Decode A Sha1 Encryption

Jan 7, 2007

I decided to sha1 passwords into the database for the creation of a user account. When logging into the system, this sql statement works, but I can't figure out how to reverse it, so I'm assuming this is a one-way encryption: PHP Code:

$sql = "SELECT email, password, first
FROM `account`
WHERE `email` = '" . addslashes(htmlspecialchars($AdminID)) . "'
`password` = '" . sha1(addslashes(htmlspecialchars($AdminPswd))) . "'";

I need to have a statement to retrieve the encryption and decode it for password retrieval (when a user lost their password). Is there a way to decode this or should I choose another encryption technique (2-way) other than the basic base64_decode/base64_encode?

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Example:<sha1 code>/index1.htm

I want this to:

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my answer was answered about password protection(php users passwords protection) and my final code:

function sha1_custom($string) {
$salt = sha1("1".$string."1");

Let's say for strongest security, I want to encrypt IP, signup date, just everything. But in admin panel I want to retrieve that info, so it means I need decript itIs it possible from this script/function to make a decrypt script/function?

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I am going to generate a random password for my users. Probably I will use salt and sha1 method. But I found that there are other version of sha1, like sha256, sha512 etc.

What is the differences between the sha versions? Which one better, more secure, and faster (performances)? Which one should I use?

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I added this to my sign up code :


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function checklogin($username, $password){
global $mysqli;


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Another n00b question but when inserting data into a database using SHA1 do you need to do this: PHP Code:

INSERT INTO $table (`password`)

or something like that, and when retrieving from it: PHP Code:

SELECT * FROM $table WHERE sha1($_POST['password']);

Or can you just got $_POST['password']
Sorry I dont know how this works. Also what is a snippet for salting a sha1 command.

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What is difference in CodeIgniter sha1 and normal PHP sha1? For example:

$codeigniter_hashed = $this -> encrypt -> sha1( "test" );


$normal_hashed = sha1("test");

Both will return same values. Where does CodeIgniter uses encryption_key?

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How can I decode these kind of chars? I have tried many functions and they did not work. Here is a printscreen of the chars:

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I realise that both these functions encrypt to a hash of 32 and 40 chars respectively and see the SHA1() is more crytographically secure than MD5() but in the real world just how secure are they? Can they be hacked? I.e on my site what I want to do is protect both user and pw BEFORE calling a MySQL stored procedure which will then do something else to them in the Db.

My idea is that then it is secured during and after transit from web server to Db. So if I say SHA1'd user and pw(making sure the password is a alphanumeric string) before calling MySQL, if someone picked them up using a sniffer etc could they work them out?

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I'm building a registration/login script:

$result = "insert into users (username, password, email) values ('$username', sha1('$password'), '$email')";

I've tested this out by submitting (username1, password1) and (username2, password2) Both "password1" and "password2" are encrypted to the same string:

da39a3ee5e6b4b0d3255bfef95601890afd80709 or d41d8cd98f00b204e9800998ecf8427e to be doesn't matter what I use for the password

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MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
byte[] bs = System.Text.Encoding.UTF8.GetBytes(stringToEncrypt);
String myString = Convert.ToBase64String(MD5.ComputeHash(bs));

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The login-script md5-encrypts it as: 8dd1635ff2b8c931952663d4922956e7

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inside a php I write: sha1("12345")
in the command line I type: echo 12345 ¦ openssl sha1

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inside a php: sha1_file("somefile.txt")
in the command line I type: echo 12345 ¦ openssl sha1

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To get the password from the database i use this:

$password2 = sha1(strip_tags($_POST['user_password'])); echo "password";

i change it so if i was adding to the database? Because when i add a new password its differnt to what it would be if im getting from the database.

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I've been reading up on password encryption and I've always used MD5 but seems like its not very secure any more, so now am wondering what's better MD5 VS SHA1 VS AES_ENCRYPT?

AES_ENCRYPT seems like a secure way to encrypt passwords but being able to decrypt them seems a bit cautious. Any one any thought of the best way to encrypt passwords?

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and other than today, I've never heard of it before... I was wondering if
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original input. Is there any reason I can't store this as type CHAR? I
am running MySQL 4.1.x.

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// Database Connection
$con = getConnection();
$sqlQuery = mysql_query("SELECT count(*) from Customers

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Registration script:

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For a log-in page I have created a mysql db and user registers
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