MRHS Event January 20, 2024
Wednesday, January 10, 2024
(January 26, 2024: This promotion has already ended!)
Maritime Radio Historical Society
The Maritime Radio Historical
Society, in cooperation with our good friends at the Cipher History
Museum, present a unique, over-the-air cryptographic
challenge.
On January 20 2024, KPH will transmit a coded
message consisting of 5-digit groups. The message will be encrypted
using typical Cold War numbers station cryptographic procedures.
All KPH listeners are invited to try their hand at receiving and
decrypting the message. Certificates will be awarded to those
who successful decode the message. Additionally, a special
certificate will be awarded to the first person to decode it.
Background
"Numbers Stations? It's said that they're relics from the Cold
War; a way for various intelligence services to communicate with
agents in the field. The truth... well, you're not actually cleared
for what the truth is." - Agent Johnson, Fugue
State
During the Cold War era, 'Numbers Stations' were frequently heard
on the shortwave bands by radio amateurs and SWLs. Using voice or
Morse code, these stations would broadcast encrypted messages in
the form of five-letter groups of numbers.
Although the Cold War has ended (has it?), there are still active
numbers stations and new ones keep appearing, broadcasting covert
messages from secret and officially non-existing radio
installations. Who is listening to them? That remains a
mystery.
The encryption methods used by number stations are widely believed
to use a one-time pad (OTP) procedure: the simple addition (or
subtraction) of a set of random numbers from the OTP to encode (or
decode) the cleartext. Once used, the OTP key was never re-used and
destroyed after use. Number stations still offer a powerful
advantage in our modern world: provably unbreakable security and
complete anonymity. All the recipient needs are the OTP, a
shortwave radio, and to be on the right frequency at the right
time.
You say your tradecraft procedures are a bit rusty? Perhaps you
have mislaid your code book? Normally you'd be recalled, and
provide explanations once you return to Langley. However, there's
good news! MRHS is here to help. At great cost, we have managed to
intercept a copy of the OTP that was used to encode the message.
Please find the link below for the decode procedure and further
information.
Numbers Broadcast: Date, Time and Formats
The numbers broadcast will commence at 2100Z (1300 PST) on
20 January 2024 on all KPH CW and RTTY
frequencies. The CW frequencies are (in kilocycles): 425.0, 6477.5,
8642.0, 12808.5, 17016.8, and 22477.5 . Upon completion of the CW
transmission, the broadcast will be repeated using RTTY (170cps
shift, 45 baud) on the following frequencies: 6324.5, 8427.0 and
12585.5 kcs.
Certificates
Certificates of Cryptographic Excellence will be awarded upon
proof of successful decode of the Numbers Message. A special
certificate will be awarded to the first Agent to manually decode
the message (i.e. using pen and paper, without the use of a
computer program).
Rules for Certificates
1. 72-hour time Limit: Numbers
messages are time-sensitive! Your decoded message must be received
at the email address below within 72 hours
(i.e.
before 2000Z (1300 Pacific) on 23 January 2024.
2. Group Efforts: While MRHS
encourages group efforts, only one certificate will be awarded per
group.
3. The Numbers Message is
top-secret! Please do not share the encoded Numbers Message or
decrypted message before the 72-hour time-limit has expired.
Only apply
for a certificate if you or your team have actually received the
message over the air (or on a web-based SDR) and decrypted the
message yourself.
To apply for a certificate, send email to crypto@radiomarine.org
with the subject line 'Decoded Numbers Message'. Please include the
following:
· The decoded
message in plaintext, properly re-formatted into words.
· The frequency
and location where the Numbers Message intercepted. Signal reports
are encouraged!
· The exact name
you wish to have on your certificate.
Certificates of 'Cryptographic Excellence' will be awarded to all
Agents who demonstrate a successful decode of the Numbers Message.
These certificates will be emailed in digital form suitable for
printing at home. A special hand-signed certificate, embossed
with the MRHS seal, will be awarded for 'First-to-Decode'. This
award will be based on the timestamp of the first email
demonstrating a successful decode.
Instructions for decoding the Numbers
Message
For helpful instructions on decoding numbers messages and related
one-time pad procedures, please visit the Mission
Critical Information page
IMPORTANT: in
addition to the above instructions, you will also need three items:
the one-time pad (OTP), a conversion chart and the codebook. These
items are available at the Mission
Critical Information page
Further Information
For more information or questions about the KPH Numbers Broadcast
send email to crypto@radiomarine.org.
VY 73 es GL
Maritime Radio Historical Society