Questions tagged [signature]

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Why am I not able to independently verify that a developers personal key has been signed by a master key?

It says here that there are 5 Master signing keys for the Arch Linux project. It also says that active, trusted developers have their keys signed by one or more of the master keys. And we can see that ...
9 votes
2 answers
14k views

“The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 23F3D4EA75716059”

I try to update Debian but I get the following error message: % sudo aptitude update Hit http://deb.debian.org/debian bullseye InRelease Hit http://deb.debian.org/debian-security bullseye-security ...
1 vote
1 answer
2k views

Openssl signed with openssl pkeyutl verified with openssl dgst

I want to sign hash with openssl pkeyutl and verify with openssl dgst -verify. Down below are my testing private and public keys (EC keys): private.pem: -----BEGIN EC PARAMETERS----- BggqhkjOPQMBBw=...
0 votes
0 answers
241 views

can't verify signature error occuring while updating my office 365

while trying to update my pc with office 365 .can't verify signature message is popping up. i tried uninstalling and installing the software .After performing sfc scan KB63363901 .that problem was ...
0 votes
0 answers
225 views

Renew a self-signed certificate

Let's say I have a self-signed X.509 certificate: file some.bin some.bin: Certificate, Version=3, Serial=00ea5db390c4cc0de3, Issuer=Some Certificate, not-valid-before=2022-08-02 06:51:44 GMT, not-...
0 votes
1 answer
822 views

Signature in Front is getting resized in Outlook

I am trying to create a signature in front. I was able to insert the image by saving it on the computer and uploading it. After messing around with the formatting it looks fine on Front. The problem ...
0 votes
1 answer
126 views

How reliable is Window's verified publisher system?

I assume anyone can with some effort add their certificate under name X to their database, in that case, is there anything stopping a fake publisher from adding themselves with the name of a legit ...
0 votes
0 answers
34 views

What does it mean when the publisher of an application is identified as Microsoft Corporation but then it is flagged as not verified?

I am using this utility called SysInternals which is like the task manager on steroids for the Windows operating system. I noticed that the publisher of certain applications is labelled as Microsoft ...
8 votes
1 answer
8k views

Generating JWT RS256 signature with openssl

I'm trying to sign a JWT token with the RS256 algorithm using openssl. Take the following example token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9....
2 votes
0 answers
192 views

Thunderbird Signature Switch - Sync signatures between different devices

When composing a message in Thunderbird I would like to easily turn on/off and choose between signatures but also sync my signatures between different devices. So far the Signature Switch add-on in ...
0 votes
1 answer
978 views

Gpg4win installer signature validation: how to fix "WARNING: This key is not certified with a trusted signature!"

I am following the install guide of "OpenPGP signatures" of Gpg4win at Check integrity of Gpg4win packages. Having also followed additional advice of how to import the Gpg4win public key ...
35 votes
11 answers
75k views

How can I sign a PDF document quickly and cheaply?

I need to sign a PDF document. However, Adobe Reader does not let me sign documents. I just need to sign the document, not edit it. Do I need to buy the full Acrobat software? Or is there a better, ...
17 votes
2 answers
5k views

What happens if a signature of a program expires?

Can the program still be installed after the expiration date of the signature? Or does it have to be signed again?
1 vote
0 answers
553 views

Openssl DSA Signature Verification Failure Error not understood

I am given a public key in PEM format: -----BEGIN PUBLIC KEY----- MIIDRjCCAjkGByqGSM44BAEwggIsAoIBAQCPPVSofEh+2wGLK/1UOEbx7R5YgCp5 JVrhglBS2QZxdiYnl9JCHVuFQC/vOxFeNmP9GUxv1vcQ7Jjr0J26sdUDFg+dP3ZD ...
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2 votes
1 answer
166 views

Provide download repository with signed DEB-packages?

I provide an own download repository for Ubuntu DEB-packages. It comes with a directory structure in style https://mydomain.tld/download/Ubuntu/dists/bionic/main/binary-amd64/ The directory contains ...
1 vote
0 answers
58 views

Disable Digital Signature Certification or issue a blanket certificate for all users on an InfoPath form?

We have some Time-Off request forms that are sent through InfoPath 2007 via e-mail and it goes down the verification line (e.g. Employee signs and it gets sent to their supervisor then it gets sent to ...
1 vote
1 answer
13k views

Trying to verify a download signature with PGP, but getting "no signed data" when passing in the .asc file?

I tried the following steps from Verifying Signatures on the Tor Project: gpg.exe --keyserver pool.sks-keyservers.net --recv-keys 0x4E2C6E8793298290 imported: 1 gpg.exe --fingerprint ...
0 votes
1 answer
1k views

Outlook Signature By Time

Good Afternoon, I currently have a client who is experiencing some issues with his signatures in Outlook. As part of his business he has a disclaimer attached to the bottom of his signature to ...
0 votes
1 answer
613 views

Can't sign with DSA

A DSA key is created with: openssl genpkey -genparam -algorithm DSA -out dsaparams.pem -pkeyopt dsa_paramgen_bits:1024 openssl genpkey -paramfile dsaparams.pem -out dsakey.pem When I try to sign, ...
0 votes
2 answers
2k views

Add author at SFX archive with WinRAR

For example: In "Autore" i want insert an author.
0 votes
0 answers
73 views

Why (and how) to verify the signature of a download? [duplicate]

I have downloaded rsync from the official page. Each rsync download is associated with a signature. First, why should I check the signature? What am I risking if not doing that? I assume that if ...
0 votes
2 answers
381 views

Outlook 2013 - set different signatures for different domain mailboxes

I have a domain exchange account on Outlook, and my exchange account includes several mailboxes. If I go to the Account settings, only the primary email account shows, and it doesn't display the ...
0 votes
1 answer
3k views

TAP 9.21.2 Driver - An error occurred installing the tap device

I have Windows 8.1 64-bit and I tried to install Betternet, but it gave me an error when trying to install the TAP driver, so I tried to install the TAP driver by itself and it gave me the same error. ...
0 votes
1 answer
1k views

Outlook signatures location suddenly changed [duplicate]

I have an installation of Outlook 2010 that used to look for signature files in %appdata%\Microsoft\Signatures. However, recently it created a folder in Application Data\Microsoft\Signatures in the ...
-1 votes
2 answers
2k views

When trying to create an MSI getting error has no digital signature, or has a digital signature that is not verified

When we are trying to generate an MSI using a tool supplied by HP ALM, we get the following error This is happening only on one machine but works fine on other machine so we think something is wrong ...
1 vote
1 answer
3k views

About the security of adding a signature to a PDF file

We can add a "bitmap" or image signature to a PDF file, either by using Adobe Acrobat or by Mac's Preview app, but I wonder, besides always encrypting it with a password before sending it by email to ...