Cryptography

How to fix tpm2_ptool: Failed to open specified TCTI device file /dev/tpmrm0: Permission denied

Categories: Cryptography

Uli Köhler

2024-06-21 2 min read

How to MD5-hash file in C++ using OpenSSL

Categories: C/C++, Cryptography

Uli Köhler

2023-06-09 0 min read

How to compute SHA256 of std::string (hex or binary) using OpenSSL

Categories: C/C++, Cryptography

Uli Köhler

2023-06-08 1 min read

How to export GPG public key to file using the command line

Categories: Cryptography

Uli Köhler

2022-05-16 0 min read

How to fix OpenVPN 'failed to find GID for group openvpn'

Categories: Cryptography, Linux

Uli Köhler

2019-04-02 0 min read

How to fix OpenVPN 'failed to find UID for user openvpn'

Categories: Cryptography, Linux

Uli Köhler

2019-04-02 0 min read

How to generate Diffie-Hellman (DH) parameters using OpenSSL

Categories: Cryptography, Linux

Uli Köhler

2019-04-02 1 min read

GPG symmetric encryption: Passphrase on command line

Categories: Cryptography

Uli Köhler

2018-12-18 0 min read

How to automatically renew Let's Encrypt certbot certs on Ubuntu

Categories: Cryptography, Linux

Uli Köhler

2018-12-16 1 min read

How to build libsodium (NaCl) DEB packages

Categories: Cryptography, Linux

Uli Köhler

2013-08-01 0 min read