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encoding, encryption

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Anthony Fadly 1 년 전
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      november/nov19.md

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@@ -13,9 +13,6 @@
- CERTS
- SSH-SSL-TLS

- Encoding - everyone knows how to convert between these types of data
- Encryption - only a select group of people have the key to convert this data

```
$ nc smtp.example.com 25 # this connection is plaintext
HELO server
@@ -49,3 +46,11 @@ AUTH LOGIN
- who said it (authentication)
- ask the source (repudiation)
- no [man-in-the-middle](https://en.wikipedia.org/wiki/Man-in-the-middle_attack) (integrity)

## Encrypting and Encoding

- Encoding - everyone knows how to convert between these types of data
- Encryption - only a select group of people have the key to convert this data

encryption(plaintext, key) = ciphertext
decryption(ciphertext, key) = plaintext

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