Questions tagged [serial]

Either a serial port (physical) or an identifying number (digital), such as laptop's serial number or a certificate's serial number. For licensing, use the tag product-key.

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X509 “Serial Number of certificate” vs serial number attribute in Issuer and Subject?

Is the serial number attribute of an X509 certificate Issuer or Subject, as defined in RFC5280, required to be the same as the Serial Number of the issuing or subject certificate? It seems quite ...
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want to know best way to my case is to encrypt the UART communication channel? [closed]

I have device connected to scooter it’s 4- wire uart communication. My fear is some can read the ascii data and send the at commands and unlock my scooter and steal the scooter. I want to secure the ...
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How to securely generate a License tied to 1 Computer for each user

This question is related to my first question: How secure is this schema for Online Licensing System? I'm trying to sell a subscription based software and I can't find a good way to generate a serial ...
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How secure is a serial/terminal/console server, from the serial side?

I'm upgrading my home lab, and one of the things I'm planning on introducing this time is out-of-band management through a Raspberry Pi console server similar to this: https://www.packet6.com/...
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Feasibility of using serial port/cable to act as a simple data diode?

I'm trying to determine the feasibility of using a serial port/cable to act as a simple and cheap data diode. I'll be connecting 2 Windows PCs (1 of which is on a secured network) using a 1-way null ...
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How get serial number (or SHA1 Hash) certificate without private key? [closed]

I'm trying to get a serial number ( like $ssl_client_serial in nginx ) certificate without the private key and I don't know how to do it. I have drawn a scheme: client <- HTTPS -> HAproxy or ...
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0answers
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Is HID attack via UART (RS-232) possible?

I see there is a recent question about intrusion via USB here. Would it be similar to do an HID attack via the serial port (UART / RS-232)? Are there known examples? I can easily physically conduct ...
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1answer
3k views

openssl serial number error “SEC_ERROR_REUSED_ISSUER_AND_SERIAL”

I've been experimenting a bit with self-issued certificates. I set up a certificate authority, issued a certificate, and installed it on a webserver. I later deleted that certificate without ...
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Can I revoke a client certificate using only it's serial number (not it's crt/pem)?

I've signed and issued some client certificates with my CA. I can now revoke them like so: openssl ca -name ${CA_NAME} -revoke ${USERS_DIR}/${USERNAME}.crt -keyfile $SSL_PRIVATE_DIR/ca.key -cert $...
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Is there any way to determine the location of a laptop based on its MAC address or serial number?

If I have the MAC address and S/N of a Lenovo 3000 Laptop, is there some way for me to find exact street location of this laptop ? This machine was stolen from me last year and was my back up machine ....
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Why does the RFC 5280 dictate the CAs not to issue certificates with negative serial numbers?

I have tried to issue a certificate beginning with 8 to F but I have found it is impossible, mostly due to the RFC: The serial number MUST be a positive integer assigned by the CA to each ...