uniqueidentifier

For several cases I would need to create random md5 hashes. Do you know what the best / most secure ways of doing this are? Some use cases Verifying an email address Resetting passwords Some kind of session id used for authentication, instead of password (eg: when someone hits "remember me", I would not like to store the pass in a cookie) Background I know that rand() should not be used for security relevant applications. For that reason I went with: md5( uniqid(mt_rand(),true) ); Now I read in the php manual about uniqid() , that it must not be used for security purposes . Which kind of makes

I had application uploaded on apple store. Now I am developing update version. But instead on working on existing project, i created new project with different name. When i finished i changed name and bundle identifier to match existing app. I tried uploading app to test flight but i got error "Invalid IPA: The keychain-access-group in the embedded.mobileprovision and your binary don't match." So I started browsing net for answers... What I have come up is to enable entitlements. I did, but to no avail... Then i edited entitlements, changing from this: $(AppIdentifierPrefix)com.xxxx to this:

I am working on an Android project which relies on the unique UID of a discovered NFC tag to process the tag. I extract this UID using the following code: byte[] extraID = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID); However, for some technologies this UID is randomly generated for security purposes. Does anybody have an idea how I could detect that this is a randomly generated UID? Is there some kind of flag that is set? note: a simple solution would be to read the tag twice and compare the UIDs. However, I would like to avoid this. For NfcA (and IsoDep and/or MifareClassic combined with

I've read this question about getting the identity of an inserted row. My question is sort of related. Is there a way to get the guid for an inserted row? The table I am working with has a guid as the primary key (defaulted to newid), and I would like to retrieve that guid after inserting the row. Is there anything like @@IDENTITY , IDENT_CURRENT or SCOPE_IDENTITY for Guids? You can use the OUTPUT functionality to return the default values back into a parameter. CREATE TABLE MyTable ( MyPK UNIQUEIDENTIFIER DEFAULT NEWID(), MyColumn1 NVARCHAR(100), MyColumn2 NVARCHAR(100) ) DECLARE

It is possible to know others NFC TAG ID when we used to the APK & TAG each phones. For example, Phone A and B try to tag. Then Phone A can know Phone B's NFC TAG ID (4 Bytes - HEX). But I wanna know how to know my NFC TAG ID on my phone. Not used other phones. If you know any other information, please give me your advice on that. A phone does not necessarily have a fixed anti-collision identifier ("NFC Tag ID", as you call it). For instance, it could have an anti-collision identifier, that is randomly allocated on every activation (e.g. external HF field is turned on, phone is turned on, etc.

i know, that two elements can't hav the same id. But it's happens so, that in my project i have two elements with same id in other divs, like this <div id="div1"> <img id="loading" /> </div> <div id="div2"> <img id="loading" /> </div> and css: #div1 #loading { some style here... } #div2 #loading { another style here... } works fine for me, but maybe it is not reccomended to do by so? Thanks UPDATE Yes, i know, thet i can use classes, and it's strongly recomended to do by so, but i want to know is there any potential risk in this usage of id? i think no, becouse when i wrote for example $("