Legit CISSP Exam Download

The person in the organization who is accountable for the classification of data information assets is the data owner. The data owner is the person or entity that has the authority and responsibility for the creation, collection, processing, and disposal of a set of data. The data owner is also responsible for defining the purpose, value, and classification of the data, as well as the security requirements and controls for the data. The data owner should be able to determine the impact of the data on the mission of the organization, which means assessing the potential consequences of losing, compromising, or disclosing the data. The impact of the data on the mission of the organization is one of the main criteria for data classification, which helps to establish the appropriate level of protection and handling for the data. The data owner should also ensure that the data is properly labeled, stored, accessed, shared, and destroyed according to the data classification policy and procedures.

The other options are not the persons in the organization who are accountable for the classification of data information assets, but rather persons who have other roles or functions related to data management. The data architect is the person or entity that designs and models the structure, format, and relationships of the data, as well as the data standards, specifications, and lifecycle. The data architect supports the data owner by providing technical guidance and expertise on the data architecture and quality. The Chief Information Security Officer (CISO) is the person or entity that oversees the security strategy, policies, and programs of the organization, as well as the security performance and incidents. The CISO supports the data owner by providing security leadership and governance, as well as ensuring the compliance and alignment of the data security with the organizational objectives and regulations. The Chief Information Officer (CIO) is the person or entity that manages the information technology (IT) resources and services of the organization, as well as the IT strategy and innovation. The CIO supports the data owner by providing IT management and direction, as well as ensuring the availability, reliability, and scalability of the IT infrastructure and applications.

The use of private and public encryption keys is fundamental in the implementation of Secure Sockets Layer (SSL). SSL is a protocol that provides secure communication over the Internet by using public key cryptography and digital certificates. SSL works as follows:

• The client initiates a connection to the server and requests its digital certificate, which contains its public key and identity information.
• The server sends its digital certificate to the client, and optionally requests the client’s digital certificate as well.
• The client verifies the server’s digital certificate with a trusted third party, such as a certificate authority (CA), and optionally sends its own digital certificate to the server.
• The server verifies the client’s digital certificate with a trusted third party, if applicable.
• The client and the server use the Diffie-Hellman algorithm to generate a shared secret key, which is used to encrypt and decrypt the data exchanged between them.
• The client and the server use the shared secret key and a symmetric encryption algorithm, such as Advanced Encryption Standard (AES), to establish a secure session and communicate confidentially and reliably.

The use of private and public encryption keys is fundamental in the implementation of SSL because it enables the authentication of the parties, the establishment of the shared secret key, and the protection of the data from eavesdropping, tampering, and replay attacks.

The other options are not protocols or algorithms that use private and public encryption keys in their implementation. Diffie-Hellman algorithm is a method for generating a shared secret key between two parties, but it does not use private and public encryption keys, but rather public and private parameters. Advanced Encryption Standard (AES) is a symmetric encryption algorithm that uses the same key for encryption and decryption, but it does not use private and public encryption keys, but rather a single secret key. Message Digest 5 (MD5) is a hash function that produces a fixed-length output from a variable-length input, but it does not use private and public encryption keys, but rather a one-way mathematical function.

Compressing the data before encryption is a technique that can be used to make an encryption scheme more resistant to a known plaintext attack. A known plaintext attack is a type of cryptanalysis where the attacker has access to some pairs of plaintext and ciphertext encrypted with the same key, and tries to recover the key or decrypt other ciphertexts. A known plaintext attack can exploit the statistical properties or patterns of the plaintext or the ciphertext to reduce the search space or guess the key. Compressing the data before encryption can reduce the redundancy and increase the entropy of the plaintext, making it harder for the attacker to find any correlations or similarities between the plaintext and the ciphertext. Compressing the data before encryption can also reduce the size of the plaintext, making it more difficult for the attacker to obtain enough plaintext-ciphertext pairs for a successful attack.

The other options are not techniques that can be used to make an encryption scheme more resistant to a known plaintext attack, but rather techniques that can introduce other security issues or inefficiencies. Hashing the data before encryption is not a useful technique, as hashing is a one-way function that cannot be reversed, and the encrypted hash cannot be decrypted to recover the original data. Hashing the data after encryption is also not a useful technique, as hashing does not add any security to the encryption, and the hash can be easily computed by anyone who has access to the ciphertext. Compressing the data after encryption is not a recommended technique, as compression algorithms usually work better on uncompressed data, and compressing the ciphertext can introduce errors or vulnerabilities that can compromise the encryption.

The security service that is served by the process of encrypting plaintext with the sender’s private key and decrypting ciphertext with the sender’s public key is identification. Identification is the process of verifying the identity of a person or entity that claims to be who or what it is. Identification can be achieved by using public key cryptography and digital signatures, which are based on the process of encrypting plaintext with the sender’s private key and decrypting ciphertext with the sender’s public key. This process works as follows:

• The sender has a pair of public and private keys, and the public key is shared with the receiver in advance.
• The sender encrypts the plaintext message with its private key, which produces a ciphertext that is also a digital signature of the message.
• The sender sends the ciphertext to the receiver, along with the plaintext message or a hash of the message.
• The receiver decrypts the ciphertext with the sender’s public key, which produces the same plaintext message or hash of the message.
• The receiver compares the decrypted message or hash with the original message or hash, and verifies the identity of the sender if they match.

The process of encrypting plaintext with the sender’s private key and decrypting ciphertext with the sender’s public key serves identification because it ensures that only the sender can produce a valid ciphertext that can be decrypted by the receiver, and that the receiver can verify the sender’s identity by using the sender’s public key. This process also provides non-repudiation, which means that the sender cannot deny sending the message or the receiver cannot deny receiving the message, as the ciphertext serves as a proof of origin and delivery.

The other options are not the security services that are served by the process of encrypting plaintext with the sender’s private key and decrypting ciphertext with the sender’s public key. Confidentiality is the process of ensuring that the message is only readable by the intended parties, and it is achieved by encrypting plaintext with the receiver’s public key and decrypting ciphertext with the receiver’s private key. Integrity is the process of ensuring that the message is not modified or corrupted during transmission, and it is achieved by using hash functions and message authentication codes. Availability is the process of ensuring that the message is accessible and usable by the authorized parties, and it is achieved by using redundancy, backup, and recovery mechanisms.