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One of the most important parts of a trang web is the authentication system & it is commonplace for developers khổng lồ commit mistakes leaving out vulnerabilities for others lớn exploit. Since PHP is a server-side scripting language, it is responsible for all the back-end functionalities required by the website. In this article, we will learn how to lớn decrypt md5 password in PHP in the following sequence:

What is MD5 hashing?

How khổng lồ use MD5 in PHP?

Syntax

How to Decrypt MD5 Passwords in PHP?

Examples

Let’s begin.

Why do we need MD5 in PHP?

One basic example could be storing & using user passwords in its true form, in this situation an unauthorized person might get access khổng lồ the database and the whole system is compromised. Khổng lồ prevent this situation password hashing is used. Password hashing can be defined as a method that takes the user password or string & encrypts it into a fixed-length password, PHP has a few functions lớn achieve the same lượt thích md5(), sha1(), hash().

What is MD5 hashing?

MD5 hashing algorithm generates a 32 characters string (hexadecimal) for any word or phrase we give in the input. We can even encrypt an entire file into an MD5 hash. The algorithm can also be used for digital signature applications, where a large tệp tin is compressed in a secure manner và then encrypted with the help of a private key.

How to use MD5 in PHP?

To calculate the MD5 hash of a string PHP has a pre-defined function md5(). The md5() function calculates the MD5 hash of a string input & returns the hash hexadecimal number. The md5() function uses the MD5 Message-Digest Algorithm.

Syntax:

md5(string,raw)

Parameter

Description

string

Mandatory. It is the input string that needs to lớn be calculated

raw

Optional. Specifies binary or hex output format:

If it is set khổng lồ TRUE – Raw 16 character binary format

If it is set to lớn FALSE – Default. 32 character hex number

Return Type:

md5() returns hash as a 32-character hexadecimal number.

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How khổng lồ Decrypt MD5 Passwords in PHP?

The MD5 cryptographic algorithm is not reversible i.e. We cannot decrypt a hash value created by the MD5 lớn get the input back to its original value. So there is no way lớn decrypt an MD5 password. But, we can use something like brute force hacking, which is extremely resource-intensive, not practical, và unethical. Thus, if someone is entering the correct password, we need to lớn find the hash value of whatever the user entered, và see if it matches what we have in our database thus it is time & resource-intensive job to perform.

It is possible to lớn guess what the original password is by looking in dictionaries of MD5 hashes of many known words, these dictionaries can be useful khổng lồ tell a user that the password that he has chosen may be easily discovered thus we can ask the user lớn build a more strong password.

Examples khổng lồ Decrypt MD5 Password

Example 1:

Output:

In the above example, we kiểm tra if the hash value of variable $string is equal to 9a1359e7be2d2670780b85471675dc72 the program prints out “PHP with Edureka is Fun” else it prints “look for the error”

Example 3

”; echo “Setting raw input đầu vào to TRUE getting 16 character binary: “.md5($string, TRUE).””; echo “default raw input set to lớn FALSE giving 32 charater hex number: “.md5($string).””; ?>

Output:

In the above example, we look at the application of the raw parameter in the md5() function. If we set it to TRUE it gives a 16 character binary output đầu ra else it simply gives 32 characters hex number.

Correct password “; } else echo “ Incorrect password “; } ?>

Output:

The above code gives an đầu ra of an HTML khung with a text block và a submit button if we enter the correct password it prints “Correct password” else it prints “Incorrect password”.

When we type in the wrong password for example here it checks for the hash of “pass” input đầu vào with the hash of “pass123” the correct password if it does not match it gives out as follows

It prints out “Incorrect password”

If we type in the right password (i.e “pass123”) the hash of the input đầu vào matches with the hash of the correct password & it gives the following output

It prints out “Correct password”

Now with this, we have come lớn the end of the PHP Tutorial. I hope you guys enjoyed this article & understood the concepts of decryption. So, with the kết thúc of this PHP Tutorial, you are no longer a newbie to lớn the scripting language.