Collaborate Disseminate
The RFC3161 (https://www.ietf.org/rfc/rfc3161.txt) specification states
3. Transports
There is no mandatory transport mechanism for TSA messages in this
document. The mechanisms described below are optional; additional
optional … Continue reading What header & footer to use when storing RFC3161 token in PEM format
My question is about how to properly store RFC3161 tokens, so that their validity can be verified for a long time (aka "long term validation")
Let’s say I use an RFC3161 (https://www.ietf.org/rfc/rfc3161.txt) to timestamp data (n… Continue reading How to store RFC3161 token for long term validation?
I’ll formulate my question in regards to timestamped PDF, but I wonder actually about the long term validation of RFC3161 tokens in general.
So, PAdES has the concept of Long Term Validation, which means (correct me if I’m wrong), that a d… Continue reading What’s the merit of storing LTV (long term validation) information for RFC3161 tokens and what happens if a TSA private key would leak?
I’m writing a screenplay (just a spec script – not for money (yet)). I need to write a scene realistically enough so it doesn’t seem stupid. A little jargon is useful. It may be impossible, but here’s what needs to happen.
Criminals need t… Continue reading Plausible way to manipulate timecode on cctv [closed]
I want to measure the execution time of a function. The execution time of this function is only slightly different in the two cases. Is there any way I can accurately measure its time to distinguish the two cases?
The possible solutions ar… Continue reading In the time side channel, is there any way to improve the measurement time accuracy?
I am currently playing around with Mifare Classic 1k. And everything I have read about it’s security is true. So it’s not exactly the best thing to use to avoid cloning. But I was wondering if someone manages to hack one of these cards fol… Continue reading Best practice for encrypting data on Mifare
I’ve used OpenSSL cms to sign the data and generate a detached signature. As per my requirements, I need to timestamp the signature as well, so that if the certificate expired, verification of signature can be done. The generated timestamp… Continue reading Openssl cms verify signature with timestamp and crl
Years ago, I was running a service where the moderators were able to do various actions with massive privacy implications if the accounts or contributions were less than a short period of time. I did this by checking the timestamp against … Continue reading Is it safe to assume that my computer’s clock will always be synced with actual time within the second or a few seconds at the worst?
I’ve observed the practice of generating dedicated issuer CAs for signing TSU (Time-Stamping Unit) certificates instead of just using another existing issuer CA, for example, one used to sign S/MIME certificates or SSL certificates.
Now, … Continue reading Why generate dedicated issuer CA for TSU certificates?
Say, for example, I generate a time based UUID with the following program.
import uuid
uuid = uuid.uuid1()
print uuid
print uuid.time
I get the following:
47702997-155d-11ea-92d3-6030d48747ec
137946228962896279
Can I ge… Continue reading Is it possible to get the original UUID1 from a timestamp?