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Cryptography

Ciphers, hashes, keys and certificates.

All 4 Documents 3 Courses 1
All levels Beginner Advanced Expert

Beginner

Start here. No background needed beyond school maths.

Document Beginner ↗ External site

Crypto 101

A free introductory book on cryptography for programmers: ciphers, hashes, keys and the usual mistakes.

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Course Beginner ↗ External site

Cryptography

Gentle videos and exercises from ancient ciphers to modern public-key cryptography.

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Document Beginner ↗ External site

How Let's Encrypt Works

A short explanation of certificates and how HTTPS gets issued.

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Advanced

Once the basics are comfortable.

Document Advanced ↗ External site

The Cryptopals Crypto Challenges

Programming exercises that teach you to attack broken cryptography so you learn how not to build it.

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More in Cybersecurity

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