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NEW QUESTION 48
In IPSec, if the VPN is a gateway-gateway or a host-gateway, then which one of the following is true?
- A. Encapsulating Security Payload (ESP) authentication must be used
- B. Only the tunnel mode can be used
- C. Only transport mode can be used
- D. IPSec does not involve gateways
IPSec has two different modes: transport mode and tunnel mode.
Only the tunnel mode can be used
In tunnel mode, the entire IP packet is encrypted and authenticated. It is then encapsulated into a new IP packet with a new IP header. Tunnel mode is used to create virtual private networks for network-to-network communications (e.g. between routers to link sites), host-to-network communications (e.g. remote user access) and host-to-host communications (e.g. private chat).
Encapsulating Security Payload (ESP) authentication must be used. ESP in transport mode does not provide integrity and authentication for the entire IP packet. However, in Tunnel Mode, where the entire original IP packet is encapsulated with a new packet header added, ESP protection is afforded to the whole inner IP packet (including the inner header) while the outer header (including any outer IPv4 options or IPv6 extension headers) remains unprotected.
IPSec does not involve gateways. Wrong.
Only transport mode can be used. Transport mode, the default mode for IPSec, provides for end-to-end security. It can secure communications between a client and a server. When using the transport mode, only the IP payload is encrypted.
NEW QUESTION 49
Manipulating individuals so that they will divulge confidential information, rather than by breaking in or using technical cracking techniques.
- A. Replay attack
- B. Social engineering attack
- C. Side-channel attack
- D. Linear cryptanalysis
Social engineering attack
Social engineering is the psychological manipulation of people into performing actions or divulging confidential information. This differs from social engineering within the social sciences, which does not concern the divulging of confidential information. A type of confidence trick for the purpose of information gathering, fraud, or system access, it differs from a traditional "con" in that it is often one of many steps in a more complex fraud scheme.
Replay attack - (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and re-transmits it, possibly as part of a masquerade attack by IP packet substitution. This is one of the lower tier versions of a "Man-in-the-middle attack." Side-channel attack - is any attack based on information gained from the implementation of a computer system, rather than weaknesses in the implemented algorithm itself (e.g. cryptanalysis and software bugs). Timing information, power consumption, electromagnetic leaks or even sound can provide an extra source of information, which can be exploited.
Linear cryptanalysis - is a general form of cryptanalysis based on finding affine approximations to the action of a cipher. Attacks have been developed for block ciphers and stream ciphers. Linear cryptanalysis is one of the two most widely used attacks on block ciphers; the other being differential cryptanalysis.
NEW QUESTION 50
Storing private keys with a third party is referred to as what?
- A. Key caching
- B. Key banking
- C. Key storage
- D. Key escrow
Key escrow (also known as a "fair" cryptosystem) is an arrangement in which the keys needed to decrypt encrypted data are held in escrow so that, under certain circumstances, an authorized third party may gain access to those keys. These third parties may include businesses, who may want access to employees' secure business-related communications, or governments, who may wish to be able to view the contents of encrypted communications (also known as exceptional access).
NEW QUESTION 51