Network Security - Lecture 32protocol for secure network communications designed to be simple & inexpensive SSH1 provided secure remote logon facility replace TELNET & other insecure schemes also has more general client/server capability SSH2 fixes a number of security flaws documented in RFCs 4250 through 4254 SSH clients & servers are widely available method of choic...
60 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 764 | Lượt tải: 0
Network Security - Lecture 31Configure routers to filter network traffic Perform ingress filtering Configure traffic rate limiting (ICMP, SYN, UDP, etc) Deploy firewalls at the boundaries of your network The filtering system must be able to distinguish harmful uses of a network service from legitimate uses. Perform regular network vulnerability scans common and known...
50 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 744 | Lượt tải: 0
Network Security - Lecture 30runs on SSH Transport Layer Protocol assumes secure authentication connection used for multiple logical channels SSH communications use separate channels either side can open with unique id number flow controlled have three stages: opening a channel, data transfer, closing a channel four types: session, x11, forwarded-tcpip, direct-tcpip.
37 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 724 | Lượt tải: 0
Network Security - Lecture 29see RFC 4684- Analysis of Threats Motivating DomainKeys Identified Mail (DKIM) describes the problem space in terms of: range: low end, spammers, fraudsters capabilities in terms of where submitted, signed, volume, routing naming etc outside located attackers
31 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 806 | Lượt tải: 0
Network Security - Lecture 28It is safe to install these programs: Microsoft AntiSpyware (Defender) Spybot Search & Destroy SpywareBlaster SpywareGuard If you are running a different Spyware program contact your Technology Specialist to make sure it is not a rogue
42 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 716 | Lượt tải: 0
Network Security - Lecture 27Our discussion on more interesting topics on incorporating security in networks will continue. We will proceed to the last part of the course. The main concepts that will be discussed in this part are: Tools and techniques to protect data during the transmission over the Internet, Sobig F. worm, grappling Hook attack, Morris Internet worm, Overv...
27 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 775 | Lượt tải: 0
Network Security - Lecture 26Merchant possess DS, OI, message digest of PI (PIMD) and public key of customer, can compare the following two quantities H(PIMS||H[OI]) and D(PUc, DS) If both are equal merchant has verified the signature Bank possess DS, PI, message digest of OI (OIMD) and customer public key, can compute H(H[OI]||OIMD) and D(PUc, DS)
22 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 751 | Lượt tải: 0
Network Security - Lecture 25In today’s we talked about Kerberos as an authentication application. Its different versions were also discussed. We talked about one way, two way, and three way authentication in X.509 We also glanced how certificates are issued by CA.
34 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 825 | Lượt tải: 0
Network Security - Lecture 24A user gain access to a workstation and pretend to be another user from that workstation alter the network addr. of workstation, so that request sent will be appear from impersonate system may evasdrop on exchanges and use the replay attack to gain entrance to the server or to disrupt the operations Authentication at each server ?? Kerberos i...
26 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 751 | Lượt tải: 0
Network Security - Lecture 23The difference between Digital Signature Standard (DSS) and Digital Signature Algorithm (DSA) was also explored. We will talk about authentication applications We will study Kerberos which is an Authentication service developed at MIT
19 trang | Chia sẻ: dntpro1256 | Ngày: 20/11/2020 | Lượt xem: 809 | Lượt tải: 0
