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NEW QUESTION 27
A number that is used only one time, then discarded is called what?
- A. Chain
- B. Nonce
- C. Salt
- D. IV
A nonce is an arbitrary number that can be used just once in a cryptographic communication. It is similar in spirit to a nonce word, hence the name. It is often a random or pseudo-random number issued in an authentication protocol to ensure that old communications cannot be reused in replay attacks.
NEW QUESTION 28
During the process of encryption and decryption, what keys are shared?
- A. User passwords
- B. Public and private keys
- C. Private keys
- D. Public keys
Public-key cryptography, or asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys, which may be disseminated widely, and private keys, which are known only to the owner. The generation of such keys depends on cryptographic algorithms based on mathematical problems to produce one-way functions. Effective security only requires keeping the private key private; the public key can be openly distributed without compromising security.
In such a system, any person can encrypt a message using the receiver’s public key, but that encrypted message can only be decrypted with the receiver’s private key.
Alice and Bob have two keys of their own – just to be clear, that’s four keys total. Each party has their own public key, which they share with the world, and their own private key which they well, which they keep private, of course but, more than that, which they keep as a closely guarded secret. The magic of public key cryptography is that a message encrypted with the public key can only be decrypted with the private key. Alice will encrypt her message with Bob’s public key, and even though Eve knows she used Bob’s public key, and even though Eve knows Bob’s public key herself, she is unable to decrypt the message. Only Bob, using his secret key, can decrypt the message assuming he’s kept it secret, of course.
Alice and Bob do not need to plan anything ahead of time to communicate securely: they generate their public-private key pairs independently, and happily broadcast their public keys to the world at large. Alice can rest assured that only Bob can decrypt the message she sends because she has encrypted it with his public key.
NEW QUESTION 29
The time and effort required to break a security measure.
- A. Payload
- B. Session Key
- C. Non-repudiation
- D. Work factor
Work factor – the time and effort required to break a security measure.
Non-repudiation – involves associating actions or changes with a unique individual.
Session Key – is a single-use symmetric key used for encrypting all messages in one communication session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or multicast key which refers to any key used for encrypting messages, contrary to other uses like encrypting other keys (key encryption key (KEK) or key wrapping key).
Payload – is the part of transmitted data that is the actual intended message. Headers and metadata are sent only to enable payload delivery.
NEW QUESTION 30
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