etc samba smb conf the samba configuration file
securing voip networks - threats, vulnerabilities, & countermeasures
... threats and therefore directly affect the ALE value If one of these is halved, the total probability is halved Therefore, the mitigation factor can be added to the equation, giving the mitigated ... passwords are there Communication behavior is stored there The laptop also can eavesdrop on all behavior, including listening to the surroundings of the user of the laptop A mobile device of the future ... Still, in mobile telephony the device is authenticated using a SIM card and other tamper-proof hardware.4 But the user can not be authenticated to the network unless an authentication mechanism is...
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Cryptography and network security principles and practice, 5th edition
... motivate the material that is introduced, and the author considers this preferable to simply presenting all of the mathematical material in a lump at the beginning of the book INTENDED AUDIENCE The ... that confront the future of the Internet and is the organization home for the groups responsible for Internet infrastructure standards, including the Internet Engineering Task Force (IETF) and the ... The personnel manager sends a message to a server system to invalidate the employee’s account When the invalidation is accomplished, the server is to post a notice to the employee’s file as confirmation...
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Tài liệu COMPUTER AND NETWORK SECURITY IN HIGHER EDUCATION doc
... integrating the IDS with the firewall and renaming these intrusion prevention systems When a threat is identified, the IDS automatically works with the firewall to adjust the firewall rules to protect the ... Having these applications use the enterprise directory for authentication provides a single authoritative source for authentication across applications In the event the individual leaves the institution ... other sensitive information Today, switched Ethernet, which isolates traffic intended for one computer from the view of others on the same switch, is very inexpensive and, hence, it is worth the...
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Tài liệu Cryptography and Network Security Principles and Practices, Fourth Edition ppt
... message There is, however, another line of attack If the cryptanalyst knows the nature of the plaintext (e.g., noncompressed English text), then the analyst can exploit the regularities of the language ... example, if an entire accounting file is being transmitted, the opponent may know the placement of certain key words in the header of the file A s another example, the source code for a program ... signal, the function of the authentication service is to assure the recipient that the message is from the source that it claims to be from In the case of an ongoing interaction, such as the connection...
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Procedure 1610 PR.01 Systems and Network Security potx
... via the ISO; many of these programs open a direct route to your computer which may be used by others for direct access and many of these programs may directly share files on your computer to the ... Links: ITS 10 Use secure file transfer and configure file sharing securely File Sharing means you are allowing access to drives/directories/files on your local hard drive File sharing should be ... providers and their role in information security All faculty, staff, and students on campus have access to IT support staff Know who they are and the services they provide before you need them IT support...
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Computer and Network Security: Questions Everyone Should Ask docx
... store confidential data such as SSNs locally, how secure are the servers that house the information? Instead of storing personal confidential information locally, could we business in some other ... other modes of transmission)? • Do we educate our users about virus avoidance (e.g be wary of attachments in general, don’t run EXE files sent via email, etc. ) • Have we considered limiting the ... What we immediately? Would we remove the compromised system from the network? o What sort of investigation would we carry out to determine the nature of the attack, and what vulnerability was...
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Cryptography and Network Security docx
... Cryptography Fundamentals ● Privacy versus Authentication: – – ● Privacy: preventing third party from snooping Authentication: preventing impostering Two kinds of authentication: – Guarantee that no third ... Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 0913 May 2005 Cryptographic Authentication Eavesdropper Sender P C' Encryption C = SK(P) ● Network Key: K Decryption P' Receiver C' = S1K(P') The same system can also be used for authentication Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 0913 May 2005 ... Cryptanalysis ● Cryptanalysis: attacker tries to break the system – – ● E.g., by guessing the plain text for a given cipher text Or, by guessing the cipher text for some plain text Possible attacks:...
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Cryptography and Network Security Chapter 1 doc
... Introduction 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 ... Services (X.800) Authentication - assurance that the communicating entity is the one claimed Access Control - prevention of the unauthorized use of a resource Data Confidentiality –protection ... algorithm for the security transformation generate the secret information (keys) used by the algorithm develop methods to distribute and share the secret information specify a protocol enabling the principals...
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Cryptography and Network Security Chapter 2 pdf
... below it (again wrapping to top from bottom) otherwise each letter is replaced by the letter in the same row and in the column of the other letter of the pair Security of Playfair Cipher ... permutation ciphers these hide the message by rearranging the letter order without altering the actual letters used can recognise these since have the same frequency distribution as the original text ... long as the message Vigenère proposed the autokey cipher with keyword is prefixed to message as key knowing keyword can recover the first few letters use these in turn on the rest of the message...
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Cryptography and Network Security Chapter 6 pptx
... 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 ... 5] • means have data bytes, then bytes pad+count this may require an extra entire block over those in message there are other, more esoteric modes, which avoid the need for an extra block ... either be a fixed value (as in EFTPOS) or must be sent encrypted in ECB mode before rest of message Cipher FeedBack (CFB) message is treated as a stream of bits added to the output of the...
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Cryptography and Network Security Chapter 7 pptx
... Chapter – Confidentiality Using Symmetric Encryption John wrote the letters of the alphabet under the letters in its first lines and tried it against the message Immediately he ... 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 ... 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 Confidentiality using Symmetric...
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Cryptography and Network Security Chapter 8 doc
... 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 ... you prove the theorem?' "Eh? No no, I haven't proved it." "Then I can have whatever I ask for? Money? The Presidency?' "What? Oh, that—of course But listen! If we could just prove the following ... write it as a product of other numbers: n=a x b x c note that factoring a number is relatively hard compared to multiplying the factors together to generate the number the prime factorisation...
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Cryptography and Network Security Chapter 9 doc
... 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 ... computationally easy to en/decrypt messages when the relevant (en/decrypt) key is known either of the two related keys can be used for encryption, with the other used for decryption (for some algorithms) ... mod n, where 0≤M
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CIS 551 / TCOM 401 Computer and Network Security doc
... us? (But we trust them?) – We write the specification ourselves? (How we verify that the program meets the specification?) – We write the code ourselves? (But what fraction of the software you ... should the cards be stored? – What tradeoffs are there w.r.t usability? – What kind of authentication/access controls are there? 1/9/07 CIS/TCOM 551 34 #8: Hiding Secrets is Hard • The larger the ... Assumption (by programmer) is that the data will fit in the buffer – This leads to a vulnerability: Supply data that is too big for the buffer (thereby violating the assumptions) – Vulnerabilities...
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Cryptography and Network Security potx
... Introduction The art of war teaches us 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 ... Encrypt the key ! Third trusted party ! The sender and the receiver generate key " The key must be same CS595-Cryptography and Network Security Attacks ! Recover the message ! Recover the secret ... the sender and recipient (privacy or secrecy), and/or Verify the correctness of a message to the recipient (authentication) Form the basis of many technological solutions to computer and communications...
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The CERT® Guide to System and Network Security Practices pdf
... Until their customers demand products that are more secure, the situation is unlikely to change Users count on their systems being there when they need them and assume, to the extent that they ... exploit scripts was the exception rather than the rule By the year 2000, due to the widespread and easy availability of intrusion tools and exploit THE PROBLEM—IN THE LARGE cross site scripting High ... make the behavioral changes to comply with it The responsible executive must be sure to explain the motivation for the policy Peers, including those who participated in the development of the...
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Cryptography and Network Security: Overview potx
... (X.800) Authentication - assurance that communicating entity is the one claimed have both peer-entity & data origin authentication Access Control - prevention of the unauthorized use ... hosts on your local net (e.g., CSE571XPS and CSE571XPC2 in the security lab) to find their open ports Use network surveyor to show the map of all hosts on your local net Ping www.google.com to ... information Security services include authentication, access control, … Washington University in St Louis CSE571S 1-15 ©2011 Raj Jain Lab Homework Read about the following tools a Wireshark, network...
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Cryptography and Network Security Chapter 10 pptx
... temporary public key pair A sends B the public key and their identity B generates a session key K sends it to A encrypted using the supplied public key A decrypts the session key and both use problem ... used to exchange an arbitrary message rather it can establish a common key known only to the two participants value of key depends on the participants (and their private and public key information) ... keys each time they communicate users could create a known private/public D-H key and publish in a directory, then consulted and used to securely communicate with them both of these are vulnerable...
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Cryptography and Network Security Chapter 13 pot
... 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 ... disinfecting, so to speak, the tainted atmosphere by which they are supposed to be surrounded The Golden Bough, Sir James George Frazer Digital Signatures have looked at message authentication but ... early 90's published as FIPS-186 in 1991 revised in 1993, 1996 & then 2000 uses the SHA hash algorithm DSS is the standard, DSA is the algorithm FIPS 186-2 (2000) includes alternative RSA & elliptic...
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