diff --git a/doc/papers/hash_signatures_2Mss.pdf b/doc/papers/hash_signatures_2Mss.pdf
new file mode 100644
index 0000000..0f04e1a
Binary files /dev/null and b/doc/papers/hash_signatures_2Mss.pdf differ
diff --git a/doc/papers/merkle1.pdf b/doc/papers/merkle1.pdf
new file mode 100644
index 0000000..7acb87b
Binary files /dev/null and b/doc/papers/merkle1.pdf differ