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There were two main German cypher machines used during WW2:
There were two main German cypher machines used during WW2:
- The Enigma machine was used for low level tactical messages between units in the field. Messages were manually encrypted/decrypted using the machine and sent/received as radio telegrams. There were different versions of the Enigma used by the Army, Navy, Gestapo, SS, etc.
- The Lorenz machine was used to send high level strategic messages between high command and the various generals. Messages were automatically encrypted/decrypted using a standard Baudot teletype for input/output and automatically transmitted/received. There were four different versions of the Lorenz machine (SZ40, SZ42, SZ42A and SZ42B) introduced at different times in the war to improve its security.
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Radio waves being electromagnetic does not need any material medium to get transferred. With high frequency known to be carrier wave this is able to reach far distance. But th…is carrier wave is to carry the signal to be communicated. The signal may be audio or video or any other digital. This would modulate the carrier wave by changing any of the characteristic of the carrier wave namely amplitude, frequency or phase. The modulated carrier wave as it gets transmitted will be received at a far place and demodulated or the signal is detected right from it. This is how radio waves now a days known as micro waves are so helpful in communication systems.
The Caesar cipher is far more easier to break, as it consists of a single shift operation with a total number of 25 keys. Caeser can be cracked within less than a second… by brute force (trying all possible keys). For the enigma machine you have to know which rotors are being used in which order, the initial rotor position, the ring position and the plugboard configuration. With cryptoanalytic approaches Enigma can be cracked as well in decent time. Nevertheless the key space (amount of possible keys) is so large, that simple brute forcing will take a while.
A technician wishes to secure the network authentication for all remote users Which security technology uses radio communication with a computer before accepting a username and password?
A technician wishes to secure the network authentication for all remote users. Key fobs is a security technology that uses radio communication with a computer before accep…ting a username and password.
radio waves transmmit in a particular frequency when a receiver set on particular frequency that catch the information or data of that waves may be contain
Which type of security threat uses a low-power radio signal to cut off communication from a cell phone to a base station?
Jamming Answer Explanation: A jammer can be used to cut off the communication between a cell phone and a base station. Cell phones use radio signals to transmit and receive c…alls through the air. Jamming is accomplished by confusing the cell phone into thinking that there is no base station available to service it.
the German machine gun was the MG 34 and MG42 the MP-38 and MP-40 was the sub-machine gun
A radio programme receiver does not need to be directly in view of the transmitter to receive programme signals. For low frequency radio waves diffraction can allow them to be… received behind hills, although repeater stations are often used to improve the quality of the signals.
it is used for the communication
What is the difference between an unconditionally secure cipher and a computationally secure cipher?
unconditional security no matter how much computer power or time is available, the cipher cannot be broken since the ciphertext provides insufficient information to uniquely… determine the corresponding plaintext computational security given limited computing resources (eg time needed for calculations is greater than age of universe), the cipher cannot be broken
The German ENIGMA coding machine was used to communicate orders from Germany to its deployed U-boats. Early in WWII, the failure to break the ENIGMA code helped lead to signif…icant losses in the Battle of the Atlantic. The Germans believed that the ENIGMA code was unbreakable. The first break for the Allies came when the British destroyer HMS Bulldog successfully boarded and captured an ENIGMA machine and its code books from the German U-boat U-110 in May, 1941. The capture of the ENIGMA machine significantly aided efforts by cryptoanalysts at Bletchley Park in England, where the main British code decryption efforts were being conducted. Eventually Bletchley Park was able to successfully build a computer that would decode all German Naval communications. This feat, as well as the Allies' success at keeping the knowledge from the Germans that ENIGMA had been captured and broken, led to the major downturn for German U-boats in the Atlantic. By the end of the war, German U-boat losses were 70%.
Well, let's think about a few other things that could be used to communicate from place to place: String with tin-cans or ice-cream-cups on each end: Low-quality communica…tion. Works only when string is tight and dry. Capacity of only one voice per string. Analog only, no digital. Hard to install around corners. Hard to build repeaters to "boost" signals over long distances. Wires: Rugged, excellent high quality communication. Can carry maybe 30 voice-quality channels, or 1 or 2 music-quality channels, or 1 or 2 DSL internet channels, all on one pair of wires. For more than that, you have to run more wires. Many such wired networks exist right now. They're called "telephone companies". Every time you want to add communication with 1 new person, you have to run new wires to him. That's why, in many countries around the world, cellular service is growing much faster than "land-line" service ... if you want a phone, you don't have to wait until the telephone company can bring wires to your house. Optical Fiber: Rugged, excellent, high-quality, high-capacity communication. Can carry more voice-quality, music quality, and high-speed data channels than you can imagine, all at the same time. To get fiber to reach everyone, new cables have to be physically hung from poles or buried in the ground, all the way from some kind of central office to every individual house ... essentially building the whole telephone network all over again from the ground up. They're working on it, but it'll take some time. Wouldn't it be much easier if we had a way to communicate over distances without installing some physical "pipe" every inch of the way between the end points ... without string, wires, fiber, etc., just a jump, from here to there ? ! Well, here are a few possibilities: Sound: Put up big rock-band speakers on top of a tall building in the middle of town, and broadcast the music, news, weather, and commercials through them. Anybody who lives close enough can hear it clearly, just like radio, but they can do it with the receivers they were born with, and they don't need any special equipment. Problems: => Thunderstorms interfere with reception. Just like AM radio, only worse. => No way to separate, just like at a loud party. More than 3 or 4 stations in town, nobody can receive anything, because of extreme "co-channel interference". => Limited capacity: 1 audio channel, no digital, all one-way, no return-channel. => Nobody gets any sleep. No ON/OFF switch. Visible light: Good idea. "Fiber without the fiber", just a beam of modulated light. Works fine. Until rain, snow, birds, or a tall truck blunder across the beam. Radio: Without going into a lot of detail or belaboring the point ... you pretty well know what's being done with radio now and what it's capable of. If you feel that any of the other methods considered above is a more effective way to accomplish our communication, or you know of some other method that hasn't been mentioned that can do the job better, faster, cheaper, and easier than radio, then please! By all means! Let's hear about it.
Before and during WWII.
What type of security threat uses modified radio scanners to capture communication and listen to your phone conversations?
There used to be available both portable and desktop programmable scanners available that covered cell phone frequencies. (I have one). They are no longer available from norma…l dealers like Radio Shack, etc. A few bucks in parts and a connecting cable would allow you to record any call intercepted. Could get you cost you too, $ or jail time! They didn't recall those previously sold but the Feds get uptight about miss use of those in public use. I use mine to monitor public service channels. Police, Search and Rescue, even the Airport and Air to Air/Ground frequencies. from an old sergeant
Continuously from the 1890s until now.
Like HTTP over SSL - HTTPS protocol, FTP has designed to support SSL in FTP7 - FTPS protocol. Also Secure child element is included to enhance security configuration in FTP7.
Communications security is used to prevent unauthorized interceptors from accessing telecommunications. It also controls traffic flow security and emission security.