As Solar Cycle 25 peaks, learn how increased sunspots and ionospheric ionization are boosting shortwave radio propagation.
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Abstract: This paper studies long-range radio communication by analyzing both terrestrial and ionospheric propagation models. For terrestrial communication, the Friis free space model and the two-ray ...
North Korean threat actors have been observed sending phishing to compromise targets and obtain access to a victim's KakaoTalk desktop application to distribute malicious payloads to certain contacts.
Abstract: The use of powerful low or very low frequency (LF/VLF) transmitter signals (mainly in the range 15-60 kHz) is a well established technique for remote sensing of the lower ionosphere.
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