Download Applied Cryptography for Cyber Security and Defense: by Hamid R. Nemati, Li Yang PDF

By Hamid R. Nemati, Li Yang

In todays details age, the protection of electronic conversation and transactions is of serious significance. Cryptography is the normal, but powerful, perform of concealing own info in our on-line world. utilized Cryptography for Cyber defense and protection: details Encryption and Cyphering applies the rules of cryptographic structures to real-world eventualities, explaining how cryptography can shield companies details and confirm privateness for his or her networks and databases. It delves into the explicit safety requisites inside a number of rising program parts and discusses systems for engineering cryptography into procedure layout and implementation.

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Sample text

Security is important, because the ability to modify such messages is equivalent to the ability to counterfeit arbitrarily-large amounts of money. Therefore, the banks might choose to be conservative, using the most thoroughly analyzed cipher available. By that reasoning, the most conservative cipher would be a symmetric cipher, the Data Encryp- Network Security tion Standard (DES). This cipher was approved by the US government three decades ago, and has received more public scrutiny than any other cipher in history.

It is tempting to think that if browsers always try to connect over port 443 first, and only connect only to port 80 as a last resort, we can avoid the MITM attacks mentioned here. Unfortunately, the attacker can simply drop the requests to connect to port 443 and make the browsers think that the web server does not offer HTTPS. While this defense might not help in all cases, by including into browsers a select set of sites for which service over HTTPS is known to exist, one can reduce the risk of MITM attacks.

She will tell Trent that she would like to communicate with Bob. Trent then generates a random key, called a session key, and sends it back to her. Alice’s message to Trent and his reply including the new key will both be encrypted with the key Alice and Trent share. Trent then sends a message to Bob, telling him that Alice would like to communicate with him, and sending him the same session key. This message is encrypted with a key shared by Trent and Bob. After that, Alice and Bob can communicate using the new key, and no further communication with Trent is needed.

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