diff --git a/content/notes/05-crypography.md b/content/notes/05-crypography.md
index d5c8edc38..64de4ca54 100644
--- a/content/notes/05-crypography.md
+++ b/content/notes/05-crypography.md
@@ -27,6 +27,11 @@ We all have legit needs for privacy. Cryptography provides technical measure for
 - caesar cipher
 	- simple substitution scheme (rotation)
 	- vulnerable to cryptanalysis
+	- key is a single integer
+	- symmetrical (same key for encrypt and decrypt)
+	- so ciphertext has the same patterns as the plaintext e.g., letter frequencies
+	- this leads to cryptanalysis: systematic ways of determining the encryption scheme
+	- modern ciphers aim to make the cipher text resemble *noise* (random data)
 
 # General process
 - encrypt
@@ -45,4 +50,5 @@ mathmatically
 # Plaintext
 refers to unencypted message. In the digital age the messages are often not plain text (ascii, unicode, etc).
 
-digital crypto schemes normally work on the binary data (images, .docs, .txt, mp4 etc.)
\ No newline at end of file
+digital crypto schemes normally work on the binary data (images, .docs, .txt, mp4 etc.)
+