The compression unit compresses a voice signal. The user interface unit receives an information security request from a user, and displays whether or not information security is being performed. The information security attachment device includes a user interface unit, a compression unit, an encryption and decryption unit, and a conversion unit. Additional apparatus, systems, and methods are disclosed.Ībstract: An information security attachment device for voice communication and an information security method for voice communication using the same are provided. The amplified version may be received, and further activity may include transforming the transformed data into an estimate of acquired data, the transforming using at least one transform selected from a plurality of transforms according to an optimization metric calculation that operates on single, fixed-length packets of the transformed data and/or the estimate, and a preselected quality criterion threshold. Further activity may include transmitting an amplified version of an electrical signal in a geological formation, the electrical signal including the transformed data. Basically the scramblers are inserted between the audio inputs (microphone) and outputs (speaker) of the radio, so NO modifications to the radio are needed to make these units work.Of course the communication channel does not need to be wireless you could also connect these at your landline, or even at your smartphone if you use a 3-prong external audio jack.Abstract: In some embodiments, an apparatus and a system, as well as a method and an article, may operate to transform acquired data into transformed data using at least one transform selected from a plurality of transforms according to an optimization metric calculation that operates on single, fixed-length packets of the transformed data, and a preselected quality criterion threshold.
If you change the code on a regular basis, you become bulletproof.The units take 12V to 30 V DC supply voltage, which can either be connected via the front using an external DC power supply, or at the back using the battery box (the box takes ten “C” type standard batteries), NOT SUPPLIED with units.At you can find a ton of information about the MA4204 scrambler, as well as the pin connections for the hookups. That might seem low, but remember that a potential hacker would have NO knowledge of the pseudo random sequence, so even a single code would give you a lot of protection already. The PRNG itself can be controlled by three rotary switches located at the front panel, allowing for 512 different sequences.
The scrambling order of the time segments changes each half second and is controlled by a pseudo-random number generator (PRNG). The MA4204 uses a sophisticated time-division scrambling method.
There is NO way the average Joe will be able to crack these. They are narrow-band capable, so they will also work with SSB equipment.These units are digital scramblers, so this is NOT one of those cheap scramblers based on a simple voice inversion. These units are very rugged (metal case all around) and extremely simple to connect to ANY two-way radio.
The units are new, NOS (New Old Stock), never used not a scratch on them.
(so you will get TWO units when you win this). Racal MA4204 pair digital voice speech scramblers crypto military radio NEW OLD STOCK Description These are TWO military digital voice encryption units model MA4204, made by defense and aerospace manufacturer Racal Ltd. Item: 174892072931 Racal MA4204 military digital voice speech scrambler crypto radio NOS encryption.