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Answer for the clue "Spook: Obs ", 4 letters:
gost

Word definitions for gost in dictionaries

Wikipedia Word definitions in Wikipedia
The GOST block cipher , defined in the standard GOST 28147-89 , is a Soviet and Russian government standard symmetric key block cipher . The original standard did not give the cipher any name, however, the most recent revision of the standard, GOST R 34.12-2015 ...

Wiktionary Word definitions in Wiktionary
n. (obsolete form of lang=en ghost)