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seen Apr 16 at 13:44

Apr
1
revised Is substitution with random prefix codes secure?
deleted 300 characters in body
Mar
28
revised Is substitution with random prefix codes secure?
added 682 characters in body
Mar
20
revised Export from US of crypto software with key-size > 56 bits still needs permission?
added 5 characters in body
Mar
20
revised Export from US of crypto software with key-size > 56 bits still needs permission?
deleted 3 characters in body
Feb
2
revised Any efficient text-based steganographic schemes?
added 205 characters in body