diff --git a/readme.md b/readme.md
index 9c39f41..ee8b1c2 100644
--- a/readme.md
+++ b/readme.md
@@ -1,12 +1,14 @@
 # CipherSweet for Laravel
 
-A Laravel implementation of [Paragon Initiative Enterprises CipherSweet](https://ciphersweet.paragonie.com) searchable field level encryption.
+A Laravel implementation of [Paragon Initiative Enterprises CipherSweet](https://ciphersweet.paragonie.com) searchable
+field level encryption.
 
 Make sure you have some basic understanding of CipherSweet before continuing.
 
 ## Installation
 
 Install the package using composer:
+
 ```
 composer require bjorn-voesten/ciphersweet-for-laravel
 ```
@@ -16,10 +18,13 @@ The package will then automatically register itself.
 #### Encryption key
 
 In your `.env` file you should add:
+
 ```dotenv
 CIPHERSWEET_KEY=
 ```
+
 And then generate an encryption key:
+
 ```
 php artisan ciphersweet:key
 ```
@@ -27,6 +32,7 @@ php artisan ciphersweet:key
 #### Config file
 
 Publish the config file:
+
 ```
 php artisan vendor:publish --tag=ciphersweet-config
 ```
@@ -35,8 +41,9 @@ php artisan vendor:publish --tag=ciphersweet-config
 
 ### Define encryption
 
-Add the `BjornVoesten\CipherSweet\Concerns\WithAttributeEncryption` trait to your model <br> 
+Add the `BjornVoesten\CipherSweet\Concerns\WithAttributeEncryption` trait to your model <br>
 and add the `BjornVoesten\CipherSweet\Casts\Encrypted` cast to the attributes you want to encrypt.
+
 ```php
 <?php
 
@@ -99,29 +106,42 @@ class User extends Model
 
 Attributes will be automatically encrypted and decrypted when filling and retrieving attribute values.
 
-**Note** Because the package uses Laravel casts it is not possible to combine the `Encrypted` cast and accessors/mutators.  
+**Note** Because the package uses Laravel casts it is not possible to combine the `Encrypted` cast and
+accessors/mutators.
 
 ### Searching
 
-**Note** When searching with the `equal to` operator models will be returned when the value is found in one of all available or defined indexes. When searching with the `not equal to` operator all models where the value is not found in any of the available or the defined indexes are returned. 
+**Note** When searching with the `equal to` operator models will be returned when the value is found in one of all
+available or defined indexes. When searching with the `not equal to` operator all models where the value is not found in
+any of the available or the defined indexes are returned.
 
 **Note**
-Because of the limited search possibilities in CipherSweet only the `=` and `!=` operators are available when searching encrypted attributes. 
+Because of the limited search possibilities in CipherSweet only the `=` and `!=` operators are available when searching
+encrypted attributes.
 
-#### `whereEncrypted`
+<br/>
+
+#### `whereEncrypted`, `orWhereEncrypted`
 
 ```php
  User::query()
     ->whereEncrypted('social_security_number', '=', '123-456-789')
+    ->orWhereEncrypted('social_security_number', '=', '123-456-789')
     ->get();
 ```
 
-#### `orWhereEncrypted`
+<br/>
+
+#### `whereInEncrypted`, `orWhereInEncrypted`
 
 ```php
  User::query()
-    ->whereEncrypted('social_security_number', '=', '123-456-789')
-    ->orWhereEncrypted('social_security_number', '=', '456-123-789')
+    ->whereInEncrypted('social_security_number', [
+        '123-456-789',
+    ])
+    ->orWhereInEncrypted('social_security_number', [
+        '456-123-789',
+    ])
     ->get();
 ```
 
@@ -131,7 +151,8 @@ Please see [contributing.md](contributing.md) for details and a todolist.
 
 ## Security
 
-If you discover any security related issues, please email [security@bjornvoesten.com](mailto:security@bjornvoesten.com) instead of using the issue tracker.
+If you discover any security related issues, please email [security@bjornvoesten.com](mailto:security@bjornvoesten.com)
+instead of using the issue tracker.
 
 ## Testing
 
diff --git a/src/Concerns/WithAttributeEncryption.php b/src/Concerns/WithAttributeEncryption.php
index 4e9699e..5e9ef14 100644
--- a/src/Concerns/WithAttributeEncryption.php
+++ b/src/Concerns/WithAttributeEncryption.php
@@ -3,7 +3,6 @@
 namespace BjornVoesten\CipherSweet\Concerns;
 
 use Illuminate\Database\Eloquent\Builder;
-use Illuminate\Support\Arr;
 
 /**
  * @mixin \Illuminate\Database\Eloquent\Model
@@ -16,9 +15,8 @@ trait WithAttributeEncryption
      * @param string $attribute
      * @param string|int|boolean $value
      * @return array
-     * @throws \Exception
      */
-    public function encrypt(string $attribute, $value)
+    public function encrypt(string $attribute, $value): array
     {
         [$ciphertext, $indexes] = $result = app('ciphersweet')->encrypt(
             $this, $attribute, $value
@@ -37,9 +35,9 @@ trait WithAttributeEncryption
      * Encrypt the attribute.
      *
      * @param string $attribute
-     * @return $this
+     * @return string
      */
-    public function decrypt(string $attribute)
+    public function decrypt(string $attribute): string
     {
         return app('ciphersweet')->decrypt(
             $this, $attribute, $this->attributes[$attribute]
@@ -54,27 +52,25 @@ trait WithAttributeEncryption
      * @param $operator
      * @param $value
      * @param array $indexes
+     * @param string $boolean
      * @return void
-     * @throws \Exception
      */
-    public function scopeWhereEncrypted(Builder $query, string $column, $operator, $value, array $indexes = []): void
+    public function scopeWhereEncrypted(Builder $query, string $column, $operator, $value, array $indexes = [], $boolean = 'and'): void
     {
-        $available = Arr::last(
-            $this->encrypt($column, $value)
-        );
+        /** @var array $available */
+        $available = $this->encrypt($column, $value)[1];
 
-        $indexes = empty($indexes)
-            ? array_keys($available)
-            : $indexes;
+        $indexes = empty($indexes) ? array_keys($available) : $indexes;
 
-        $first = true;
-        foreach ($indexes as $index) {
-            $first
-                ? $query->where($index, $operator, $available[$index])
-                : $query->orWhere($index, $operator, $available[$index]);
+        $method = $boolean === 'or'
+            ? 'orWhere'
+            : 'where';
 
-            $first = false;
-        }
+        $query->{$method}(function (Builder $query) use ($available, $operator, $indexes) {
+            foreach ($indexes as $key => $index) {
+                $query->where($index, $operator, $available[$index]);
+            }
+        });
     }
 
     /**
@@ -83,23 +79,76 @@ trait WithAttributeEncryption
      * @param \Illuminate\Database\Eloquent\Builder $query
      * @param string $column
      * @param string $operator
-     * @param $value
+     * @param mixed $value
      * @param array $indexes
+     * @param string $boolean
+     * @return void
+     */
+    public function scopeOrWhereEncrypted(
+        Builder $query, string $column, string $operator, $value,
+        array $indexes = [], $boolean = 'or'
+    ): void
+    {
+        $this->scopeWhereEncrypted(
+            $query, $column, $operator, $value, $indexes, $boolean
+        );
+    }
+
+    /**
+     * Add a where in clause to the query for an encrypted column.
+     *
+     * @param \Illuminate\Database\Eloquent\Builder $query
+     * @param string $column
+     * @param array $values
+     * @param array $indexes
+     * @param string $boolean
      * @return void
      * @throws \Exception
      */
-    public function scopeOrWhereEncrypted(Builder $query, string $column, string $operator, $value, array $indexes = []): void
+    public function scopeWhereInEncrypted(
+        Builder $query, string $column, array $values, array $indexes = [],
+        $boolean = 'and'
+    ): void
     {
-        $available = Arr::last(
-            $this->encrypt($column, $value)
+        $values = array_map(function (string $value) use ($column) {
+            return $this->encrypt($column, $value)[1];
+        }, $values);
+
+        $available = array_keys($values[0]);
+
+        $indexes = empty($indexes) ? $available : $indexes;
+
+        $method = $boolean === 'or'
+            ? 'orWhere'
+            : 'where';
+
+        $query->{$method}(function (Builder $query) use ($values, $indexes) {
+            foreach ($indexes as $key => $index) {
+                (bool) $key
+                    ? $query->orWhereIn($index, $values)
+                    : $query->whereIn($index, $values);
+            }
+        });
+    }
+
+    /**
+     * Add a or where in clause to the query for an encrypted column.
+     *
+     * @param \Illuminate\Database\Eloquent\Builder $query
+     * @param string $column
+     * @param array $values
+     * @param array $indexes
+     * @param string $boolean
+     * @return void
+     * @throws \Exception
+     */
+    public function scopeOrWhereInEncrypted(
+        Builder $query, string $column, array $values, array $indexes = [],
+        $boolean = 'or'
+    ): void
+    {
+        $this->scopeWhereInEncrypted(
+            $query, $column, $values, $indexes, $boolean
         );
-
-        $indexes = empty($indexes)
-            ? array_keys($available)
-            : $indexes;
-
-        foreach ($indexes as $index) {
-            $query->orWhere($index, $operator, $available[$index]);
-        }
     }
 }
diff --git a/tests/Unit/QueryTest.php b/tests/Unit/QueryTest.php
index 9ac8f8c..0fa2cad 100644
--- a/tests/Unit/QueryTest.php
+++ b/tests/Unit/QueryTest.php
@@ -98,4 +98,118 @@ class QueryTest extends TestCase
             ])
             ->get();
     }
+
+    public function testCanQueryEncryptedAttributeWithWhereInClause(): void
+    {
+        $userOne = $this->user('123-456-789');
+        $userTwo = $this->user('789-456-123');
+        $userThree = $this->user('456-789-123');
+
+        // Assert success.
+        /** @var \Illuminate\Database\Eloquent\Collection $keys */
+        $keys = User::query()
+            ->whereInEncrypted(
+                'social_security_number',
+                [
+                    '123-456-789',
+                    '789-456-123',
+                ]
+            )
+            ->get()
+            ->modelKeys();
+
+        $this->assertContains($userOne->id, $keys);
+        $this->assertContains($userTwo->id, $keys);
+        $this->assertNotContains($userThree->id, $keys);
+
+        // Assert success using provided index.
+        /** @var \Illuminate\Database\Eloquent\Collection $keys */
+        $keys = User::query()
+            ->whereInEncrypted(
+                'social_security_number',
+                [
+                    '123-456-789',
+                    '789-456-123',
+                ],
+                ['social_security_number_index']
+            )
+            ->get()
+            ->modelKeys();
+
+        $this->assertContains($userOne->id, $keys);
+        $this->assertContains($userTwo->id, $keys);
+        $this->assertNotContains($userThree->id, $keys);
+
+        $keys = User::query()
+            ->whereInEncrypted(
+                'social_security_number',
+                ['789-456-123'],
+                ['non_existing_index']
+            )
+            ->get()
+            ->modelKeys();
+
+        $this->assertEmpty($keys);
+    }
+
+    public function testCanQueryEncryptedAttributeWithOrWhereInClause(): void
+    {
+        $userOne = $this->user('123-456-789');
+        $userTwo = $this->user('789-456-123');
+        $userThree = $this->user('456-789-123');
+
+        // Assert success.
+        /** @var \Illuminate\Database\Eloquent\Collection $keys */
+        $keys = User::query()
+            ->whereInEncrypted(
+                'social_security_number',
+                ['123-456-789']
+            )
+            ->orWhereInEncrypted(
+                'social_security_number',
+                ['789-456-123']
+            )
+            ->get()
+            ->modelKeys();
+
+        $this->assertContains($userOne->id, $keys);
+        $this->assertContains($userTwo->id, $keys);
+        $this->assertNotContains($userThree->id, $keys);
+
+        // Assert success using provided index.
+        /** @var \Illuminate\Database\Eloquent\Collection $keys */
+        $keys = User::query()
+            ->whereInEncrypted(
+                'social_security_number',
+                ['123-456-789'],
+                ['social_security_number_index']
+            )
+            ->orWhereInEncrypted(
+                'social_security_number',
+                ['789-456-123'],
+                ['social_security_number_index']
+            )
+            ->get()
+            ->modelKeys();
+
+        $this->assertContains($userOne->id, $keys);
+        $this->assertContains($userTwo->id, $keys);
+        $this->assertNotContains($userThree->id, $keys);
+
+        $keys = User::query()
+            ->whereInEncrypted(
+                'social_security_number',
+                ['789-456-123'],
+                ['non_existing_index']
+            )
+            ->orWhereInEncrypted(
+                'social_security_number',
+                ['789-456-123'],
+                ['non_existing_index']
+            )
+            ->get()
+            ->modelKeys();
+
+        $this->assertEmpty($keys);
+    }
 }