In the shadowy corners of the shortwave spectrum lurk the Numbers Stations: strange radio broadcasts of mysterious blocks of numbers in creepy monotone voices!

It's actually an old form of spycraft which is still in use today. And as it's #WorldRadioDay let's take a listen...

A Numbers Station is a type of one-way voice link for sending information to spies in foreign countries.

Operating on Short Wave radio bands they transmit a secret code of spoken numbers. Use of Numbers Stations peaked during the Cold War, but some are still operating today.
Numbers Stations are operated by various national intelligence agencies. At set times on a pre-arranged frequency a musical tone is played, followed by a speech synthesised voice reading out blocks of numbers. To most listeners it sounds both creepy and meaningless.
However to spies it can be vital. The numbers can be decoded to reveal a message, provided the spy has the right One Time Pad (OTP) - a random number key that is only used once before it is destroyed. OTP encryption is impossible to break if done correctly.
Why broadcast your secret message on Short Wave? Because it can be picked up across the globe. All a spy needs is a shop bought SW radio, a pencil, and the correct One Time Pad and they - and only they - can decipher the message. No complex kit is required.
For decades governments have denied running Numbers Stations, and for decades amateur radio enthusiasts have documented and recorded the stations to prove they do exist. It's only recently that more information about them has begun to emerge.
The Lincolnshire Poacher was a Numbers Station run by British Intellegence from Cyprus up until 2008. It played a minute of music before a female synthesised voice would read out 200 blocks of five digit numbers. Here's a clip: https://t.co/kcXDtPxrOD
Swedish Rhapsody was run by Polish Intelligence during the Cold War. It used a Stasi Sprach-Morse-Generator to synthesize a child's voice reading out number codes in German, preceded by a song from a music box. Here's how it sounded: https://t.co/f5nHnAEwLl
Gong was a Stasi run Numbers Station operating from East Germany. A series of gong strikes would be broadcast every half hour followed by the command "Achtung!" and the code number sequences. Here's a clip: https://t.co/KiiVA7jkGc
Not every Numbers Station broadcast numbers. Some stations, such as Whalesong, broadcast 'backwards music', a series of tones that would need to be recorded and deciphered by specialist equipment: https://t.co/tMTtrMVQ6F
UVB-76 isn't a Numbers Station, but it has continuously broadcast a series of buzzing sounds for 45 years across Russia. Is it just a channel marker, or could it be a 'Dead Hand' system to launch a nuclear retaliation if Moscow is destroyed? Hmm...: https://t.co/3nkZ2T4UEl
Numbers Stations may sound quaint, but they are still used today by many countries: a global signal with unbreakable encryption that is very hard to intercept - why reinvent a method that works?

More spy stories another time...

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प्राचीन काल में गाधि नामक एक राजा थे।उनकी सत्यवती नाम की एक पुत्री थी।राजा गाधि ने अपनी पुत्री का विवाह महर्षि भृगु के पुत्र से करवा दिया।महर्षि भृगु इस विवाह से बहुत प्रसन्न हुए और उन्होने अपनी पुत्रवधु को आशीर्वाद देकर उसे कोई भी वर मांगने को कहा।


सत्यवती ने महर्षि भृगु से अपने तथा अपनी माता के लिए पुत्र का वरदान मांगा।ये जानकर महर्षि भृगु ने यज्ञ किया और तत्पश्चात सत्यवती और उसकी माता को अलग-अलग प्रकार के दो चरू (यज्ञ के लिए पकाया हुआ अन्न) दिए और कहा कि ऋतु स्नान के बाद तुम्हारी माता पुत्र की इच्छा लेकर पीपल का आलिंगन...

...करें और तुम भी पुत्र की इच्छा लेकर गूलर वृक्ष का आलिंगन करना। आलिंगन करने के बाद चरू का सेवन करना, इससे तुम दोनो को पुत्र प्राप्ति होगी।परंतु मां बेटी के चरू आपस में बदल जाते हैं और ये महर्षि भृगु अपनी दिव्य दृष्टि से देख लेते हैं।

भृगु ऋषि सत्यवती से कहते हैं,"पुत्री तुम्हारा और तुम्हारी माता ने एक दुसरे के चरू खा लिए हैं।इस कारण तुम्हारा पुत्र ब्राह्मण होते हुए भी क्षत्रिय सा आचरण करेगा और तुम्हारी माता का पुत्र क्षत्रिय होकर भी ब्राह्मण सा आचरण करेगा।"
इस पर सत्यवती ने भृगु ऋषि से बड़ी विनती की।


सत्यवती ने कहा,"मुझे आशीर्वाद दें कि मेरा पुत्र ब्राह्मण सा ही आचरण करे।"तब महर्षि ने उसे ये आशीर्वाद दे दिया कि उसका पुत्र ब्राह्मण सा ही आचरण करेगा किन्तु उसका पौत्र क्षत्रियों सा व्यवहार करेगा। सत्यवती का एक पुत्र हुआ जिसका नाम जम्दाग्नि था जो सप्त ऋषियों में से एक हैं।