Encryption
Rietta's encryption posts cover OpenSSL key generation, password hashing, OpenPGP, TLS certificate lifetimes, and encryption policy fights.
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06/13/2013
OpenSSL: Encrypt Data with an RSA Key with PHP
by Frank Rietta
An example PHP function that encrypts arbitrary data, including strings and arrays, with an RSA public key generated with OpenSSL from the command line.
04/05/2012
What is Protected Personally Identifiable Information? Do I really have to hash users' passwords?
by Frank Rietta
01/27/2012
Generate OpenSSL RSA Key Pair from the Command Line
by Frank Rietta
How to generate a 2048-bit RSA key pair with OpenSSL from the command line. Updated for 2026 to match current OpenSSL output and ciphers.
Read More: Generate OpenSSL RSA Key Pair from the Command Line
01/09/2012
OpenSSL: Encrypt a File with a Password from the Command Line
by Frank Rietta
Read More: OpenSSL: Encrypt a File with a Password from the Command Line
08/17/2009
Authentication Without Encryption for Ham Radio
by Frank Rietta
Crypto can be used for secure authentication without obscuring the meaning of communications - by KI4AWF.