diff --git a/.gitignore b/.gitignore
index 453c4cf..aee392c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 *.mpv
 *.mkv
 *.mp4
+*.jpg
\ No newline at end of file
diff --git a/6/krzywa.rb b/6/krzywa.rb
index c663537..22c10c1 100755
--- a/6/krzywa.rb
+++ b/6/krzywa.rb
@@ -83,7 +83,7 @@ end
 
 def sumaPunktow(a,b,p,x1,y1,x2,y2)
   # P + Q = R
-  if (x1 != x2) && (y1 != y2)
+  if (x1 != x2)
     lambda = (((y2 - y1) % p) * reciprocal_Phi_p((x2 - x1),p)) % p
     x3 = (betterExponentiation(lambda,2,p) - (x1 % p) - (x2 % p)) % p
     y3 = (lambda * (x1 - x3) - y1) % p
diff --git a/8-lab/lab4_kryptoalgo.pdf b/8-lab/lab4_kryptoalgo.pdf
new file mode 100644
index 0000000..aff4c9d
Binary files /dev/null and b/8-lab/lab4_kryptoalgo.pdf differ
diff --git a/7-cw/szyfrowanie-krzywe.rb b/8-lab/szyfrowanie-krzywe.rb
similarity index 100%
rename from 7-cw/szyfrowanie-krzywe.rb
rename to 8-lab/szyfrowanie-krzywe.rb
diff --git a/module2.rb b/module2.rb
new file mode 120000
index 0000000..f304fa7
--- /dev/null
+++ b/module2.rb
@@ -0,0 +1 @@
+6/krzywa.rb
\ No newline at end of file