Cover (telecommunications)

About: Cover (telecommunications) is a research topic. Over the lifetime, 4261 publications have been published within this topic receiving 30755 citations.

Portable electronic device case with cleaning accessory

Abstract: A case accessory for a portable electronic device that includes a cleaning system is disclosed. In some embodiments, the case accessory may include a back cover configured to secure a portable electronic device, a front cover rotationally coupled to the back cover, and a cleaning mechanism integrated into the front cover including a buffer configured to clean a surface of the portable electronic device.

Software usage authorization system with key for decrypting/re-encrypting/re-transmitting moving target security codes from protected software

Abstract: A computer based function control system is particularly suited for use as a software security device on the highly popular personal computers or a micro-processor driven function. The system includes an encrypted security message uniquely encoded at predetermined locations within the software or function program. The software or function program includes pre-set errors in it to cause failure of execution of the function or software program unless the errors are nulled during operation of the function or software program. A separate electronic key for retrieving, recognizing, decrypting, encrypting, and producing the null signals is connected to the communications port of the computer from which the key draws its power as well as the security message passed from the computer to the key and back to the computer. There is interchange of moving target and validation information between the computer software and the electronic key. This information is transferred via the security message under the cover of encryption and is monitored by the key and the software to insure that operation of the program can be effected only by authorized users of the function or software program (that is those having the key uniquely associated with that program).

Audio steganography using bit modification

Abstract: A method of embedding a covert audio message in a cover utterance for secure communication is presented. The covert message is represented in a compressed form with possibly encryption and/or encoding for added security. One bit in each of the samples of a given cover utterance is altered in accordance with the data bits and a key. The same key is used to retrieve the embedded bits at the receiver. The results, based on cover signals from a clean TIMIT utterance and a noisy aircraft cockpit utterance, show that the technique meets several major criteria for successful covert communication.

The ionosphere : communications, surveillance, and direction finding

Abstract: This introductory text describes the ionosphere and its effects on systems which use it, giving special emphasis to HF communications. Further sections cover topics such as the single station location of HF transmitters and over-the-horizon radar.

Portable telephone having a removable covering

Abstract: A portable telephone comprises a portable telephone body, and a body cover for covering the portable telephone body. The body cover is formed of a transparent acrylic resin and has the back side with various colors applied to, whereby the portable telephone can be used corresponding to scenes where the portable telephone is used. The body cover includes a battery cover unit which is independently removable, whereby it is not necessary to disassemble the entire body cover for battery replacement.