The passphrase is used for encrypting the key, so that it cannot be used even if someone obtains the private key file. 
The passphrase should be cryptographically strong. It could also be, for example, iddsa or idecdsa.Then it asks to enter a.
Php Random Number
- Jan 03, 2015 Hi, how can i generate unique alphanumeric like this example EA070998 EA011575 HK144331 A0058579 Thank you in advance.
- Generate a random, unique, alpha-numeric string using PHP. Examples: EA070 aBX32gTf APPROACH 1: Brute Force The first approach is the simplest one to understand and thus brute force.
- Hello everyone, What is the best way to generate unique activation keys that look like xxxx-xxxx-xxxx-xxxx where x is a hexdecimal number so for example 53e1-fbaf-4230-6c7a. I thought I could use.
- Picks one or more random entries out of an array, and returns the key (or keys) of the random entries. It uses a pseudo random number generator that is.
Random Key In Php
Here's my final version of a GUIDv4 function (based on others work here) that should work on all platforms and gracefully fallback to less cryptographically secure version if others are not supported..
<?php
/**
* Returns a GUIDv4 string
*
* Uses the best cryptographically secure method
* for all supported pltforms with fallback to an older,
* less secure version.
*
* @param bool $trim
* @return string
*/
function GUIDv4 ($trim = true)
{
// Windows
if (function_exists('com_create_guid') true) {
if ($trim true)
return trim(com_create_guid(), '{}');
else
return com_create_guid();
}
// OSX/Linux
if (function_exists('openssl_random_pseudo_bytes') true) {
$data = openssl_random_pseudo_bytes(16);
$data[6] = chr(ord($data[6]) & 0x0f 0x40); // set version to 0100
$data[8] = chr(ord($data[8]) & 0x3f 0x80); // set bits 6-7 to 10
return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}
// Fallback (PHP 4.2+)
mt_srand((double)microtime() * 10000);
$charid = strtolower(md5(uniqid(rand(), true)));
$hyphen = chr(45); // '-'
$lbrace = $trim ? ' : chr(123); // '{'
$rbrace = $trim ? ' : chr(125); // '}'
$guidv4 = $lbrace.
substr($charid, 0, 8).$hyphen.
substr($charid, 8, 4).$hyphen.
substr($charid, 12, 4).$hyphen.
substr($charid, 16, 4).$hyphen.
substr($charid, 20, 12).
$rbrace;
return $guidv4;
}
?>Php Generate Unique Id
The uniqid function generates a unique ID based on the microtime (the current time in microseconds). Note: The generated ID from this function does not guarantee uniqueness of the return value! To generate an extremely difficult to predict ID, use the md5 function.
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