diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..b58b603
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/Node.js_challenge_dzien_3.iml b/.idea/Node.js_challenge_dzien_3.iml
new file mode 100644
index 0000000..24643cc
--- /dev/null
+++ b/.idea/Node.js_challenge_dzien_3.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..28a804d
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..b77df43
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/Node.js_challenge_dzien_3.iml" filepath="$PROJECT_DIR$/.idea/Node.js_challenge_dzien_3.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/zadanie01.js b/app/zadanie01.js
index 842f75e..199a573 100644
--- a/app/zadanie01.js
+++ b/app/zadanie01.js
@@ -1,3 +1,27 @@
 const MY_PWD_HASH = '5dca0fc4e306d92b2077ad85e7c4bd87a3e8648e';
 
-//Twój kod
\ No newline at end of file
+//Twój kod
+
+const crypto = require('crypto');
+
+const passwords = ['??TegoHasła',
+    'CodersLab',
+    'Node.js Szyfruje Pliki',
+    'Zaźółć Gęślą Jaźń',
+    'Moje Haslo 1@3!',
+    '111#$((@)n',
+    'Dzisiaj Szyfruje 83'
+]
+
+const algorithms = ['sha256', 'sha512', 'md5', 'rmd160'];
+
+algorithms.forEach(algoritm => {
+    passwords.forEach(pasword => {
+        let hash = crypto.createHmac(algoritm, pasword)
+            .digest('hex');
+
+        if (MY_PWD_HASH === hash) {
+            console.log(`algoritm - ${algoritm}, pasword - ${pasword}`);
+        }
+    })
+})
diff --git a/app/zadanieDnia1.js b/app/zadanieDnia1.js
index 8c20173..e59ebc7 100644
--- a/app/zadanieDnia1.js
+++ b/app/zadanieDnia1.js
@@ -1 +1,20 @@
-//Twój kod
\ No newline at end of file
+//Twój kod
+const fs = require('fs');
+const crypto = require('crypto');
+
+const codeFunc = (linkToFile) => {
+    fs.readFile(linkToFile, 'utf8', (err, data) => {
+        if (err === null) {
+            console.log(data);
+            const hash = crypto.createHmac('sha256', data)
+                .digest('hex');
+            console.log(hash);
+        } else {
+            console.log(err);
+        }
+    })
+}
+
+const linkToSomeText = './data/zadanieDnia1/testFile.txt';
+
+codeFunc(linkToSomeText);
diff --git a/app/zadanieDnia2.js b/app/zadanieDnia2.js
index 85846f4..6ea0936 100644
--- a/app/zadanieDnia2.js
+++ b/app/zadanieDnia2.js
@@ -1,3 +1,16 @@
 const ENCRYPTED_TEXT = '4f9fa8f98650091c4910f5b597773c0a48278cfb001fe4eb3ff47ada85cbf0ed3dc17016b031e1459e6e4d9b001ab6e102c11e834a98dce9530c9668c47b76ee6f09d075d19a38e48b415e067c6ddcfad0d3526c405a4f4f2fb1e7502f303c40';
 
-//Twój kod
\ No newline at end of file
+//Twój kod
+
+const crypto = require('crypto');
+const algorithms = ['aes192', 'aes-256-cbc', 'aes-256-ecb'];
+const pass = 'PysęjkkyDw';
+function decodeText(encodedText, password, algorithm) {
+    const decipher = crypto.createDecipher(algorithm, password);
+
+    let decrypted = decipher.update(encodedText, 'hex', 'utf8');
+    decrypted += decipher.final('utf8');
+    return decrypted;
+}
+
+decodeText(ENCRYPTED_TEXT, pass, 'aes-256-ecb');
\ No newline at end of file