By Praphul Chandra
Finally--a unmarried quantity advisor to actually powerful safety for either voice and knowledge instant networks! progressively more facts and voice communications are going through instant at some point soon among the sender and meant recipient. consequently, really "bulletproof" instant defense is now greater than a fascinating feature--instead, it's necessary to guard crucial own and company facts from hackers and eavesdroppers. during this convenient reference, Praphul Chandra delivers the conceptual and useful instruments each RF, instant, and community engineer wishes for high-security instant functions. booklet evaluation From EDN journal: http://www.edn.com/article/CA632302.html?industryid=2817 inside of this publication you will discover insurance of those crucial subject matters: + Cryptographic protocols utilized in instant networks. + Key-based protocols, together with key alternate and authentication strategies + a variety of varieties of instant community assaults, together with mirrored image, consultation hijacks, and Fluhrer-Mantin-Shamir (FMS) assaults. + Encryption/decryption criteria and strategies. + Multi-layered safety architectures. + safe sockets layer (SSL) and delivery layer safeguard (TLS) protocols. + cellphone community architectures and their vulnerabilities. + Modulation innovations, resembling direct-sequence unfold spectrum (DSSS) and orthogonal frequency department multiplexing (OFDM). and you can additionally locate insurance on such state-of-the-art issues as safeguard thoughts for advert hoc networks and retaining Bluetooth networks. if you are occupied with instant safety, then this identify belongs in your reference bookshelf!
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Extra info for BULLETPROOF WIRELESS SECURITY: GSM, UMTS, 802.11, and Ad Hoc Security (Communications Engineering)
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.
In cryptography, authentication is achieved by using digital signatures or challengeresponse schemes. The former involves the sender digitally signing the message. If it 1 1 3 5 2 (K2) 4 (K1) E K1(K6) E K2(K3) 6 (Alice) (Eve) (Bank) Hint: Odd numbered keys are real. Even numbered keys are used by E for fraud. 1. When A and B agree on a cryptosystem (algorithm to be used), E notes this down. 2. B sends its public key (K1) to A. E notes this down but does not send this to A. 3. E generates an encryption-decryption key pair (K2,K4) and sends the encryption key, K2 to A.
A and B agree on a cryptosystem (cipher to be used). 2. B sends its public key to A. Let’s call this key K1. 3. A generates a random session key, K. , A transmits Ek1(K). 4. B decrypts the received message using its private key to obtain the session key, K. At this point both A and B (and only A and B) know the session key to be used for this transaction. 5. Both A and B use the session key for this session to communicate securely. 6: Hybrid Cryptography As seen above, hybrid cryptography uses PKC for key distribution but SKC for message encryption.