diff --git a/cipher/instructions.md b/cipher/instructions.md
index b61a07f..c25b502 100644
--- a/cipher/instructions.md
+++ b/cipher/instructions.md
@@ -1,6 +1,41 @@
-## HOW TO DECRYPT — STEP BY STEP (using your 8-bit machine)
+### HOW TO DECRYPT — STEP BY STEP (by hand)
 
-1. Type in the NERDLETTER DECRYPTOR BASIC program (see below)
+1. **Key Generation**
+   - You generate a **truly random key** that is **exactly as long as the plaintext message**.
+   - The key must be purely random (each bit or character has equal probability and no patterns).
+   - The key is shared securely between sender and receiver **in advance** (this is the hard part in practice).
+
+2. **Encryption**
+   - Take the plaintext message.
+   - Combine it with the key using a reversible operation. The two most common methods are:
+     - **Bitwise XOR** (for binary data — the standard modern way)
+     - **Modular addition** (for letters, e.g., A=0, B=1, ..., Z=25 — the classic "pad" method)
+
+   **Example with letters (Vigenère-style addition mod 26):**
+
+   Plaintext:  `H E L L O`  
+   → Numbers: `7 4 11 11 14`
+
+   One-time pad: `X M C K L`  
+   → Numbers: `23 12 2 10 11`
+
+   Ciphertext: `(7+23) (4+12) (11+2) (11+10) (14+11) mod 26`  
+   → `4 16 13 21 25`  
+   → Letters: `E Q N V Z`
+
+3. **Decryption**
+   - The receiver does the **inverse operation** with the same key.
+   - For modular addition: subtract the key (mod 26).
+   - For XOR: XOR the ciphertext with the key again (XOR is its own inverse).
+
+   Ciphertext: `E Q N V Z`  
+   Key:        `X M C K L`  
+   Plaintext:  `H E L L O`
+
+
+### HOW TO DECRYPT — STEP BY STEP (using your 8-bit machine)
+
+1. Type in the NERDLETTER DECRYPTOR BASIC program (provided with your subscription)
 2. RUN
 3. When it asks, type the PAD groups from the appropriate page:
 
@@ -12,7 +47,7 @@
 
 5. The machine will instantly print the plaintext!
 
-## RESULT YOU SHOULD SEE:
+#### RESULT YOU SHOULD SEE:
 
 ```
 MARYHADALITTLELAMB
diff --git a/cipher/padgen.py b/cipher/padgen.py
new file mode 100644
index 0000000..34011a9
--- /dev/null
+++ b/cipher/padgen.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+"""Generate a one-time pad of uppercase letters from /dev/urandom."""
+import sys
+
+def generate_daybook(weeks: int = 52):
+    for week in range(1, weeks + 1):
+        with open(f"daybook_week_{week:02d}.txt", "w") as f:
+            f.write(f"WEEK {week:02d}\n\n")
+            f.write(format_pad(generate_pad(500)))
+
+def generate_pad(num_letters: int) -> str:
+    """Read raw bytes from /dev/urandom and map them uniformly to A-Z."""
+    letters = []
+    with open("/dev/urandom", "rb") as f:
+        while len(letters) < num_letters:
+            b = f.read(1)[0]
+            # Reject bytes >= 234 to avoid modulo bias.
+            # 234 = 9 * 26, so bytes 0..233 map uniformly to 0..25.
+            if b < 234:
+                letters.append(chr((b % 26) + 65))
+    return "".join(letters)
+
+
+def format_pad(text: str, group_size: int = 5, groups_per_line: int = 10) -> str:
+    """Format as 5-letter groups, 10 groups per line — classic OTP layout."""
+    groups = [text[i:i + group_size] for i in range(0, len(text), group_size)]
+    lines = [" ".join(groups[i:i + groups_per_line])
+             for i in range(0, len(groups), groups_per_line)]
+    return "\n".join(lines)
+
+
+if __name__ == "__main__":
+    n = int(sys.argv[1]) if len(sys.argv) > 1 else 500
+    print(format_pad(generate_pad(n)))
\ No newline at end of file
diff --git a/cipher/scripts/nerdletter_numbers_station.sh b/cipher/scripts/nerdletter_numbers_station.sh
index 778065b..020c449 100755
--- a/cipher/scripts/nerdletter_numbers_station.sh
+++ b/cipher/scripts/nerdletter_numbers_station.sh
@@ -119,4 +119,6 @@ drawtext=font='Courier':fontsize=44:fontcolor=lime@0.95:text='${MESSAGE}':x=(w-t
 drawtext=font='Courier':fontsize=30:fontcolor=green@0.75:text='DESTROY PAGE AFTER USE — SUBSCRIBERS ONLY':x=(w-text_w)/2:y=640" \
   -c:v libx264 -pix_fmt yuv420p -c:a aac -shortest "$OUTFILE" -y
 
+rm "${TMPDIR}/final_audio.wav"
+
 echo "Done: ${OUTFILE}"
diff --git a/site/index.html b/site/index.html
index 5cac401..c77e178 100644
--- a/site/index.html
+++ b/site/index.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>The Nerdletter • Retro-Modern Fusion</title>
+  <title>The Nerdletter • Retro-Modern Fusion Newsletter</title>
   <style>
     @import url('https://fonts.googleapis.com/css2?family=VT323&display=swap'); /* Perfect CRT font */
     body {