Logical security includes access control, encryption, security management, and user identity authent

Summary. One-time code card technology. This technique is arguably the most perfect and the most difficult to apply in practice.

Some random digital passwords are printed on the card in advance, and the user takes out one to use when logging in, and the password will be invalid if used once, and the next login must use another one, and wait until all the passwords on a card are used up, and then go to change the card. The biggest problem in the actual use of this method is troublesome, users need to change the card frequently, although this method is very secure, in line with the idea of "one password at a time" in cryptography.

The security authentication layer provides relevant security mechanisms to implement user identity authentication, including technologies such as what are the main technologies.

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Hello, glad to answer for you. At present, the Internet identity authentication is mainly realized in the form of personal certificates, passwords, and so on.

Common authentication security technologies are:

PKI technology. PKI technology is an identity authentication technology based on the public and private key cryptography system, which realizes the function of secure identity authentication and data encryption by assigning a private key and a leaking public key certificate to each user.

Dynamic password technology. Adjustments are made on the traditional static password technology Xiangpiqing, and the password memorized by the user becomes the password generated by the device held by the user, and it is constantly changing. This can effectively avoid the problem of password loss caused by malicious programs such as Trojan viruses, because the password is a one-time handicap, and it is useless to take it before it is stolen after use.

Matrix card technology. This technology can be said to be a simplification of dynamic password technology, the basic principle of which is to pre-print some numbers with the wisdom code of the Yuanyan machine on a card, and the system will randomly ask the user to enter some of the numbers on the card every time the user logs in, instead of all. In this way, the content of the password entered by the user this time and the next login is different.

One-time code card technology. This technique can be said to be the most perfect and the most difficult to apply in practice. Some random digital passwords are printed on the card in advance, and the user takes out one to use when logging in, and the password will be invalid if used once, and the next login must use another one, and wait until all the passwords on a card are used up, and then go to change the card.

The biggest problem in the actual use of this method is trouble, users need to change the card frequently, although the security of this method is very good, in line with the idea of "one secret at a time" in cryptography.

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It's a multiple-choice question, right?

ABCD Select All, these are the features of cybersecurity services.

Logical security in information security does not include which of the following ( ) a, information integrity b, information confidentiality c, information availability d, information non-repudiation.

Answer: C Information security, ISO (International Organization for Standardization) definition is: the establishment and adoption of technical and management security protection for data processing systems, in order to protect computer hardware, software, and data from destruction, alteration and leakage due to accidental and malicious reasons.

Chinese companies have always maintained a good track record in information security. Huawei has long openly announced to the world that it is willing to sign a no-backdoor agreement, and that it is willing to establish a cybersecurity assessment center in any country to be tested by foreign parties.

At this stage, although the lifestyle is simple and fast, it is also accompanied by many information security risks. For example, fraud**, "naked loans" for college students, sales information, and doxing information all have an impact on the security of personal information. Criminals steal personal information through various software or programs, and use the information to make profits, seriously affecting the safety of citizens' lives and property.

The wanton dissemination of personal information on the Internet, the endless stream of sales and other situations occur from time to time, from the root cause, which is closely related to the lack of sufficient awareness of information protection among citizens. Citizens' awareness of protecting personal information is relatively weak, which creates conditions for information theft.

**When taking regulatory and protection measures for personal information, there may be a problem of blurred boundaries, which is mainly related to the vague management concept and lack of mechanism. Some places** have not set up specialized regulatory departments based on personal information, resulting in problems such as unclear responsibilities and low management efficiency.

Answer]: C authentication generally has account finger answers, password authentication, and authentication using summary algorithms and PKI-based authentication.

Authentication can only prevent active attacks, not passive attacks.

The security of cryptography refers to its ability to effectively protect information and data from unauthorized access, tampering, and leakage. Security depends on a number of factors, including the strength of the cryptographic algorithm, the security management of the key, the security of the encryption and decryption process, and the rationality and execution of the cryptographic policy. The key to the security of cryptography is to prevent unauthorized persons from gaining access to sensitive information or compromising the integrity of the data.

Strong cryptographic algorithms and encryption methods are fundamental to ensuring security. Cryptographic algorithms need to be attack-resistant and able to resist a variety of attacks, including brute-force attacks, dictionary attacks, and differential linear cryptanalysis. Key management is also critical, including the process of generating, distributing, storing, and updating keys.

Keys must be properly protected against leakage and unauthorized access. In addition, security during encryption and decryption must be guaranteed to prevent man-in-the-middle attacks and side-channel attacks, among other things. The reasonableness of the password strategy is an important part of ensuring the security of the password, including the complexity of the password mask, the regular replacement of passwords, and the prohibition of password sharing.

A proper password strategy can effectively reduce the risk of passwords being guessed or cracked.

There are two main types, unconditional security and computationally safe;

Unconditional security means that no matter how many ciphertexts the decipher is, given an infinite ciphertext, he will not be able to decipher the corresponding plaintext;

Computationally safe means that the decipherment cost exceeds the value of the information or the decipherment time exceeds the validity period of the information.

Decoding method. The methods used by cryptanalysts to decipher or attack passwords mainly include exhaustive attack method, statistical analysis method and mathematical analysis attack method.

Brute force attack.

Brute force attacks are also known as brute force attacks. This attack method attempts to traverse all possible keys for the intercepted ciphertext until an intelligible conversion from ciphertext to plaintext is obtained; Or encrypt all possible plaintext with an immutable key until the intercepted ciphertext is consistent.

Statistical analysis.

A statistical analysis attack is a method in which a cryptanalyst deciphers a password based on the statistical rules of plaintext, ciphertext, and keys.

Mathematical analysis.

A mathematical analysis attack refers to a cryptoanalyst who deciphers a cryptographic code by mathematical solution based on the mathematical basis and certain cryptographic characteristics of the encryption and decryption algorithm. Mathematical analysis attacks are a major threat to various cryptographic algorithms based on mathematical puzzles.

It can be roughly divided into 2 parts, one is hardware encryption and the other is software encryption. Hardware encryption is the actual encryption method, while software encryption is the virtual encryption method.

There are two definitions of cryptosystem security: plaintext and ciphertext.

Definitions: 1. Plaintext

Plaintext can generally be simply thought of as a meaningful set of characters or bits, or a message that can be obtained through some public encoding standard. Plaintext is often denoted by m or p.

2. ciphertext

The output after applying some kind of camouflage or transformation to the plaintext can also be considered a set of characters or bits that cannot be directly understood, and the ciphertext is often represented by C.