In The
ciphers of Czechoslovakia’s government in exile I’ve added the following in
the paragraph ‘Report on the compromise of the communications of the government
in exile’:
The report ‘Dopady lúštenia šifrovacieho systému čs.
londýnskeho MNO z rokov 1940-1945 na domáci odboj’, can be found in the
archive of the Museum of the Slovak National
Uprising in Banská Bystrica and in the Central Military Archive at Prague.
In the report
Cigan analyzed the Czechoslovak STP cipher and found it insecure. In addition
he proved the compromise of Czechoslovak ciphers by examining reports from the
office of the high ranking SS official Karl Hermann Frank.
A report from
November 1944 had a summary of Funkwabwehr (Radio Defense) operations and it
said that during the previous month 8 radio links, whose cipher procedures
could be solved, were kept under observation. Of special interest was traffic
between the Protectorate and London regarding the preparations for the uprising.
In the month
of October a total of 488 messages were solved and 8 cipher keys derived for
the STP cipher.
In pages
37-41 Cigan directly compared the Funkawbehr decodes with some of the
Czechoslovak telegrams found in the country’s national archives.
For example
messages exchanged between the Minister of National Defense General Ingr and Ján Golian and Jaroslav Krátký
in the Protectorate and with Heliodor Píka in
Moscow.
The author’s
conclusion was that the use of insecure ciphers during wartime played an
important role in undermining the operations of the Czechoslovak resistance movement
and these events should be acknowledged by the country’s historians
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