diff --git a/.gitignore b/.gitignore
index 968f8e0..b83d222 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-*/*/target
+/target/
diff --git a/set1/challenge1_hex2base64/Cargo.lock b/Cargo.lock
similarity index 83%
rename from set1/challenge1_hex2base64/Cargo.lock
rename to Cargo.lock
index 00d99a3..1f006d9 100644
--- a/set1/challenge1_hex2base64/Cargo.lock
+++ b/Cargo.lock
@@ -12,10 +12,13 @@ dependencies = [
 ]
 
 [[package]]
-name = "cfg-if"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
+name = "detect_xor"
+version = "0.1.0"
+dependencies = [
+ "env_logger",
+ "log 0.3.9",
+ "rustc-serialize",
+]
 
 [[package]]
 name = "env_logger"
@@ -27,6 +30,15 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "fixed_xor"
+version = "0.1.0"
+dependencies = [
+ "env_logger",
+ "log 0.3.9",
+ "rustc-serialize",
+]
+
 [[package]]
 name = "hex2base64"
 version = "0.1.0"
@@ -48,9 +60,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.45"
+version = "0.2.151"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d2857ec59fadc0773853c664d2d18e7198e83883e7060b63c924cb077bd5c74"
+checksum = "302d7ab3130588088d277783b1e2d2e10c9e9e4a16dd9050e6ec93fb3e7048f4"
 
 [[package]]
 name = "log"
@@ -58,17 +70,14 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 dependencies = [
- "log 0.4.6",
+ "log 0.4.20",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.6"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
-dependencies = [
- "cfg-if",
-]
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "memchr"
@@ -100,9 +109,9 @@ checksum = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
 
 [[package]]
 name = "rustc-serialize"
-version = "0.3.24"
+version = "0.3.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
+checksum = "fe834bc780604f4674073badbad26d7219cadfb4a2275802db12cbae17498401"
 
 [[package]]
 name = "thread-id"
@@ -140,3 +149,12 @@ name = "winapi-build"
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 checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+
+[[package]]
+name = "xor_cipher"
+version = "0.1.0"
+dependencies = [
+ "env_logger",
+ "log 0.3.9",
+ "rustc-serialize",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4a619d6
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[workspace]
+
+members = [
+  "set1/challenge1_hex2base64",
+  "set1/challenge2_fixed_xor",
+  "set1/challenge3_xor_cipher",
+  "set1/challenge4_detect_xor",
+]
diff --git a/set1/challenge2_fixed_xor/Cargo.lock b/set1/challenge2_fixed_xor/Cargo.lock
deleted file mode 100644
index 55f40c6..0000000
--- a/set1/challenge2_fixed_xor/Cargo.lock
+++ /dev/null
@@ -1,140 +0,0 @@
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