From nobelprize.org:
50 Year Secrecy Rule
The Committee does not itself announce the names of nominees, neither to the media nor to the candidates themselves. In so far as certain names crop up in the advance speculations as to who will be awarded any given year's Prize, this is either sheer guesswork or information put out by the person or persons behind the nomination. Information in the Nobel Committee's nomination database is not made public until after fifty years.
50 Year Secrecy Rule
The Committee does not itself announce the names of nominees, neither to the media nor to the candidates themselves. In so far as certain names crop up in the advance speculations as to who will be awarded any given year's Prize, this is either sheer guesswork or information put out by the person or persons behind the nomination. Information in the Nobel Committee's nomination database is not made public until after fifty years.