diff --git a/school/intro-crypto/uebung/03/u03/.gitignore b/school/intro-crypto/uebung/03/u03/.gitignore
new file mode 100644
index 0000000..53eaa21
--- /dev/null
+++ b/school/intro-crypto/uebung/03/u03/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/school/intro-crypto/uebung/03/u03/target/.rustc_info.json b/school/intro-crypto/uebung/03/u03/target/.rustc_info.json
deleted file mode 100644
index f5035cb..0000000
--- a/school/intro-crypto/uebung/03/u03/target/.rustc_info.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc_fingerprint":12819272735836075344,"outputs":{"1617349019360157463":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/me/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\nunix\n",""],"15337506775154344876":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/me/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\nunix\n",""],"1164083562126845933":["rustc 1.29.2 (17a9dc751 2018-10-05)\nbinary: rustc\ncommit-hash: 17a9dc7513b9fea883dc9505f09f97c63d1d601b\ncommit-date: 2018-10-05\nhost: x86_64-unknown-linux-gnu\nrelease: 1.29.2\nLLVM version: 7.0\n",""]}}
\ No newline at end of file
diff --git a/school/intro-crypto/uebung/03/u03/target/debug/.cargo-lock b/school/intro-crypto/uebung/03/u03/target/debug/.cargo-lock
deleted file mode 100644
index e69de29..0000000
diff --git a/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-4d5f92818f15e465/bin-u03-4d5f92818f15e465 b/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-4d5f92818f15e465/bin-u03-4d5f92818f15e465
deleted file mode 100644
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--- a/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-4d5f92818f15e465/bin-u03-4d5f92818f15e465
+++ /dev/null
@@ -1 +0,0 @@
-c9aea05b4f7bab6b
\ No newline at end of file
diff --git a/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-4d5f92818f15e465/bin-u03-4d5f92818f15e465.json b/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-4d5f92818f15e465/bin-u03-4d5f92818f15e465.json
deleted file mode 100644
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+++ /dev/null
@@ -1 +0,0 @@
-{"rustc":2049182171942789226,"features":"[]","target":8092603168892422263,"profile":7338771462028609488,"path":1036222786711178230,"deps":[],"local":[{"MtimeBased":[[1541015098,863087767],".fingerprint/u03-4d5f92818f15e465/dep-bin-u03-4d5f92818f15e465"]}],"rustflags":[],"edition":"Edition2015"}
\ No newline at end of file
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diff --git a/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-560dcfd44619ed7e/bin-u03-560dcfd44619ed7e b/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-560dcfd44619ed7e/bin-u03-560dcfd44619ed7e
deleted file mode 100644
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--- a/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-560dcfd44619ed7e/bin-u03-560dcfd44619ed7e
+++ /dev/null
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\ No newline at end of file
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deleted file mode 100644
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--- a/school/intro-crypto/uebung/03/u03/target/debug/.fingerprint/u03-560dcfd44619ed7e/bin-u03-560dcfd44619ed7e.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc":2049182171942789226,"features":"[]","target":8092603168892422263,"profile":8925656243208791261,"path":1036222786711178230,"deps":[],"local":[{"MtimeBased":[[1541015093,869731229],".fingerprint/u03-560dcfd44619ed7e/dep-bin-u03-560dcfd44619ed7e"]}],"rustflags":[],"edition":"Edition2015"}
\ No newline at end of file
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diff --git a/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-4d5f92818f15e465 b/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-4d5f92818f15e465
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deleted file mode 100644
index 312bf06..0000000
--- a/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-4d5f92818f15e465.d
+++ /dev/null
@@ -1,5 +0,0 @@
-/home/me/Dokumente/notes/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-4d5f92818f15e465: src/main.rs
-
-/home/me/Dokumente/notes/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-4d5f92818f15e465.d: src/main.rs
-
-src/main.rs:
diff --git a/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-560dcfd44619ed7e.d b/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-560dcfd44619ed7e.d
deleted file mode 100644
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--- a/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-560dcfd44619ed7e.d
+++ /dev/null
@@ -1,5 +0,0 @@
-/home/me/Dokumente/notes/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-560dcfd44619ed7e.rmeta: src/main.rs
-
-/home/me/Dokumente/notes/school/intro-crypto/uebung/03/u03/target/debug/deps/u03-560dcfd44619ed7e.d: src/main.rs
-
-src/main.rs:
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