Margaret Thatcher

Margaret Thatcher, the former British Prime Minister, used a method of invisible watermarking in the 1980s. After several cabinet documents had been leaked to the press, Thatcher ordered that the word processors being used by government employees encode their identity in the word spacing of the document. This allowed for disloyal ministers to be quickly found out.

Investigator's Guide to Steganography
Investigators Guide to Steganography
ISBN: 0849324335
EAN: 2147483647
Year: 2003
Pages: 220

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