Mastering Cryptography Fundamentals with Node’s crypto module

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Orqixfkee Rkmrkmvkoryw Unbfrktghccq lbhj Emsx’g eiwemc ofbjes

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Mastering Cryptography Fundamentals with Node’s crypto module

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Cryptography (the study of the techniques of secret writing)

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Yonatan Mevorach @cowchimp blog.yonatan.dev

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Cryptography Fundamentals Encryption

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Alice Eve Bob

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plaintext ciphertext

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JSConf JP PfbtMZX

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PfbtMZX

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PfbtMZX JSConf JP

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AES Advanced Encryption Standard

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aes-256-cbc

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CBC Cipher Block Chaining

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IV Initialization Vector

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IV plaintext ciphertext

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b905af Hello 0402a10291

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e6c24c Hello c2cfc0a26

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f23bbf Hello 7fa587061

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iv ciphertext algorithm

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f23bbf 7fa587061 Hello

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h0pper 🔑 h0pper

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Cryptography Fundamentals Key Derivation Functions

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h0pper 🔑 Sp9IxQEzyzdZ94B4VyQoF+6e3EKgJPdoQDF99Ta

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Password Key password XohImNooBHFR0OVvjcYpJ3NgPQ1qq73WKhHvch0VQtg= 123456 jZae727K08KaOmKSgOaGzww/XVqGr/PKEgIMkjrcbJI= qwerty ZehL4zUy+3hMSBKWdfnv86aCsnFowOp0Syz1juAjN8U= 111111 vLFfghR5tNV3K9DKhmwArV+SbjWAcgZZzIDTnJ0JgCo= ppppp dylyfv5OoHljyL+JdqS6YiURDJgRwo+Rgdb/gRTptps= 1q2w3e4r cquZT6LrQmwFHvWcrWF3UL/gbXz2MRKF/3nBnDKv0jY= 123123123 ky88G1YlfOhTmsJp16q0JVDaz4gY0HXwvfGZBWKq4+8= aueuaueu mzVJAUV6pKrLwUQ/+U+vcBAfkP4Vv9iSFzAWI7+eW60=

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h0pper 🔑 🧂 oFzBqXkAn5TxjIvhWi dPuYLRSLIr9w23egqkqAQP+z5rFz1DDYy8jcXTo

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Notable mentions 🧐 ● crypto.hkdf ( HMAC-based Key Derivation Function) ● crypto.pbkdf2 (Password-Based Key Derivation Function 2)

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Cryptography Fundamentals Randomness

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Cryptography Fundamentals Key Distribution Problem

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RONALD L. RIVEST: PHOTOS

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bob’s private key bob’s public key

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bob’s public key

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bob’s public key plaintext ciphertext

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ciphertext

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bob’s public key plaintext ciphertext bob’s private key bob’s public key ciphertext plaintext

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Notable mentions 🧐 ● crypto.createDiffieHellman (Diﬃe-Hellman key exchange) ● crypto.createECDH (Elliptic Curve Diﬃe-Hellman)

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Cryptography Fundamentals Signing and Verifying

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alice’s private key alice’s public key message signature

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alice’s public key message signature

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alice’s private key message alice’s public key signature alice’s public key message signature

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Notable mentions 🧐 ● crypto.createHmac (Hash-Based Message Authentication Code)

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Cryptography Fundamentals Public Key Certificates

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Alice Carol Bob

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alice’s private key alice’s public key metadata TBS carol’s private key signature alice’s certificate carol’s public key

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carol’s private key carol’s public key alice’s certificate signature metadata alice’s public key

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Alice Carol Bob

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Alice Carol Doris Bob

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Cryptography Fundamentals ● Encryption ● Key Derivation Functions ● Randomness ● Key Distribution Problem \ Asymmetric Encryption ● Signing and Verifying ● Public Key Certificates