Download Bulletproof Wireless Security: GSM, UMTS, 802.11 and Ad Hoc by Praphul Chandra PDF

By Praphul Chandra

Ultimately - a unmarried quantity advisor to actually potent safety for either voice and information instant networks!More and extra info and voice communications are going through instant at some point soon among the sender and meant recipient. accordingly, actually "bulletproof" instant defense is now greater than a fascinating characteristic - in its place, it is necessary to guard crucial own and enterprise facts from hackers and eavesdroppers.In this convenient reference, Praphul Chandragives you the conceptual and functional instruments each RF, instant, and community engineer wishes for high-security instant applications.Book assessment From EDN Magazine: this e-book youll locate insurance of those crucial topics:+Cryptographic protocols utilized in instant networks.+ Key-based protocols, together with key trade and authentication techniques.+ numerous sorts of instant community assaults, together with mirrored image, consultation hijacks, and Fluhrer-Mantin-Shamir (FMS) attacks.+ Encryption/decryption criteria and methods.+ Multi-layered safeguard architectures.+ safe sockets layer (SSL) and shipping layer safeguard (TLS) protocols.+ mobile phone community architectures and their vulnerabilities.+ Modulation innovations, reminiscent of direct-sequence unfold spectrum (DSSS) and orthogonal frequency department multiplexing (OFDM).And youll additionally locate assurance on such state-of-the-art themes as safety options for advert hoc networks andprotecting Bluetooth networks. If youre fascinated by instant safeguard, then this identify belongs in your reference bookshelf!"

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Additional resources for Bulletproof Wireless Security: GSM, UMTS, 802.11 and Ad Hoc Security

Example text

Confidentiality, as always, is obtained by keeping the keys (used to generate the pseudorandom string) secret. Note that the feedback mechanism is independent of both the plaintext and the ciphertext and is used in the pseudorandom string generation. The advantages of OFB are that it is fast (key-stream can be precomputed), does not require any padding and that errors in ciphertext cause limited errors in plaintext. The disadvantages are that it is not self-synchronizing and is susceptible to known plaintext attacks.

A and B agree on a cryptosystem (cipher to be used). 2. A and B agree on the key to be used. 3. A encrypts messages using the negotiated key and cipher and sends them to B. 4. B decrypts the ciphertext using the negotiated key and cipher. 3: Symmetric Key Cryptography The Achilles heel of symmetric key cryptography is that step 2 has to be carried out before the underlying channel has been made secure. Step 2 being carried out unsecurely means that if Eve gets access to the channel during this step, she can know the key that A and B decide to use.

The period of a key-stream generator refers to the time that it takes for regenerating the same key-stream. The security of the system lies entirely on the insides of the key-stream generator; for example, if the key-stream generator generates a stream of zeroes, the ciphertext is the plaintext. On the other hand, if the key-stream generator generates an endless stream of random bits, we have perfect security. For stream ciphers to work correctly, both the sender and the receiver must generate the exact same random number stream so that the sender can XOR it with the plaintext to obtain the ciphertext and the receiver can XOR it with the ciphertext to obtain the plaintext.

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