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Exam CISSP Topic 2 Question 53 Discussion
Actual exam question for ISC's CISSP exam
Question #: 53
Topic #: 2
Question #: 53
Topic #: 2
If the application of a hash function results in an m-bit fixed length
output, an attack on the hash function that attempts to achieve a
collision after 2 m/2 possible trial input values is called a(n):
output, an attack on the hash function that attempts to achieve a
collision after 2 m/2 possible trial input values is called a(n):
Suggested Answer: A Vote an answer
This problem is analogous to asking the question How many
people must be in a room for the probability of two people having
the same birthday to be equal to 50%? The answer is 23. Thus,
trying 2m/2 possible trial inputs to a hash function gives a 50%
chance of finding two inputs that have the same hash value. Answer
a, describes an attack in which the attacker can choose the plaintext
to be encrypted and can modify his/her choice based on the results
of a previous encryption.
* Answer the chosen-cipher text attack is where the attacker can select different ciphertexts to be decrypted and has the decrypted plaintext available. This attack is used to determine the key or keys being used. Answer d is an attack against double encryption. This approach shows that for a key length of k
bits, a chosen-plaintext attack could find the key after 2k+1 trials
instead of 22k attempts. In this attack on double encryption, one
encrypts from one end, decrypts from the other and compares the
results in-the-middle.
people must be in a room for the probability of two people having
the same birthday to be equal to 50%? The answer is 23. Thus,
trying 2m/2 possible trial inputs to a hash function gives a 50%
chance of finding two inputs that have the same hash value. Answer
a, describes an attack in which the attacker can choose the plaintext
to be encrypted and can modify his/her choice based on the results
of a previous encryption.
* Answer the chosen-cipher text attack is where the attacker can select different ciphertexts to be decrypted and has the decrypted plaintext available. This attack is used to determine the key or keys being used. Answer d is an attack against double encryption. This approach shows that for a key length of k
bits, a chosen-plaintext attack could find the key after 2k+1 trials
instead of 22k attempts. In this attack on double encryption, one
encrypts from one end, decrypts from the other and compares the
results in-the-middle.
by Dennis at Jan 12, 2024, 03:17 AM
Here are all the actual test exam dumps for IT exams. Most people prepare for the actual exams with our test dumps to pass their exams. So it's critical to choose and actual test pdf to succeed.
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