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Anonymous users2024-02-07The characteristics of the MD5 algorithm are as follows:1. The length is fixed. Regardless of how many bytes of information are inputted, the output bytes are always 16 bytes.
2. The result is irreversible. The original data cannot be deduced from the results, because no matter how many bytes of information is inserted into the input, the output is always 16 bytes.
3. High degree of discreteness.
The 16 bytes of the output are closed, and there is no pattern to speak of. If the two inputs change by only one bit, the output will be completely different.
4.It is very difficult to achieve the same MD5 with two different data.
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Anonymous users2024-02-06MD5 stands for Message-Digest Algorithm 5, which was invented in the early 90's by MIT's Computer Science Lab and RSA Data Security Inc, and developed from MD2, MD3 and MD4.
message-digest generally refers to the hash transformation of a byte string (message), that is, the transformation of a byte string of any length into a large integer of a certain length. Note that I used the word "byte string" instead of "string" because this transformation is only about the value of the byte, not about the character set or how it is encoded.
MD5 converts arbitrary length of "string of bytes" into a large integer of 128 bits, and it is an irreversible string conversion algorithm, in other words, even if you see the source program and the description of the algorithm, you can't convert a value of MD5 back to the original string, mathematically speaking, because there are infinitely many original strings, which is a bit like a mathematical function with no inverse function.
A typical application of MD5 is to generate a fingerprint on a message to prevent it from being "tampered with". For example, if you write a paragraph in a file called and generate an md5 value for this and record it, then you can spread the file to someone else, and if someone changes anything in the file, you will find out when you recalculate the md5 of the file (the two md5 values are not the same). If there is a third-party certification authority, MD5 can also prevent "repudiation" by the author of the document, which is called a digital signature application.
MD5 is also widely used in encryption and decryption technology, in many operating systems, the user's password is saved in the form of MD5 value (or similar other algorithms), when the user login, the system calculates the password entered by the user as the MD5 value, and then compares it with the MD5 value saved in the system, and the system does not "know" what the user's password is.
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Anonymous users2024-02-05Message Digest Algorithm MD5 (Chinese name Message Digest Algorithm 5th Edition) is a hash function widely used in the field of computer security to provide integrity protection of messages.
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