Google says that Google+ now has over 170million registered users, but according a new research report of Fast Company about Google+,  Google+ is just a virtual ghost town.This research selected a sample of 40,000 random Google+ users. The result is :The average post on Google+ has less than one +1, less than one reply, and less than one re-shareRoughly 30% of users who make a public post never make a second oneEven after making five public posts, there is a 15% chance that a user will not post publicly againAmong users who make publicly viewable posts, there is an average of 12 days betw...

In Go, there is a type called slice which is built on top of array. It's a very convenient type when we want to handle a group of data. This post will explain a subtle but tricky difference between empty slice and nil slice.A nil slice is a slice has a length and capacity of zero and has no underlying array. The zero value of slice is nil. If a slice is declared like below, it is a nil slice.package mainimport "fmt"func main() { var a []string fmt.Println(a == nil)}The output will be true for above code snippet. An empty slice is a slice also has a length and capacity of zero but has unde...

Internet appears everywhere in our life. Form as a data gathering component is the must have component in a web app. When the page is submitting data to the server, if it takes a relative long time for the backend server to process the data, then the client users will feel lost while waiting for this if he cannot get any indication about what's happening. They may even reclick the button which will cause the data resubmission. This affects the user experience and also the system performance and stability.The solution to the above issue is we usually will disable the submit button or hide the s...

Guy Kawasaki is a Silicon Valley venture capitalist, bestselling author, and Apple Fellow. He was one of the Apple employees originally responsible for marketing the Macintosh in 1984. He is currently a Managing Director of Garage Technology Ventures, and has been involved in the rumor reporting site Truemors and the RSS aggregation Alltop. He is also a well-known blogger.We summarized 10 principles to start a new business from one of his presentations. 1. Make meaning in your companyThe most important purpose of starting a new company is to do something meaningful, not to earn money. If you m...

When we are coding we may often see some encoding specifications in our source codes such as UTF-8,GB2312. Do you know what these encoding mean and why we need them? In this post, Julián Solórzano will introduce the most widely used encoding specification around the world accomodating all different character sets in the world.UTF-8 is a method for encoding Unicode characters using 8-bit sequences. Unicode is a standard for representing a great variety of characters from many languages.Something like 40 years ago, the standard for information encoding ASCII was created. ASCII...

In an X509 certificate, the cRLDistributionPoints extension provides a mechanism for the certificate validator to retrieve a CRL(Certificate Revocation List) which can be used to verify whether the given certificate is revoked.  A cRLDistributionPoints extension can contain one or more DistributionPoints where the CRL can be retrieved from. Each DistributionPoint consists of three fields,each of which is optional:distributionPoint : it contains either a SEQUENCE of general names or a single value. One distributionPoint can contain one or more general names which show w...

When doing data exchange among different parties, there is a frequent need of encrypting data or file and sending it to partner and asking partner to use corresponding key to decrypt the data or file. A famous way of exchanging data is using asymmetric keys where no secret key needs to be shared. One party can just use the public key shared by partner to encrypt the data and the other party uses the private key to decrypt the data.Today, we will introduce how to use PGP to encrypt and decrypt data on MacOS. Pretty Good Privacy (PGP) is an encryption system used for both sending encrypted ...

BKS is a keystore format provided by the popular third party Java cryptographic library provider -- BouncyCastle. It is a keystore similar to the JKS provided by Oracle JDK. Before starting to use BKS, the BouncyCastle provider has to be downloaded and installed. To download the provider, please go to BouncyCastle download page. The provider can be installed by adding an entry in the java.security file.security.provider.N=org.bouncycastle.jce.provider.BouncyCastleProviderN means the provider index in the provider list.Creating BKS keystoreTo create a BKS keystore, you just need to create ...