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seen Jan 22 at 19:24

Nov
21
comment How to break AES/CBC/PKCS5 when key and IV are reused?
Ahh, I think I missed the distinction between stream and block ciphers in that article.
Nov
21
comment How to break AES/CBC/PKCS5 when key and IV are reused?
Richie - can you elaborate on the chosen plaintext attack? Because that's exactly what I'm trying to do.
Nov
21
comment How to break AES/CBC/PKCS5 when key and IV are reused?
Thank you for this detailed comment. I tried to work through the Wikipedia article on IV to work out a known-plaintext attack. I really thought that was the path forward to breaking this. Is that an attack that works for other ciphers, but not AES?
Nov
21
awarded  Student
Nov
21
comment How to break AES/CBC/PKCS5 when key and IV are reused?
When I first saw the data, I thought they were in ECB mode because I saw several rows of identical ciphertext. That's how I figured out they were reusing the same IV (and key) every time.
Nov
21
comment How to break AES/CBC/PKCS5 when key and IV are reused?
The code supports larger plaintext sizes, so maybe that's the reason for PKCS7.
Nov
21
asked How to break AES/CBC/PKCS5 when key and IV are reused?