ObjectiveIn the past few weeks, I have investigated and researched the security of GSM in many aspects, such as the loopholes in GSM communication protocol. In addition, I have a security audit of the most widely used BTS software in the world today. In this article, I'll show you a few of the vulnerabilities I've found in this open source product that will allow an attacker to invade the base station transceiver (BTS) and remotely control its transce
characters, consisting of 1 underscores followed by 4-byte cycles and 4-byte salt values. They are encoded into printable characters, each character 6 bits, and the effective bit is the least preferred. 0 to 63 are encoded as "./0-9a-za-z". Using illegal characters in salt values will cause crypt () to fail.The CRYPT_MD5-MD5 hash uses a string salt value of 12 characters starting with $1$.The Crypt_blowfish-blowfish algorithm uses the following salt values: "$2a$", a two-bit cost parameter, "$"
Very detailed! Reprint LinkConversion of C + + base classes to derived classesIn public inheritance, private inheritance, and protection inheritance, only public inheritance preserves the characteristics of the base class well, preserving all members of the base class except constructors and destructors, and the access rights of the public or protected members of
subways, basements, indoor, suburban, road, etc., is also a headache. Traditionally, due to the limitations of technology and equipment, operators and network design departments often use the common base station plus repeater to solve these problems. The disadvantage of this approach is that it will bring about increased interference, high drop rate, maintenance difficulties and so on. How to use a technical means to make the network appear "soft" ch
Base classThe inheritance process creates a new derived class that consists of the members of the base class plus any new members added by the derived class. In multiple inheritance, you can build an inheritance diagram in which the same base class is part of multiple derived classes. The following illustration shows this class of diagrams.
Multiple instances
Item 7: declare Destructors (destructor) as virtual in polymorphic base classes (polymorphism base class)
By Scott Meyers
Translator: fatalerror99 (itepub's nirvana)
Release: http://blog.csdn.net/fatalerror99/
There are many ways to get the time, so it is necessary to establish a timekeeper base class (base class), and
C + + base class and derived class conversionsIn public inheritance, in private inheritance and protection inheritance, only public inheritance can preserve the characteristics of the base class, it retains all members of the base class except constructors and destructors, and the access rights of the public or protected members of the
Multiple inheritance and virtual base classes, multiple inheritance base classesMultiple inheritance of implicit classes describes classes with multiple direct base classes. Multi-inheritance brings two main problems:① Inherit the same name method from two different base classes;② Inherit multiple instances of the same
1, why the size of the class is not allowed in C + + is 0Class Zerosizet {}; Zerosizet Z[10];z[i]-z[j]; is usually obtained by dividing the number of bytes between two addresses by the type size, while the type size is 0 will be problematic2, why sometimes more than one class composition instance occupies the same spaceClass empty{};class emptytoo:public empty{};class emptythree:public emptytoo{};sizeof (Empty): 1sizeof (EmptyToo): 1sizeof (emptythree): 1Empty
C + + Primer Learning Note _31_ Object-oriented Programming (2)-Inheritance (ii): Inheritance and constructors, conversions from derived classes to base classes, base classes to derived classesa member function that cannot be automatically inheritedconstructor functionCopy constructorDestructors= operatorsecond, inheritance and constructor function The constructors of the
This article mainly introduces the usage of the HTML base tag, as well as the analysis of the role of the HTML base tag, let's take a look at this article.
First, let's analyze the role of the HTML base tag:
The base tag is the base URL tag in the HTML language, which is a
(Click here, next to the previous article)
Msgsender is known to be specially crafted for companyz. Next, consider derived class (derived class) loggingmsgsender:
Template Class loggingmsgsender: Public msgsender Public:...Void sendclearmsg (const msginfo info){Write "before sending" info to the log;
Sendclear (Info );// If Company = companyz,// This function doesn' t exist!Write "after sending" info to the log;}...
};
As written in comments, when the bas
This article mainly describes the use of HTML base tags, as well as the specific use of HTML base tag instance parsing, then let's look at this article together
First, let's start with the HTML base tag:
The
Typically, the browser extracts the corresponding element from the URL of the current document to fill in the whitespace in the relative URL.
Using
Note t
Google base is not just eBay! Exciting Google BaseWhen I saw the base on Google code, I searched for the relevant information. The Chinese language basically described him as an opponent of eBay.So I posted the following materials here to make more people realize the great significance of Google base.
Google base is
How to obtain the correct base estimation and base EstimationOriginal article: http://www.oracle.com/technetwork/issue-archive/2013/13-jan/o13asktom-1886639.htmlI have a question about joining with collections and cardinality estimation. the optimizer is always estimating that 8,168 rows are coming back from my collection, and because of that, it is using inefficient plans. the estimate of 8,168 is more tha
Base Station cloud Platform interface call instance, using curl to quickly access the base station cloud platform data interface, to obtain the base station data, and through JSON to parse the array data. Base Station Cloud Interface Development Example (PHP call base Stati
Topic link
MeaningThere are n numbers and q Q, and each query gives a positive integer k K, asking what number of K K is small in all numbers of n n numbers or combinations, and if not, output −1-1.
Ideas:First, the N-n number of the different or linear base is constructed.
Assuming that non 0 linear bases have a total of tot tot, the results of the first 1− (x−1) n (x-1) linear group, regardless of linear combination, are less than the X-X linear bas
A pure virtual function (pure virtual) is a method in a base class, just a declaration, not a definition, is a generalization concept (general concept);
is to put the corresponding virtual function, the end of the Add "= 0", the virtual function becomes a pure virtual function, you can not add a definition;
If it is another virtual function, it must be defined (define), even if it is not used;
A base cla
The simple base station positioning program describes how to obtain the current base station location in detail. The following is a brief summary:
In the Android operating system, base station positioning is actually very simple. let's first talk about the implementation process:
Call the API (telephonymanager) in the SDK to obtain information such as MCC, MNC,
I finally figured out the problem, why didn't the Cellid of the WCDMA base station obtained by Google map mobile edition, MobileTrack, and FieldTest of network optimization be the CellTrack91 or the number in the base station table... This problem is very difficult to say. I have known it before, but I have never studied it in depth, because it does not affect my use. But I was bored lying in bed before I w
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