• Cryptography & network security exercise 3Cryptography & network security exercise 3

    PKI - Public Key Infrastructure ▫ X.509 Authentication service ▫ Based on asymmetric cryptography ▫ Basic function - authentication of public keys ▫ Achieved by signing public keys ▫ Public key certificates issued by certifying authorities (CA) ▫ Permits different public key algorithms ▫ Revocation of certificates

    pdf17 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1020 | Lượt tải: 0

  • Cryptography & Network security exercise 2Cryptography & Network security exercise 2

    Others methods public BigInteger modPow(BigInteger e, BigInteger m) : a^e (mod m) public BigInteger modInverse(BigInteger m) throws ArithmeticException: public BigInteger shiftLeft(int n) public BigInteger shiftRight(int n)

    pdf24 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1003 | Lượt tải: 0

  • Cryptography & network security exercise 1Cryptography & network security exercise 1

    A generalization of the Caesar cipher (the affine Caesar cipher): For each plaintext letter p, substitute the ciphertext letter C: C = E([a, b], p) = (ap + b) mod 26 A basic requirement: one-to-one. That is, if p != q, then E(k, p) != E(k, q). The affine Caesar cipher is not one-to-one for all values of a. For example, for a = 2 and b = 3. •...

    pdf29 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1155 | Lượt tải: 0

  • Mạng máy tính - Chapter 7: Preparing the campus infrastructure for advanced servicesMạng máy tính - Chapter 7: Preparing the campus infrastructure for advanced services

    When planning for a video implementation, determine whether the video application is real-time video or on-demand video. Real-time video requires low latency and sends traffic in bursts at high bandwidth. When preparing for a video implementation such as TelePresence, consult with a specialist or expert to ensure the campus network meets all the r...

    pptx130 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1279 | Lượt tải: 0

  • Mạng máy tính - Chapter 6: Securing the campus infrastructureMạng máy tính - Chapter 6: Securing the campus infrastructure

    Security is a primary concern in maintaining a secure, stable, and uninterrupted network. Network security goes far beyond the information in this chapter and includes topics such as intrusion detection, firewalls, virus protection, and operating system patching. Unless you recognize and understand the importance of network security, your netwo...

    pptx115 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1242 | Lượt tải: 0

  • Mạng máy tính - Chapter 5: Implementing high availability and redundancy in a campus networkMạng máy tính - Chapter 5: Implementing high availability and redundancy in a campus network

    VRRP is similar to HSRP except that VRRP is an industry standard, whereas HSRP is a Cisco-proprietary protocol. GLBP is a Cisco-proprietary FHRP in which multiple routers not only act as backup default gateway routers but also share load in forwarding traffic, unlike HSRP and VRRP, where only the active router forwards traffic. Note that HSRP and V...

    pptx134 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1455 | Lượt tải: 0

  • Mạng máy tính - Chapter 4: implementing inter - Vlan routingMạng máy tính - Chapter 4: implementing inter - Vlan routing

    Using router-on-a -stick is an alternative and legacy method of implementing inter-VLAN routing for low-throughput and latency-tolerant applications. On multilayer switches, Layer 3 links can be aggregated using Layer 3 EtherChannels. When a Layer 3 interface is configured, routing can be enabled. DHCP functions can be configured on the switches....

    pptx70 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1249 | Lượt tải: 0

  • Mạng máy tính - Chapter 3: Implementing spanning treeMạng máy tính - Chapter 3: Implementing spanning tree

    The Cisco STP enhancements provide robustness and resiliency to the protocol. These enhancements add availability to the multilayer switched network. These enhancements not only isolate bridging loops but also prevent bridging loops from occurring. To protect STP operations, several features are available that control the way BPDUs are sent and rec...

    pptx80 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1265 | Lượt tải: 0

  • Mạng máy tính - Chapter 2: Implementing vlans in campus networksMạng máy tính - Chapter 2: Implementing vlans in campus networks

    A VLAN is a logical grouping of switch ports independent of physical location. Local VLANs are now recommended over end-to-end VLAN implementations. A trunk is a Layer 2 point-to-point link between networking devices carry the traffic of multiple VLANs. ISL and 802.1Q are the two trunking protocols that can connect two switches. VTP is used t...

    pptx79 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1227 | Lượt tải: 0

  • Mạng máy tính - Chapter 1: Analyzing the cisco enterprise campus architectureMạng máy tính - Chapter 1: Analyzing the cisco enterprise campus architecture

    Implementation Components: Description of the step Reference to design documents Detailed implementation guidelines Detailed roll-back guidelines in case of failure Estimated time needed for implementation Summary Implementation Plan – overview of implementation plan Detailed Implementation Plan – describes exact steps necessary to complete ...

    pptx26 trang | Chia sẻ: nguyenlam99 | Ngày: 09/01/2019 | Lượt xem: 1074 | Lượt tải: 0