code signing

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code signing

A method of ensuring that an executable program has come from a valid software publisher and has not been altered by anyone in between. An EXE, CAB, driver or other executable file is digitally signed and transmitted along with a digital certificate from a certification authority (CA) such as VeriSign, Thawte or Go Daddy.

Verifying the Signed Certificate
After the code-signed executable is downloaded from a website, its certificate is extracted by the user's browser. From an internal list of CAs and their public keys, the browser uses the public key to verify the certificate's signature.

Verifying the Signed Executable
Next, the publisher's public key is used to verify the signature created from the executable's binary content. The public key decrypts the signature back into the digest, which is compared to the newly computed digest at the client side. If they match, the executable has not been tampered with. For more details, see digital certificate and digital signature.

Object and Code Signing
The terms object signing and code signing are used interchangeably; however, object signing refers to any file delivered in this manner. Code signing refers only to executables, which is the major concern when downloading from the Internet. See PKCS.


The Short Version
The executable is signed with the software publisher's private key. When opened for use, its signature is verified. The details of the process are diagrammed below.







The Code Signing Process
The combination of the signed digital certificate and the signed executable file ensures that the executable has come from a valid publisher and has not been tampered with.


The Code Signing Process
The combination of the signed digital certificate and the signed executable file ensures that the executable has come from a valid publisher and has not been tampered with.
References in periodicals archive ?
The issue appears to be related to a code signing certificate built into the browser that expired today, leading to the sudden failure of extensions.
"When downloading AV Voice Changer Software Diamond, only our official website and our verified partners are able to protect users by offering the most reliable authenticity and integrity; for it is only from those sites that users can find the code signing certificate from DigiCert.
At the beginning of 2016 Microsoft changed the way in which Windows enforces Authenticode code signing, meaning that it will not trust any code signed with a SHA-1 code signing certificate timestamped after January 1, 2016.
The security firm also added that such act is possible because iOS does not verify that the code signing certificate is the same for apps that use the same bundle identifier, (http://appleinsider.com/articles/14/11/10/masque-attack-for-ios-could-let-hackers-replace-legitimate-apps-with-malicious-copies) Apple Insider reports.
(Nasdaq: SYMC) has announced it has completed its acquisition of VeriSignEoACAOs (Nasdaq: VRSN) identity and authentication business, which includes the Secure Sockets Layer (SSL) and Code Signing Certificate Services, the Managed Public Key Infrastructure (MPKI) Services, the VeriSign Trust Seal, the VeriSign Identity Protection (VIP) Authentication Service and the VIP Fraud Detection Service (FDS).
California City, CA, August 19, 2017 --(PR.com)-- Audio4fun, one of the leading companies in multimedia processing tools for over 17 years, announced today that its best-selling product, Voice Changer Software Diamond, has a new code signing certificate issued by DigiCert.
They have diversified SSL products ranging from domain validation, business validation, extended validation and code signing certificate. The motto of company is to join Google's movement to make the internet safer place by providing highest encryption to small, medium, or large enterprises.
HostDomainZone.com provides complete web services like domain name registration, web hosting, servers, email, fax thru email, calendar, photo ablum, SSL certificates, code signing certificate, shopping cart, custom web site design, custom logo design, online marketing and other internet presence products that enable individuals and businesses to establish and maintain their online presence.
Suckfly tried stealing code signing certificates from the companies.
Certs 4 Less will give away Pre-Paid Visa Gift Cards to eligible customers that order SSL Certificates or Code Signing Certificates this month.