glossary - What is a UUID? - Stack Overflow
2008年11月15日 · A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems. The term globally unique identifier (GUID) is also used, typically in software created by Microsoft. When generated according to the standard methods, UUIDs are for practical purposes unique.
javascript - How do I create a GUID / UUID? - Stack Overflow
2019年5月7日 · The algorithm: The Math.random() function returns a decimal number between 0 and 1 with 16 digits after the decimal fraction point (for example 0.4363923368509859). Then we take this number and convert it to a string with base 16 (from the example above we'll get 0.6fb7687f). Math.random().toString(16).
How to create a GUID/UUID in Python - Stack Overflow
2022年8月6日 · from typing import Optional import re import subprocess import uuid def get_windows_uuid() -> Optional[uuid.UUID]: try: # Ask Windows for the device's permanent UUID. Throws if command missing/fails. txt = subprocess.check_output("wmic csproduct get uuid").decode() # Attempt to extract the UUID from the command's result.
Is there any difference between a GUID and a UUID?
2021年11月2日 · The simple answer is: no difference, they are the same thing. For most practical purposes, treat them as 16 byte (128 bits) values that are used as a unique identifier. In Microsoft-speak they are called GUIDs, but call them UUIDs when not using Microsoft-speak. Even the authors of the UUID specification and Microsoft claim they are synonyms:
Which UUID version to use? - Stack Overflow
2013年12月3日 · There are two different ways of generating a UUID. If you just need a unique ID, you want a version 1 or version 4. Version 1: This generates a unique ID based on a network card MAC address and current time. If any of these things is sensitive in any way, don't use this. The advantage of this version is that, while looking at a list of UUIDs ...
Advantages and disadvantages of GUID / UUID database keys
15. The main advantages are that you can create unique id's without connecting to the database. And id's are globally unique so you can easilly combine data from different databases. These seem like small advantages but have saved me a lot of work in the past.
What kind of data can you extract from a UUID? - Stack Overflow
2009年11月10日 · The OSSP uuid tool can decode UUIDs of all versions. On Debian-based Linux systems you can use apt-get install uuid to install it; for other distributions, the package name might be different. To decode a UUID, use the -d (decode) flag: uuid -d AAAAAAAA-BBBB-CCCC-DDDD-FFFFFFFFFFFF.
Generating v5 UUID. What is name and namespace?
Roughly speaking, a type 3 or type 5 UUID is generated by hashing together a namespace identifier with a name. Type 3 UUIDs use MD5 and type 5 UUIDs use SHA1. Only 128-bits are available and 5 bits are used to specify the type, so all of the hash bits don't make it into the UUID. (Also MD5 is considered cryptographically broken, and SHA1 is on ...
What is the max character length of a UUID? - Stack Overflow
233. Section 3 of RFC4122 provides the formal definition of UUID string representations. It's 36 characters (32 hex digits + 4 dashes). Sounds like you need to figure out where the invalid 60-char IDs are coming from and decide 1) if you want to accept them, and 2) what the max length of those IDs might be based on whatever API is used to ...
guid - How unique is UUID? - Stack Overflow
2009年7月20日 · There is more than one type of UUID, so "how safe" depends on which type (which the UUID specifications call "version") you are using. Version 1 is the time based plus MAC address UUID. The 128-bits contains 48-bits for the network card's MAC address (which is uniquely assigned by the manufacturer) and a 60-bit clock with a resolution of 100 ...