These are the slides used for presenting the OpenSSL - User Manual and Data Format by Vittorio Giovara.

1. OpenSSL
User Manual and Data Format
1

2. Main Functions
• Benchmark
• Certificates
• Digital Signature
• Encryption/Decryption
• Private and Public Keys
• a lot of other stuff...
2

3. OpenSSL
Symmetric Encryption
3

4. openssl enc
• cipher
• salt
• key
• initial vector
• password
• ...
4

5. password?
5

6. EVP_BytesToKey
arguments results
• type of cipher • key
(des3, aes & others)
• initial vector
• salt • key length
• data and data length
• iteration counter
• hash
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7. openssl enc -des3 -in file.txt -out file.enc
-salt -k mySillyPassword -md md5
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8. D= 0 ... ... ...
means “concatenation”
HASH 2 (data)= HASH(HASH(data))
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9. key & iv
0 A4 0C 80 14 75 41 21 90
key iv
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10. salt
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11. salt
without salt your dishes
will always taste the same!
the same applies to keys
and initial vectors!
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12. Demo
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