uniqueidentifier

问题 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

问题 I ordered a bunch of NFC tags from a Chinese supplier (I know, red flags) with the promise that they will serialize my tags as instructed so it will work w/ our software and avoid serial duplicates. (Our software uses the tags' serial numbers, not the content.) Now the thousands of NFC tags arrived and it seems they have disregarded the proper serialization, and worst, half of the darn thing are duplicates (completely unusuable for our purpose!) So now I'm in a hole :( So is there a software

问题 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. 回答1: 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,

问题 How to find the Mac OSX serial number. Sometimes it is required to get serial number of a mac, and you validate on that. I needed the same, few years back, when I developed a plugin for OsiriX. I was asked to release it in such a way, only few systems can use that plugin. If we get any better solution than this, that will be quite helpful for all of us. 回答1: The following code is mainly copied from Technical Note TN1103, with small modifications to return an NSString and to make it compile

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Python “is” operator behaves unexpectedly with integers I stumbled upon the following Python weirdity: >>> two = 2 >>> ii = 2 >>> id(two) == id(ii) True >>> [id(i) for i in [42,42,42,42]] [10084276, 10084276, 10084276, 10084276] >>> help(id) Help on built-in function id in module __builtin__: id(...) id(object) -> integer Return the identity of an object. This is guaranteed to be unique among simultaneously

问题 Consider I've two numbers 1023232 & 44. I want to generate a unique number representing this combination of numbers. How can i generate it? Requirement f(x,y) = f(y,x) and f(x,y) is unique for every (x,y) or (y,x) 回答1: if those are two ints, you could just do this: ulong F(int x, int y) { ulong id = x > y ? (uint)y | ((ulong)x << 32) : (uint)x | ((ulong)y << 32); return id; } if you need to generate a truly unique value for two variables of a given size, you need about double the size of each

问题 This question already has answers here : Unique Identification of iOS device for iOS 7.0 and above (6 answers) Closed 3 years ago . In my iOS app, I have to restrict the user to use iOS app per device. To do this I found a solution that we can use the UUID (Universally Unique Identifier) or UDID (Unique Device Identifier) . But according to this answer I can't use UUID, because if app gets deleted or reinstalled UUID has been getting changed and I don't want this. Also Apple rejects apps if

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: UIDevice uniqueIdentifier Deprecated - What To Do Now? Even if Apple was not at Barcelone's MWC (mobile world congress), there was the certitude that getting the deviceID will be deprecated in further iOS SDK. I do not understand why Apple want to restrict this, but that's not the topic. I must prepare my application to an alternative because my users are identified and known for a better use of my app (don't

问题 I'm looking for a way to get a number which will almost surely change when running the code on different machines and almost surely stay the same between two runs on the same machine. If I were doing this as a shell script in Linux, I would use something like this: { uname -n ; cat /proc/meminfo | head -n1 ; cat /proc/cpuinfo ; } | md5sum But I need this in C++ (with boost) and at least on Windows, Linux and Mac. 回答1: To generate a mostly unique machine id, you can get a few serial numbers

问题 What can be with [UIDevice currentDevice] , such as uniqueIdentifier? Thanks! 回答1: All the properties and methods associated with a UIDevice Object are described in the UIDevice Class Reference To access the Unique Identifer, you can do something like: NSString *identifier = [[UIDevice currentDevice] uniqueIdentifier]; 回答2: Because this is slightly out of date now I am just giving an up to date answer. Because Apple has seen fit to stop developers using the [[UIDevice currentDevice]