Paragon Initiative Enterprises Blog

The latest information from the team that develops cryptographically secure PHP software.

Protecting RSA-based Protocols Against Adaptive Chosen-Ciphertext Attacks

A deep dive into preventing chosen-ciphertext (e.g. padding oracle) attacks against RSA in custom encrypted transport protocols.


The 2018 Guide to Building Secure PHP Software

Everything a developer needs to know to build secure software in the PHP programming language in the year 2018


Assuring Ciphertext Integrity for Homomorphic Cryptosystems

How to build a homomorphic encryption scheme that is not vulnerable to chosen-ciphertext attacks, using blockchain-like protocols.


The Quick Guide to Simple and Secure Automatic Updates

How to build your own automatic update system that is verifiably secure.


Libsodium Quick Reference: Similarly-Named Functions and Their Use-Cases

A quick comparison of libsodium functions with similar names/purposes, and which one to use for a specific use case


Building Searchable Encrypted Databases with PHP and SQL

How to implement field-level data encryption while still allowing fast queries.


Checklist-Driven Security Considered Harmful

Application security has a checklist problem; we propose a better way forward.


No Way, JOSE! Javascript Object Signing and Encryption is a Bad Standard That Everyone Should Avoid

JWT, JWE, JWS, etc. are terrible designs and need to be scrapped, not resuscitated.


Split Tokens: Token-Based Authentication Protocols without Side-Channels

A Brief Introduction to our Split Token Approach


Cryptographically Secure PHP Development

Your field guide to building secure cryptography features in PHP


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Our Security Newsletters

Want the latest from Paragon Initiative Enterprises delivered straight to your inbox? We have two newsletters to choose from.

The first mails quarterly and often showcases our behind-the-scenes projects.

The other is unscheduled and gives you a direct feed into the findings of our open source security research initiatives.

Quarterly Newsletter   Security Announcements