# 07_密碼學與密碼分析
## 電影欣賞
模仿遊戲
https://www.youtube.com/watch?v=d2ISw6427aw

國家寶藏2


Playfair online tool
https://www.boxentriq.com/code-breaking/playfair-cipher

## 範例程式
RSA python code
https://cryptobook.nakov.com/asymmetric-key-ciphers/rsa-encrypt-decrypt-examples

`$ time python3 rsa.py`

AES python code
https://cryptobook.nakov.com/symmetric-key-ciphers/aes-encrypt-decrypt-examples

`$ time python3 aes.py`
回合鑰匙加法運算：AddRoundKey() 將加密區塊與回合金鑰進行加法運算
位元組取代運算：SubBytes() 進行類似 DES 中 S-Box 的置換運算
列移位運算：ShiftRows() 對加密區塊作平移與旋轉處理
混合行運算：MixColumns() 加密區塊與一矩陣進行一乘法運算

SSL/TLS tool
`$ git clone https://github.com/drwetter/testssl.sh.git`
`./testssl.sh <URI>`
POODLE
SWEET32
BEAST
LUCKY13
FREAK
LOGJAM

OpenSSL generate RSA keypair
https://rietta.com/blog/openssl-generating-rsa-key-from-command/
`openssl genrsa -des3 -out private.pem 2048`
`openssl rsa -pubout -in private.pem -out public.pem`
Factor DB
http://factordb.com/index.php
5840359807
39505874583265144526419767800614481996020776460304936454139376051579355626529450683609 727842468219535093544305870490251995655335710209799226484977949442955603

Caesar Cipher Decoder
https://www.boxentriq.com/code-breaking/caesar-cipher

Data Hidding
`apt-get install steghide`
`steghide embed -cf picture.jpg -ef secret.txt`
`steghide extract -sf picture.jpg`
`steghide info received_file.wav`

QR code Generator
https://www.qr-code-generator.com

Windows PGP
https://www.gpg4win.org/

List all Cipher Suites
`openssl ciphers`