Tài liệu miễn phí An ninh - Bảo mật
Download Tài liệu học tập miễn phí An ninh - Bảo mật
SecurityTools
cacls /T /E /G administrator:F d:\users\*.* Cacls will add Full Control for the adminsitrator account all files and subfolders in the Users folder of the D:\ drive. cacls /T /E /R Everyone d:\users Cacls will remove all permissions for the 'Everyone' group in all files and subfolders in the Users folder of the D:\ drive. Be sure to use the /E switch when you are just making modifications to a specific account or group. Without the /E switch, your settings will replace the current security with only what is specified. ...
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SELinux
Security-Enhanced Linux (SELinux) is an implementation of mandatory access control using Linux Security Modules (LSM) in the Linux kernel, based on the principle of least privilege. It is not a Linux distribution, but rather a set of modifications that can be applied to Unix-like operating systems, such as Linux and BSD.
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Simplified DES
Developed 1996 as a teaching tool Santa Clara UniversityProf. Edward Schaefer Takes an 8-bit block plaintext, a 10 –bit key and produces an 8-bit block of ciphertext Decryption takes the 8-bit block of ciphertext, the same 10-bit key and produces the original 8-bit block of plaintext
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SSL (Secure Socket Layer)
transport layer security service originally developed by Netscape version 3 designed with public input subsequently became Internet standard known as TLS (Transport Layer Security) uses TCP to provide a reliable end-to-end service SSL has two layers of protocols
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Symmetric Encryption Algorithms
Block ciphers are among the most widely used types of cryptographic algorithms provide secrecy and/or authentication services in particular will introduce DES (Data Encryption Standard)
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TCP/IP from a Security Standpoint
You don’t have to know all of the details You do need to know your system What services it is providing What protocols are involved What vulnerabilities is has How to minimize the risks
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TCP/IP - Security Perspective Upper Layers
Biggest problem is figuring out who a piece of mail is really from Must use a higher level mechanism for trust or privacy Most SMTP clients use sendmail which has been a constant source of security problems for years
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Viruses Worms
A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user. “a program that replicates by “infecting” other programs, so that they contain a copy of the virus”
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Virtual Private Networks CS - 480b dick steflik
Used to connect two private networks together via the Internet Used to connect remote users to a private network via the Internet This could be done by opening your firewall to the LAN networking protocols (NETBIOS, NFS NetWare, AppleTalk)) But… it would also make those protocols available to any one on the Internet and they could come into your LAN at will Effectively make the whole Internet your LAN Exposes all of your data Anyone can easily take advantage of vulnerabilities in your internal hosts No privacy Better solution is to use a VPN in conjunction with your firewall ...
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WebSecurity
Protect web content from those who don’t have a “need to know” Require users to authenticate using a userid/password before they are allowed access to certain URLs HTTP/1.1 requires that when a user makes a request for a protected resource the server responds with a authentication request header WWW-Authenticate contains enough pertinent information to carry out a “challenge-response” session between the user and the server
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Cryptography and Network Security Chapter 1
The art of war teaches us to rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable. —The Art of War, Sun Tzu
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Cryptography and Network Security Chapter 2
Many savages at the present day regard their names as vital parts of themselves, and therefore take great pains to conceal their real names, lest these should give to evil-disposed persons a handle by which to injure their owners. —The Golden Bough, Sir James George Frazer
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Cryptography and Network Security Chapter 3
All the afternoon Mungo had been working on Stern's code, principally with the aid of the latest messages which he had copied down at the Nevin Square drop. Stern was very confident. He must be well aware London Central knew about that drop. It was obvious that they didn't care how often Mungo read their messages, so confident were they in the impenetrability of the code. —Talking to Strange Men, Ruth Rendell
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Cryptography and Network Security Chapter 6
I am fairly familiar with all the forms of secret writings, and am myself the author of a trifling monograph upon the subject, in which I analyze one hundred and sixty separate ciphers, said Holmes. —The Adventure of the Dancing Men, Sir Arthur Conan Doyle
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Cryptography and Network Security Chapter 7
John wrote the letters of the alphabet under the letters in its first lines and tried it against the message. Immediately he knew that once more he had broken the code. It was extraordinary the feeling of triumph he had. He felt on top of the world. For not only had he done it, had he broken the July code, but he now had the key to every future coded message, since instructions as to the source of the next one must of necessity appear in the current one at the end of each month. —Talking to Strange Men, Ruth Rendell ...
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Cryptography and Network Security Chapter 8
The Devil said to Daniel Webster: Set me a task I can't carry out, and I'll give you anything in the world you ask for. Daniel Webster: Fair enough. Prove that for n greater than 2, the equation an + bn = cn has no non-trivial solution in the integers. They agreed on a three-day period for the labor, and the Devil disappeared. At the end of three days, the Devil presented himself, haggard, jumpy, biting his lip. Daniel Webster said to him, Well, how did you do at my task? Did you prove the theorem?' Eh? No . . . no, I haven't...
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Cryptography and Network Security Chapter 9
Every Egyptian received two names, which were known respectively as the true name and the good name, or the great name and the little name; and while the good or little name was made public, the true or great name appears to have been carefully concealed. —The Golden Bough, Sir James George Frazer
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Cryptography and Network Security Chapter 10
No Singhalese, whether man or woman, would venture out of the house without a bunch of keys in his hand, for without such a talisman he would fear that some devil might take advantage of his weak state to slip into his body. —The Golden Bough, Sir James George Frazer
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Cryptography and Network Security Chapter 11
At cats' green on the Sunday he took the message from the inside of the pillar and added Peter Moran's name to the two names already printed there in the Brontosaur code. The message now read: “Leviathan to Dragon: Martin Hillman, Trevor Allan, Peter Moran: observe and tail.” What was the good of it John hardly knew. He felt better, he felt that at last he had made an attack on Peter Moran instead of waiting passively and effecting no retaliation. Besides, what was the use of being in possession of the key to the codes if he never took...
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Cryptography and Network Security Chapter 12
Each of the messages, like each one he had ever read of Stern's commands, began with a number and ended with a number or row of numbers. No efforts on the part of Mungo or any of his experts had been able to break Stern's code, nor was there any clue as to what the preliminary number and those ultimate numbers signified. —Talking to Strange Men, Ruth Rendell
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Cryptography and Network Security Chapter 13
To guard against the baneful influence exerted by strangers is therefore an elementary dictate of savage prudence. Hence before strangers are allowed to enter a district, or at least before they are permitted to mingle freely with the inhabitants, certain ceremonies are often performed by the natives of the country for the purpose of disarming the strangers of their magical powers, or of disinfecting, so to speak, the tainted atmosphere by which they are supposed to be surrounded. —The Golden Bough, Sir James George Frazer ...
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Cryptography and Network Security - Chapter 14
will consider authentication functions developed to support application-level authentication & digital signatures will consider Kerberos – a private-key authentication service then X.509 - a public-key directory authentication service
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Cryptography and Network Security - Chapter 17
Web now widely used by business, government, individuals but Internet & Web are vulnerable have a variety of threats integrity confidentiality denial of service authentication need added security mechanisms
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Introduction of Trusted Network Connect
Root of Trust in a PC Operations or actions based on the TPM have measurable trust. Flexible usage model permits a wide range of actions to be defined. Doesn’t Control PC (About DRM) User still has complete control over platform. It’s OK to turn the TPM off (it ships disabled). User is free to install any software he/she pleases.
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Session Initiation Protocol (SIP)
SIP is a lightweight, transport-independent, text-based protocol. SIP has the following features: Lightweight, in that SIP has only four methods, reducing complexity Transport-independent, because SIP can be used with UDP, TCP, ATM & so on. Text-based, allowing for low overhead SIP is primarily used for VOIP calls
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Overview of Key Establishment Techniques: Key Distribution, Key Agreement and PKI
We now begin our look at building protocols using the basic tools that we have discussed. The discussion in this lecture will focus on issues of key establishment and the associated notion of authentication These protocols are not real, but instead are meant to serve just as a high-level survey Later lectures will go into specific protocols and will uncover practical challenges faced when implementing these protocols
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Part 2: Security functional components
This version of the Common Criteria for Information Technology Security Evaluation (CC v3.1) is the first major revision since being published as CC v2.3 in 2005. CC v3.1 aims to: eliminate redundant evaluation activities; reduce/eliminate activities that contribute little to the final assurance of a product; clarify CC terminology to reduce misunderstanding; restructure and refocus the evaluation activities to those areas where security assurance is gained; and add new CC requirements if needed....
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An ninh mạng - Nguyến Đại Thọ
Nhu cầu đảm bảo an ninh thông tin có những biến đổi lớn Trước đây Chỉ cần các phương tiện vật lý và hành chính Từ khi có máy tính Cần các công cụ tự động bảo vệ tệp tin và các thông tin khác lưu trữ trong máy tính Từ khi có các phương tiện truyền thông và mạng Cần các biện pháp bảo vệ dữ liệu truyền trên mạng
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SecurityProtocols
In the last lecture we looked at some high-level descriptions of key distribution and agreement schemes. These protocols cannot be used as they were stated. In implementation of the actual protocol, there are many situations one should be careful of. In this lecture, we will look at some common protocol failures that arise when trying to implement security protocols We will then look at some specific examples of security protocols
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Computer Security: The NIST Handbook
As our society grows ever more reliant on computers, so it also becomes more vulnerable to computer crime. Cyber attacks have been plaguing computer users since the 1980s, and computer security experts are predicting that smart telephones and other mobile devices will also become the targets of cyber security threats in the future.
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