diff --git a/2020/25/25.py b/2020/25/25.py
new file mode 100644
index 0000000..5691174
--- /dev/null
+++ b/2020/25/25.py
@@ -0,0 +1,22 @@
+pubkey1 = 3418282
+pubkey2 = 8719412
+
+subject = 7
+mod = 20201227
+
+loop1 = 0
+value1 = 1
+while value1 != pubkey1:
+	value1 = (value1 * subject) % mod
+	loop1 += 1
+
+loop2 = 0
+value2 = 1
+while value2 != pubkey2:
+	value2 = (value2 * subject) % mod
+	loop2 += 1
+
+enckey1 = pow(pubkey2,loop1,mod)
+enckey2 = pow(pubkey1,loop2,mod)
+assert enckey1 == enckey2
+print(enckey1)
\ No newline at end of file
diff --git a/2020/25/input.txt b/2020/25/input.txt
new file mode 100644
index 0000000..48809f6
--- /dev/null
+++ b/2020/25/input.txt
@@ -0,0 +1,2 @@
+3418282
+8719412
\ No newline at end of file