The time-sensitive tag has no wiki summary.
5
votes
2answers
228 views
What is the progress on the MIT LCS35 Time Capsule Crypto-Puzzle?
Ron Rivest posed a puzzle in 1999. MIT LCS35 Time Capsule Crypto-Puzzle.
The problem is to compute $2^{2^t} \pmod n$ for specified
values of $t$ and $n$. Here $n$ is the product of two large ...
3
votes
2answers
297 views
How does one calculate the cryptoperiod?
NIST Special Publication 800-57 defines a cryptoperiod as
the time span during which a specific key is authorized for use by legitimate entities, or the keys for a given system will remain in ...
2
votes
1answer
255 views
Self-expiring symmetric keys, or: cryptography in absence of secure deletion
I can encrypt some data D using a random symmetric key K, obtaining a ciphertext C, and then encrypt K with my public key Pub and obtain H. So far so good: I can only decrypt C if I have H and my ...
1
vote
4answers
315 views
Is it possible to make time-locked encrytion algorithm?
I'm not sure if what I'm asking is even a valid question but here goes.
Would it be possible to add a mechanism to an encryption algorithm that would mean it had to be a certain time of the day or a ...
4
votes
1answer
142 views
Is there an algorithm or hardware that can sign/verify natural time?
PGP/GPG can used to sign text, others use public key to verify them.
So one could say, that these cryptographic algorithms deal with space.
Are there any algorithms that can deal with time?
E.g. I ...
45
votes
14answers
3k views
Time Capsule cryptography?
Does there exist any cryptographic algorithm which encrypts data in such a way that it can only be decrypted after a certain period of time?
The only idea that I can think of, is something like this: ...
