digital-signature

Does anyone know a free(trial) timestamp server service? [closed]

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You can try one of these publicly accessible RFC 3161 compliant time-stamping services: https://freetsa.org Supports HTTP, HTTPS and TCP transports and has other features http://time.certum.pl http://dse200.ncipher.com/TSS/HttpTspServer http://tsa.safecreative.org 5 free requests per day (may not be valid as root CA is ‘test’) – Safe Creative TSA is no longer active http://zeitstempel.dfn.de http://tsa.tecxoft.com Requires registration http://timestamp.comodoca.com/rfc3161 http://sha256timestamp.ws.symantec.com/sha256/timestamp … Read more

what is the difference between digital signature and digital certificate?

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A digital signature is used to verify a message. It is basically an encrypted hash (encrypted by the private key of the sender) of the message. The recipient can check if the message was tampered with by hashing the received message and comparing this value with the decrypted signature. To decrypt the signature, the corresponding … Read more

How does a public key verify a signature?

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Your understanding of “public keys encrypt, private keys decrypt” is correct… for data/message ENCRYPTION. For digital signatures, it is the reverse. With a digital signature, you are trying to prove that the document signed by you came from you. To do that, you need to use something that only YOU have: your private key. A … Read more