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Governments may issue secret government subpoenas to communication providers that force them to disclose private data about their users or insert backdoors into their products. Furthermore, governments may give criminal penalties to an organization that chooses to publicly disclose if a subpoena was issued. Some tech organizations attempt to get around ...


39

If all parties can trust a common randomness beacon (like the NIST Randomness Beacon), this can be achieved by including a recent block from the beacon into the file along with its timestamp. The recipients then, in addition to verifying the signature, must also verify that the beacon data is authentic and as recent as they require. Other public random ...


14

Basically, it's a way to get around a restriction on disclosing a warrant has been served. Warrants authorize the seizing of items, including data. Many users want to know if their data has potentially been seized Warrant canaries have dates on them It can be against the law to disclose that one has received a secret subpoena or warrant (thank you to cat ...


6

In the US, many forms of government cooperation and compulsion are public. Some can be secret, or secret for a period of time. The general idea is that they are public. A company or person may wish to keep such assistance to the government secret or confidential, but there is often no requirement from the government to do so. However, in recent years, ...


2

I am not a lawyer and this answer is my opinion I couldn't find any legal authorities confirming or denying this, and I assume you speak about NSL-related canaries (those issued by courts to parties work differently). My apologies for a long answer but it looks necessary to explain some background to answer the question. First, National Security Letters (...


1

I don't see how the headline matches the post, so please allow me to go with the post and in accordance with the comments: One simple way to register the existence of a document or file is to use the blockchain. http://www.cryptograffiti.info/ - allows you to post anything, like a hash of the file along with a news headline, and it will be there forever, ...


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