Shulou(Shulou.com)05/31 Report--

This article mainly explains "case analysis of server data integrity problems". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "server data integrity problem case analysis" it!

What are the potential causes of illegal data?

The data integrity performance prevents a series of problems such as data violating the instructions of the system and being tampered with. Some of the potential problems include:

Physical failure: transmitting a large amount of data using poor media may destroy the data. For example, the wireless signal may be temporarily lost, or the line may be interfered by noisy electrical signals.

Data problems: the software responsible for conveying information may have some vulnerabilities that inadvertently mutate a subset of the information.

Malicious tampering: a middleman may be changing the information to confuse the correspondent or learn valuable information.

Solution-checksum

Checksum can solve the above three potential data integrity problems. A checksum is a definite value derived from information data and can be transmitted separately, which means that the checksum of a given information is always the same.

The recipient of the information can generate a checksum from the information, and if the generated checksum matches the checksum of the transmitted message, the transmitted information will not be tampered with.

It is important to note that if the medium in which the checksum is obtained is unreliable, both the information and the checksum may be tampered with by the middleman. It is usually better to sign a digital signature on the checksum, which can prove the identity of the sender of the checksum.

What is a good checksum?

There are many types of checksums, but the best checksum is usually an encrypted hash function. The hash function can generate a good checksum to verify the integrity of the data. Here are its properties:

Certainty: the hash value of the same information is always the same, and there is no randomness.

Speed: there is no need to use unnecessary resources to calculate checksums (KDF is an inefficient checksum).

Almost no coincidence: there is almost no chance that two different pieces of information will generate the same checksum.

Streamlining: hash results (also known as "summaries") should be short and do not waste a lot of data.

The SHA-256 hash function is typically used to create a checksum summary.

Example-verify the actual checksum

A common use case for checksums is the verification of downloads. In this example, we will download the bitcoin core node software and verify its integrity. Suppose you are using Mac OS. For other OS (operating systems), please follow the instructions on the download page.

Download program

Download checksum

Open the terminal and download the folder:

Cd ~ / Downloads

Calculate and print the checksum of the downloaded dmg file:

Shasum-a 256 bitcoin-0.19.1-osx.dmg

Should print:

206d8d92189d22e735393abebeb7a2e7237a119dd448b4a40df8c357da1287b2 bitcoin-0.19.1-osx.dmg

Then print the downloaded (expected) checksum:

CatSHA256SUMS.asc | grep bitcoin-0.19.1-osx.dmg

Should match:

206d8d92189d22e735393abebeb7a2e7237a119dd448b4a40df8c357da1287b2 bitcoin-0.19.1-osx.dmg

If you can match, then congratulations! Your download has been verified. The program you downloaded has not been maliciously tampered with.

In addition, remember that to verify that the checksum provided to you has not been tampered with, you also need to verify the GPG signature.

At this point, I believe that everyone on the "server data integrity case analysis" have a deeper understanding, might as well to the actual operation of it! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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