Well, you could look it up in Wikipedia… But since you want an explanation, I’ll do my best here: Hash Functions They provide a mapping between an arbitrary length input, and a (usually) fixed length (or smaller length) output. It can be anything from a simple crc32, to a full blown cryptographic hash function such … Read more
No. MD5 is not encryption (though it may be used as part of some encryption algorithms), it is a one way hash function. Much of the original data is actually “lost” as part of the transformation. Think about this: An MD5 is always 128 bits long. That means that there are 2128 possible MD5 hashes. … Read more
You should never escape, trim or use any other cleansing mechanism on passwords you’ll be hashing with PHP’s password_hash() for a number of reasons, the single largest of which is because doing additional cleansing to the password requires unnecessary additional code. You will argue (and you see it in every post where user data is … Read more
DISCLAIMER: This answer was written in 2008. Since then, PHP has given us password_hash and password_verify and, since their introduction, they are the recommended password hashing & checking method. The theory of the answer is still a good read though. TL;DR Don’ts Don’t limit what characters users can enter for passwords. Only idiots do this. … Read more
$ms = md5($transactionid.’:’.$secretkey); You need to concatenate with .
The function hash_equals() is not meant to verify a password with a hash, that’s the job of the password_verify() function, so don’t use hash_equals() in your code: // Hash a new password for storing in the database. // The function automatically generates a cryptographically safe salt. $hashToStoreInDb = password_hash($_POST[‘password’], PASSWORD_DEFAULT); // Check if the hash … Read more
hash = {“name”=>”XYZ”, “address”=>{“street”=>{“street_address”=>””,”city”=>”City name”}}, “form”=>{“id”=>11,”f_name”=>””}, “test”=>””} def remove_blanks hash hash.map do |k, v| v == ” ? nil : [k, v.is_a?(Hash) ? remove_blanks(v) : v] end.compact.to_h end remove_blanks hash #⇒ { # “address” => { # “street” => { # “city” => “City name” # } # }, # “form” => { # “id” … Read more
Hashes are uni-directional, so no. http://en.wikipedia.org/wiki/Hash_function
Don’t know if I understand exactly what u want but if u want to find in that map how many records have a value u should use it like this : public static void main(String[] args) { Map<String, List<String>> invertedindex = new HashMap<String, List<String>>(); List<String> myList = new ArrayList<>(); myList.add(“firstitem”); myList.add(“seconditem”); invertedindex.put(“book”, myList); invertedindex.put(“book2”, myList); … Read more