diff --git a/unit01_cipher_fundamentals/lecture/~$chapter01_ciphers_fundamentals.pptx b/unit01_cipher_fundamentals/lecture/~$chapter01_ciphers_fundamentals.pptx deleted file mode 100644 index b71c76f..0000000 Binary files a/unit01_cipher_fundamentals/lecture/~$chapter01_ciphers_fundamentals.pptx and /dev/null differ