Wireshark - exports what it recognises as a jpeg but the jpeg doesn't open

Question

I have a JPEG GET request in my PCAP as below but when I export it, it's not a valid JPEG file

Any advice as to what I'm doing wrong?

Answer 1

The contents you see are encoded in Base64, where each character you see represents 6 bits of data, not 8 bits.

You need to decode that Base64 data into binary data, but what you on the screen is not an exact data, as all the unprintable characters were displayed as dots.

You need to get the binary data of the packet, then pass it through a Base64 decoder.