work, what is the value of a₁? B. OB D. OD OA OC any of the above will work. 02 OC any of the above will work.
Transcribed Image Text:Suppose the attacker knows that a 16-byte plaintext is the string (hexadecimal representation): (b1,b2, b3, b4, b5,0,0,0, 0,0,0,0, 2, 2, 2, 2) The attacker does not know the value of the bi's. The attacker has access to the padding oracle and has the ciphertext of the above plaintext. Let v be the one-block IV and c be the one-block ciphertext. The attacker wants to send a query (w, c) to the oracle where: w = v(a1, A2, A3, A4, A5, A6, A7, A8, A9, a10, 11, 12, 13, 14, 15, 16) so that the oracle outputs "Correctly padded" iff bs=1. 14. For the above method to work, what is the value of a10? A. B. OA C. D. OC E. 15. For the above method to work, what is the value of a16? A. B. OB C. D. OE E. 02 OB any of the above will work. 16. For the above method to work, what is the value of as? A. B. OB C. D. OD E. نین ہے ۔ OA OC any of the above will work. A. 17. For the above method to work, what is the value of a₁? B. OB D. OD OA OC any of the above will work. 02 OC any of the above will work.
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