100% PASS QUIZ 2025 COPYRIGHT: COPYRIGHT SECURITY PROFESSIONAL (COPYRIGHT)–RELIABLE LATEST BRAINDUMPS PPT

100% Pass Quiz 2025 copyright: copyright Security Professional (copyright)–Reliable Latest Braindumps Ppt

100% Pass Quiz 2025 copyright: copyright Security Professional (copyright)–Reliable Latest Braindumps Ppt

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ISC copyright (copyright Security Professional) Certification Exam is one of the most recognized and respected certifications in the information security industry. It is designed to test the knowledge and skills of security professionals in various domains related to information security. copyright Exam is vendor-neutral and covers a wide range of topics, from security risk management to cryptography.

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The copyright certification is highly regarded in the information security industry and is recognized by many organizations worldwide. It is considered a benchmark for information security professionals and is often required for senior-level information security positions. Obtaining the copyright Certification demonstrates not only a high level of technical expertise but also a commitment to the information security profession.

ISC copyright Security Professional (copyright) Sample Questions (Q483-Q488):

NEW QUESTION # 483
What uses a key of the same length as the message where each bit or character from the plaintext is encrypted by a modular addition?

  • A. Cipher block chaining
  • B. Running key cipher
  • C. Steganography
  • D. One-time pad

Answer: D

Explanation:
In cryptography, the one-time pad (OTP) is a type of encryption that is impossible to crack if used correctly. Each bit or character from the plaintext is encrypted by a modular addition with a bit or character from a secret random key (or pad) of the same length as the plaintext, resulting in a ciphertext. If the key is truly random, at least as long as the plaintext, never reused in whole or part, and kept secret, the ciphertext will be impossible to decrypt or break without knowing the key. It has also been proven that any cipher with the perfect secrecy property must use keys with effectively the same requirements as OTP keys. However, practical problems have prevented one-time pads from being widely used.
First described by Frank Miller in 1882, the one-time pad was re-invented in 1917 and patented a couple of years later. It is derived from the Vernam cipher, named after Gilbert Vernam, one of its inventors. Vernam's system was a cipher that combined a message with a key read from a punched tape. In its original form, Vernam's system was vulnerable because the key tape was a loop, which was reused whenever the loop made a full cycle. One-time use came a little later when Joseph Mauborgne recognized that if the key tape were totally random, cryptanalysis would be impossible.
The "pad" part of the name comes from early implementations where the key material was distributed as a pad of paper, so the top sheet could be easily torn off and destroyed after use. For easy concealment, the pad was sometimes reduced to such a small size that a powerful magnifying glass was required to use it. Photos show captured KGB pads that fit in the palm of one's hand, or in a walnut shell. To increase security, one-time pads were sometimes printed onto sheets of highly flammable nitrocellulose so they could be quickly burned.
The following are incorrect answers:
A running key cipher uses articles in the physical world rather than an electronic algorithm. In
classical cryptography, the running key cipher is a type of polyalphabetic substitution cipher in
which a text, typically from a book, is used to provide a very long keystream. Usually, the book to
be used would be agreed ahead of time, while the passage to use would be chosen randomly for
each message and secretly indicated somewhere in the message.
The Running Key cipher has the same internal workings as the Vigenere cipher. The difference
lies in how the key is chosen; the Vigenere cipher uses a short key that repeats, whereas the
running key cipher uses a long key such as an excerpt from a book. This means the key does not
repeat, making cryptanalysis more difficult. The cipher can still be broken though, as there are
statistical patterns in both the key and the plaintext which can be exploited.
Steganography is a method where the very existence of the message is concealed. It is the art
and science of encoding hidden messages in such a way that no one, apart from the sender and
intended recipient, suspects the existence of the message. it is sometimes referred to as Hiding in
Plain Sight.
Cipher block chaining is a DES operating mode. IBM invented the cipher-block chaining (CBC)
mode of operation in 1976. In CBC mode, each block of plaintext is XORed with the previous
ciphertext block before being encrypted. This way, each ciphertext block depends on all plaintext
blocks processed up to that point. To make each message unique, an initialization vector must be
used in the first block.
Reference(s) used for this question:
HARRIS, Shon, All-In-One copyright Certification Exam Guide, McGraw-Hill/Osborne, 2002, chapter
8: Cryptography (page 555). and http://en.wikipedia.org/wiki/One-time_pad http://en.wikipedia.org/wiki/Running_key_cipher http://en.wikipedia.org/wiki/Cipher_block_chaining#Cipher-block_chaining_.28CBC.29


NEW QUESTION # 484
Which of the following is an example of a Time of Check/Time of Use (TOQTOU) problem?

  • A. A user session is not validated until after the log on.
  • B. A user whose profile has been revoked logs on using the password of a valid user of the system.
  • C. A user logs on with a valid profile which is revoked without termination of the session.
  • D. A user session is terminated immediately after the user profile is revoked.

Answer: A


NEW QUESTION # 485
What is the main objective of proper separation of duties?

  • A. To ensure that audit trails are not tampered with
  • B. To ensure access controls are in place
  • C. To ensure that no single individual can compromise a system
  • D. To prevent employees from disclosing sensitive information

Answer: C

Explanation:
"Separation of duties (also called segregation of duties) assigns parts of tasks to different personnel. Thus if no single person has total control of the system's security mechanisms, the theory is that no single person can completely compromise the system."
Pg. 303 Krutz: The copyright Prep Guide: Gold Edition


NEW QUESTION # 486
What is the most secure way to dispose of information on a CD-ROM?

  • A. Physical destruction
  • B. Degaussing
  • C. Physical damage
  • D. Sanitizing

Answer: A

Explanation:
Explanation/Reference:
Explanation:
The information stored on a CDROM is not in electro-magnetic format, so a degausser would be ineffective.
The only way to dispose of information on a CD-ROM is to physically destroy the CD-ROM.
Incorrect Answers:
A: You cannot sanitize read-only media such as a CDROM.
B: Physical damage is not the MOST secure way to dispose of information on a CD-ROM. Data could still be recovered from the undamaged part of the CD-ROM. Only complete destruction of the CD-ROM will suffice.
C: Degaussing does not work on read-only media such as a CDROM.


NEW QUESTION # 487
Which one of the following operates at the session, transport, or network layer of the Open
System Interconnection (OSI) model?

  • A. Integrity checking software
  • B. Data at rest encryption
  • C. Cyclic redundancy check (CRC)
  • D. Configuration Management

Answer: C


NEW QUESTION # 488
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