How to check the MD5 code of your password

MD5 is often used on forums and software releases, in order to ensure the correctness of the file, to prevent some people from stealing the program, adding some Trojans or tampering with the copyright, a set of verification system designed. Each file can be calculated with a fixed MD5 code using the MD5 validator. Software authors often calculate the MD5 code of their programs in advance and post them on the Internet.

Therefore, when you see a program on the Internet that indicates the MD5 code, you can write it down, and use the MD5 verification program to calculate the MD5 code of the file you have, and compare it with the MD5 code you wrote down before, so you can know whether you are under the original version, if the two are the same, then what you are ** is the original. If the calculation does not match the one noted on the Internet, then the document of your ** is incomplete, or it has been tampered with by others. MD5 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".

Put your file in a certain location, and upload the file in the software that enters the modeling submission to automatically generate MD5 code, so you don't have to worry about it.

The MD5 information digest algorithm is a widely used cryptographic hash function that generates a 128-bit (16-byte) hash value to ensure that the message is transmitted in a complete and consistent manner. MD5 was designed by American cryptographer Ronald Linn Rivest and made public in 1992 to replace the MD4 algorithm.

The algorithm is specified in the RFC 1321 standard. After 1996, the algorithm was proven to be weak and could be cracked, and for data that required a high degree of security, experts generally recommend using other algorithms instead, such as years, which proved that the MD5 algorithm could not prevent collisions, so it was not suitable for security authentication, such as SSL public key authentication or digital signatures.

The principle of MD5 algorithm can be briefly described as follows: MD5 code processes the input information in 512-bit packets, and each packet is divided into 16 32-bit sub-packets, after a series of processing, the output of the algorithm is composed of four 32-bit packets, and a 128-bit hash value will be generated after the cascading of these four 32-bit packets.

The MD5 code can uniquely represent the characteristics of the original information, and is usually used for encrypted storage of passwords, digital signatures, file integrity verification, etc.

MD5 stands for message digest, which means message digest, but this message digest is not an abbreviation of information content, but a 128-bit feature code obtained after mathematically transforming the original information according to the published MD5 algorithm.

MD5 is 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 to verify the legitimacy of the user.

The MD5 check checks the correctness of the received transmitted data by performing hashing operations. The calculated hash value is compared to the hash value that travels with the data transfer. If the two values are the same, the transmitted data is intact and has not been tampered with (provided that the hash value has not been tampered with), so it can be used with confidence.

<> if it is necessary to decrypt it, it is as above.

The ones that need to be encrypted are as follows.

md5(c1ce5feb09f13848173f0485ceef36ab, 32) =8338d1093ee2d15f3f8dbccd93b9b6a9

md5(c1ce5feb09f13848173f0485ceef36ab, 16) =3ee2d15f3f8dbccd

Therefore, it is generally believed that the MD5 code can uniquely represent the characteristics of the original information, and is usually used for encrypted storage of passwords, digital signatures, file integrity verification, etc.