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[ FIRST WE WILL ENCRYPT OUR TEXT TO AES-256-CBC ]

openssl enc -e -aes-256-cbc -iv sof0 -K sos -base64 <<< "lol man"

[ IN JPEG FILE ]

• SOF0 = (START OF FRAME) KEY = 16 BIT

• SOS = (START OF SCAN) KEY = 32 BIT IN AES-256

[ IN AES-192 THE SOS IS 24 BIT ]

[ IN AES-128 THE SOS IS 16 BIT ]

[ LET'S FIND SOF0 AND THE 16 BIT KEY IN JPEG ]

hexedit --color a.jpeg

• CTL + S

[ SEARCH FFC00011 ]

• SOF0 HEX CODE IS = FF C0 00 11

RESULT IS ->

16.jpg

16.jpg

[ NOW WE FIND SOS AND ITS 32 BIT KEY ]

[ SEARCH FFDA ]

SOS HEX CODE IS = FF DA

RESULT IS ->

32.jpg

32.jpg

[ NOW ITS TIME TO DECRYPT OUR MESSAGE ]

openssl enc -d -aes-256-cbc -iv 08014600dc0211212322334 -K 430950934093440398 -base64 >>> "enc message"

[ IF YOU WANT MORE SECURE YOUR ENC MESSAGE ]

cat > mess

output -> lol man

openssl enc -e -aes-256-cbc -iv sof0 -K sos -in mess > mess.enc

[ COPY THE ENC MESSAGE ]

echo "enc msg" | base64

[ NOW PASTE THIS ENC MSG TO JPEG ]

[ DECRYPT ]

echo "enc msg" | base64 -d > mess.enc

openssl enc -d -aes-256-cbc -iv sof0 -K sos -in mess.enc