The hash value, also known as: the extension function is a method that creates a small number "fingerprint" from any kind of data. This functions compress the message or data into abstracts to make the amount of data smaller and fix the format of the data. This function mix the data and re -create a fingerprint called scatter value. This value is usually represented by a short random letter and numbers. A good latter function rarely occurs in the input domain. Different from the dispersion list and data processing, the data is not suppressed to distinguish the data, which will make it more difficult to find the database record. The expansion information: Haja value: All designated functions have the following basic features: if the two extended distribution values are different (according to the same function), then this The original input of the two distribution values is also different. This features are the result of the extension function of the laidial function. The extension function with this nature is called one -way dissipation function. But on the other hand, the input and output of the latency are not the only response relationship. If the two distribution values are the same, the two input values are likely to be the same. but may also be different. This situation is called "color", which is usually two input values of two different lengths, deliberately calculating the same output value. Enter some data to calculate the distribution value, and then partially changes the input value. A large -confusing characteristics of a strong confusion will generate a completely different distribution value. The typical distribution functions have very large definitions, such as SHA-2 byte string with maximum acceptance (2-1)/8 length. At the same time, the dissipation function must have a limited value domain, such as a fixed -length bit string. In some cases, the laid -to -line function can be designed to have a single shot between the definition domain and the value domain of the same size. The distribution function must be irreversible. Reference information Source: Baidu Encyclopedia-hash value
The hash value, also known as: the extension function is a method that creates a small number "fingerprint" from any kind of data. It, through a certain hash algorithm (typical MD5, SHA-1, etc.), a long data is mapped into shorter data. This small data is the hash value of big data. He has such a characteristic. He is the only one. Once the big data changes, even if it is a small change, his hash value will change. The role of hash values: hash value, that is, the hash value, is a set of binary values obtained by encrypted the content of the file content. The main purpose is for file verification or signature. It is precisely because of this characteristic that it is often used to determine whether the two files are the same. For example, download a file from the Internet, as long as the original hash value of this file is compared with the hash value obtained after downloading, if the same Damage files. If it is not consistent, it indicates that the downloaded file is different from the original file, and the file is damaged during the download process. The above reference: Baidu Encyclopedia-Hach Function
Pay content for time limit to check for freenAnswer the hash value, also known as the hash function, refers to a function that storage the position of the element in the element as the element. The general linear table, the relative position recorded in the structure is random, that is, there is no determined relationship between the keywords of the record. Therefore, a series of and keyword comparisons need to be performed in the structure.nQuestion hash algorithmnDifferent from hash valuesnAnswer a littlenThe hash algorithm maps the binary value of any length to the binary value of a shorter fixed length. This small binary value is called the hash value. The hash value is the only and extremely compact value of the data. If a paragraph of the extension and even if only one letter from the paragraph, the subsequent hash will generate different values. To find two different inputs with the same value, it is impossible to calculate, so the hash value of the data can test the integrity of the data. Generally used to quickly find and encrypt algorithms.n3 morenBleak
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The hash algorithm maps the binary value of any length to a smaller binary value of the fixed length. This small binary value is called the hash value. The hash value is the only and extremely compact value of the data. If a paragraph of the extension and even if only one letter from the paragraph, the subsequent hash will generate different values. It is impossible to find two different inputs with the same value as the same value. In information authentication code (MAC) hash function is usually used to sign the data with digital signatures, while message detection code (MDC) hash function is used for data integrity. I Hong and Xiaoming can use the hash function below to ensure data integrity. If Xiaohong wrote a message to Xiaoming and created the news, Xiaoming can laid the news later and compare his hash with the original hash. If the two hash values are the same, the message is not changed; but if the value is different, the message has been changed after the red writing it. In order to make this system running, Xiaohong must keep the primitive hash value of everyone except Xiaoming.
The hash value, also known as: the extension function is a method that creates a small number "fingerprint" from any kind of data.
This functions compress the message or data into abstracts to make the amount of data smaller and fix the format of the data. This function mix the data and re -create a fingerprint called scatter value.
This value is usually represented by a short random letter and numbers. A good latter function rarely occurs in the input domain. Different from the dispersion list and data processing, the data is not suppressed to distinguish the data, which will make it more difficult to find the database record.
The expansion information:
Haja value:
All designated functions have the following basic features: if the two extended distribution values are different (according to the same function), then this The original input of the two distribution values is also different.
This features are the result of the extension function of the laidial function. The extension function with this nature is called one -way dissipation function. But on the other hand, the input and output of the latency are not the only response relationship. If the two distribution values are the same, the two input values are likely to be the same.
but may also be different. This situation is called "color", which is usually two input values of two different lengths, deliberately calculating the same output value.
Enter some data to calculate the distribution value, and then partially changes the input value. A large -confusing characteristics of a strong confusion will generate a completely different distribution value.
The typical distribution functions have very large definitions, such as SHA-2 byte string with maximum acceptance (2-1)/8 length. At the same time, the dissipation function must have a limited value domain, such as a fixed -length bit string.
In some cases, the laid -to -line function can be designed to have a single shot between the definition domain and the value domain of the same size. The distribution function must be irreversible.
Reference information Source: Baidu Encyclopedia-hash value
The hash value, also known as: the extension function is a method that creates a small number "fingerprint" from any kind of data.
It, through a certain hash algorithm (typical MD5, SHA-1, etc.), a long data is mapped into shorter data. This small data is the hash value of big data. He has such a characteristic. He is the only one. Once the big data changes, even if it is a small change, his hash value will change.
The role of hash values:
hash value, that is, the hash value, is a set of binary values obtained by encrypted the content of the file content. The main purpose is for file verification or signature. It is precisely because of this characteristic that it is often used to determine whether the two files are the same.
For example, download a file from the Internet, as long as the original hash value of this file is compared with the hash value obtained after downloading, if the same Damage files. If it is not consistent, it indicates that the downloaded file is different from the original file, and the file is damaged during the download process.
The above reference: Baidu Encyclopedia-Hach Function
Pay content for time limit to check for freenAnswer the hash value, also known as the hash function, refers to a function that storage the position of the element in the element as the element. The general linear table, the relative position recorded in the structure is random, that is, there is no determined relationship between the keywords of the record. Therefore, a series of and keyword comparisons need to be performed in the structure.nQuestion hash algorithmnDifferent from hash valuesnAnswer a littlenThe hash algorithm maps the binary value of any length to the binary value of a shorter fixed length. This small binary value is called the hash value. The hash value is the only and extremely compact value of the data. If a paragraph of the extension and even if only one letter from the paragraph, the subsequent hash will generate different values. To find two different inputs with the same value, it is impossible to calculate, so the hash value of the data can test the integrity of the data. Generally used to quickly find and encrypt algorithms.n3 morenBleak
00:00 / 02: 0270% shortcut keys to describe space: Play / suspend ESC: exit full screen ↑: increase volume 10% ↓: reduced volume decrease by 10% →: single fast forward 5 seconds studio Here you can drag no longer appear in the player settings to reopen the small window shortcut key description
The hash algorithm maps the binary value of any length to a smaller binary value of the fixed length. This small binary value is called the hash value. The hash value is the only and extremely compact value of the data. If a paragraph of the extension and even if only one letter from the paragraph, the subsequent hash will generate different values. It is impossible to find two different inputs with the same value as the same value.
In information authentication code (MAC) hash function is usually used to sign the data with digital signatures, while message detection code (MDC) hash function is used for data integrity.
I Hong and Xiaoming can use the hash function below to ensure data integrity. If Xiaohong wrote a message to Xiaoming and created the news, Xiaoming can laid the news later and compare his hash with the original hash. If the two hash values are the same, the message is not changed; but if the value is different, the message has been changed after the red writing it. In order to make this system running, Xiaohong must keep the primitive hash value of everyone except Xiaoming.