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Criptografia para Leigos
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Dann Luciano
September 17, 2016
Programming
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Criptografia para Leigos
Palestra apresentada no Software Freedom Day 2016 em Teresina-PI-BR
Dann Luciano
September 17, 2016
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Transcript
Criptografia Para Leigos por Dann Luciano 1
2
25 Gigabytes de Dados 30 Milhões de Contas Ashley Madison
https://www.theguardian.com/ 3
4
68 Milhões de Senhas Dropbox https://www.theguardian.com/ 5
Dann Luciano 6
7
Criptografia O que é? 8
9 “Au!g64dhsUI#4&(*a” “Software Freedom Day 2016”
❤ 10 “Software Freedom Day 2016”
Objetivos 11
I. Confidencialidade 12
II. Integridade 13
III. Autenticação 14
Conceitos 15
Texto Claro (P) “Software Freedom Day 2016” 16
Texto Cifrado (C) 17
Criptografar (E) “Software Freedom Day 2016” ⊗ 18
Descriptografar (D) ⊗ “Software Freedom Day 2016” 19
Chave (K) ❤ 20
E(P, K) = C D(C, K) = P
Fundamentos da Criptografia 22
XOR Ou Exclusivo 23
XOR P K XOR(P, K) = C XOR(C, K) =
P 0 0 0 0 0 1 1 0 1 0 1 1 1 1 0 1
XOR A xor B = B xor A A xor
A = 0 A xor 0 = A
XOR
Hash MD5, SHA1, SHA256
Hash • Propriedades Impossíveis/Difíceis: 1. Modificar uma Mensagem sem mudar
o Hash 2. Gerar uma Mensagem a partir de um Hash 3. Encontrar duas Mensagens com o mesmo Hash
Hash != Criptografia
Rainbow Tables
Senha MD5 password 5f4dcc3b5aa765d61d8327deb882cf99 p4ssw0rd 2a9d119df47ff993b662a8ef36f9ea20 12345678 25d55ad283aa400af464c76d713c07ad … …
NÃO Use MD5/SHA1 para Senhas
Criptografia Hash
Geradores de Números Aleatórios 34
Geradores de Números Aleatórios • Geradores de Números Aleatórios •
Geradores de Números Pseudo-Aleatórios Seguros • Geradores de Números Pseudo-Aleatórios
Finalizando
Criptografia é Difícil
Criptografia é Compreensível
Dicas
Use HTTPS 40
https://www.eff.org/https-everywhere
Use FERNET Nos Dados
https://github.com/fernet/spec/
Use Scrypt/Bcrypt Nas Senhas
https://www.tarsnap.com/scrypt.html
Próximos Passos 46
https://codemoji.org/ 47
http://cartilha.cert.br/criptografia/ 48
https://crypto101.io/ 49
Muito Obrigado! 50 ? https://speakerdeck.com/dannluciano
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