How To Protect SSH with Fail2Ban on Ubuntu 14.04

Introduction

While connecting to your server through SSH can be very secure, the SSH daemon itself is a service that must be exposed to the internet to function properly. This comes with some inherent risk and creates a vector of attack for would-be assailants.

Any service that is exposed to the network is a potential target in this way. If you pay attention to application logs for these services, you will often see repeated, systematic login attempts that represent brute force attacks by users and bots alike.

A service called fail2ban can mitigate this problem by creating rules that can automatically alter your iptables firewall configuration based on a predefined number of unsuccessful login attempts. This will allow your server to respond to illegitimate access attempts without intervention from you.

In this guide, we’ll cover how to install and use fail2ban on an Ubuntu 14.04 server.

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区块链会导致什么样的诈骗风险与隐私问题?By Jim Thackston

数据区块链的潜力很大,但是公司必须认识到潜在的欺诈行为以及反欺诈措施对隐私造成的威胁。

推动比特币发展的区块链技术,本质上是不可篡改的分散式交易数据库。它经过不同的检验者核实认证,向所有开放。区块链技术的目的是确保任何人都不能修改之前的交易记录。

单从技术角度来看,区块链很好地实现了这一点。到目前为止,区块链的前景固然可观,但是它也有致命缺点,导致它在应对欺骗、盗用和法律风险时要付出巨大代价。这些问题亟待解决。有几种方法可以解决欺骗问题,但是某些解决方法却也会衍生其它问题。

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[转载]AI修图艺术:Prisma背后的奇妙算法

在Prisma的应用下载评论区看到这么一句好玩的话:世界一半人在用《PokemonGO》抓精灵,另一半人在用这个软件修图。

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