information security principles and practice

be Su or sudo (recommended) to obtain root level access, so you can get the full audit information, who through sudo on the system to execute the privileged command will be clear3. Use only SSH v2The first version of the SSH protocol (SSH v1 or SSH-1) has a man-in-the-middle attack problem and security vulnerability that has been invalidated and should be avoided using SSH v11. vim/etc/ssh/sshd_config22Thi

operator:First, the destructor of the vector is activated; The constructor activates the destructors for these elements (if they have destructors), and then releases the memory used by those elements.Then, release the memory used by the vector.Type blending: untyped pointers and pointer type conversionsWe are very close to the hardware level when using pointers to free-space allocation arrays. Basically, we map the operation of pointers (initialization, assignment, * and []) directly to machine

collected in two steps:Goals:The targets we mentioned here are generally divided into two types: first, they have clear attack targets and motivations, and the other is random scanning, with no clear attack awareness in advance, it is only for some reason.Collect specific information:It can be roughly divided into two aspects: first, the powerful system security detection software is used to perform multi-faceted

We all know that adherence to design principles is an important basis for developing high-quality software, but it is not easy to use in practice. Booch proposes four basic principles in Abstract core idea is the concept of invariance. Remove attributes that you don't care about, and reinforce important attributes to help people think about what to do. The

time of the download thread (in Sec) • Io. sort. factor • default value 10 • Org. apache. hadoop. io. compress. defaultcodec • mapred. job. shuffle. input. buffer. percent • default value 0.7 • Percentage of reduce task heap used to cache shuffle data • mapred. job. shuffle. merge. percent • default value 0.66 • Percentage of cached memory before performing merge operations • mapred. job. reduce. input. buffer. percent • default value 0.0 • Percentage of data cached in the reduce computing phas

http://blog.csdn.net/horkychen/article/details/50486268We all know that adherence to design principles is an important basis for developing high-quality software, but it is not easy to use in practice. Booch proposes four basic principles in Abstract core idea is the concept of invariance. Remove attributes that you don't care about, and reinforce important a

other.Suppose we choose the attribute R as the split attribute, DataSet D, R has K different values {v1,v2,..., Vk}, so d according to the value of R into K-group {d1,d2,..., Dk}, after splitting by R, the amount of information required to separate the different classes of DataSet D is:information gain is defined as before and after the split, two of the amount is only poor:The following example uses Python to illustrate a decision tree construct usi

Baptism of the soul, practice python (3) -- expose coding problems, operating principles and syntax habits from a simple print code, pythonprint After the preliminary work is ready, you can open the IDE editor. You can select the built-in python IDLE or a third party. Here I use pycharm-an IDE dedicated to python. By convention, "hello, world" is required for printing the first python code in all developmen

@override inside the retention set to source, compiled successfully do not have the information of these checks, on the contrary, @Deprecated inside the retention set as runtime, This means that in addition to being warned at compile time which deprecated method is used, it is possible to find out whether the method is deprecated when executed.3) @DocumentedInclude this note in the Javadoc4) @InheritedAllow subclasses to inherit annotations from pare

the user's knowledge. In this leaked incident, Facebook was blamed for sharing user data with third parties, without limiting and guaranteeing that the data was not abused by third parties. Attention 3 "An emphasis on cancellation of accounts" In addition to emphasizing the user's rights in the above-mentioned personal information processing activities, the specification also states that the user also has the right to access, correct, delete, withdra

Martin 12 agile practices are the characteristics of agile practices that distinguish them from heavy processes.1. Our top priority is to satisfy our customers by delivering valuable software as soon as possible and continuously.MIT Sloan Management comment published a paper that analyzes software development practices that help companies build high-quality products. This paper finds many practices that have an important impact on the final system quality. One

12 agile practices are the characteristics of agile practices that distinguish them from heavy processes.1. Our top priority is to satisfy our customers by delivering valuable software as soon as possible and continuously.MIT Sloan Management comment published a paper that analyzes software development practices that help companies build high-quality products. This paper finds many practices that have an important impact on the final system quality. One prac