Cross-platform PDF digital signing tool. JavaFX desktop UI with drag-to-place visible signatures, PKCS#11/PKCS#12 keystores, RFC 3161 timestamping, OCSP/CRL long-term validation, and a scriptable CLI.

Digital signing tool for legal contracts

Digital signing tool for legal contracts

I'm recycling my old broken tablet as a digital sign

go globalsign client SDK

A Python tool for security research, exploring SSL certificate generation and executable signing to study antivirus evasion techniques in a controlled, ethical environment.

crauns is a tool to prove that the person is a member of the same group by scanning thumbnail icon. It uses RSA private key and public key to sign.

Java backend simulating a blockchain-based crypto trading platform with smart contracts, digital signing, and real-time market data. This challenge deepened my understanding of blockchain mechanics, RSA encryption, and rule-based transaction validation.