Hello, I am having trouble with the following problem in my Cryprography class,

Question

Hello, I am having trouble with the following problem in my Cryprography class, can you help me?

2. 130 pts] Suppose you, as an attacker, observe the following 32-byte ciphertext CI (in hex) 4D 11 30 28 13 C7 8C EB 31 21 20 B0 70 B4 C3 B4 FA 3A 20 12 02 13 1CFD C5 44 07 25 D3 96 1F 74 and the following 32-byte ciphertext C2 (also in hex) 50 15 30 30 56 E6 91 BF 22 6E 22 B0 7D EO CB B5 FO 6E 3A 22 15 0D 19 E5 8A 40 1A 31 D1 8D 03 74 Suppose you know these ciphertexts were generated using CTR mode with the same nonce. You also know that the plaintext P/ corresponding to Cl is 49 6C 69 6B 65 49 6E 74 72 6F 64 75 63 74 69 6F 6E 74 6F 43 72 79 70 74 6F 67 72 61 70 68 79 21 What information, if any, can you infer about the plaintext P2 corresponding to C2?

Explanation / Answer

ANSWER::

Ciphertext-only Attack

In the ciphertext-only attack, the cryptanalyst can only gain access to code or ciphertexts.

Known-plaintext Attack

In the known-plaintext attack, the individual or group conducting the attack only has access to a group of ciphertexts where he or she knows the corresponding plaintext.

Chosen-plaintext Attack:

In the Chosen-plaintext attack, the attacker is only able to obtain the ciphertexts that correspond to a random or arbitrary set of plaintexts of his or her choosing.

Batch Chosen-plaintext Attack

In the Batch Chosen-plaintext attack, the attacker is able to choose all of the plaintexts prior to any of them being encrypted.

Adaptive Chosen-Plaintext Attack

In the Adaptive Chosen-Plaintext attack, the cryptanalyst is able to create a set or series of interactive queries. During these queries, he or she is able to choose subsequent plaintexts that are based on the information from the previous encryptions.

Chosen-Ciphertext Attack

During the Chosen-Ciphertext attack, the person or group conducting the attack is able to obtain the plaintexts that correspond to a random set of ciphertexts of their choosing.

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.