diff --git a/base-asymmetric-encryption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/Mnemonic.kt b/base-asymmetric-encryption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/Mnemonic.kt
index 223cf5081..7c2344278 100644
--- a/base-asymmetric-encryption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/Mnemonic.kt
+++ b/base-asymmetric-encryption/src/commonMain/kotlin/io/iohk/atala/prism/apollo/utils/Mnemonic.kt
@@ -16,15 +16,25 @@ final class Mnemonic {
 
         private const val PBKDF2C = 2048
         private const val PBKDF2DKLen = 64
+        class InvalidMnemonicCode(code: String) : RuntimeException(code)
+
+        fun isValidMnemonicCode(code: Array<String>): Boolean {
+            return code.all { it in MnemonicCodeEnglish.wordList }
+        }
 
         fun createRandomMnemonics(): Array<String> {
             val entropyBytes = SecureRandom.generateSeed(SEED_ENTROPY_BITS_24_WORDS / 8)
             return MnemonicCode(MnemonicCodeEnglish.wordList.toTypedArray()).toMnemonic(entropyBytes)
         }
 
-        fun createSeed(mnemonics: String, passphrase: String = "AtalaPrism"): ByteArray {
+        @Throws(InvalidMnemonicCode::class)
+        fun createSeed(mnemonics: Array<String>, passphrase: String = "AtalaPrism"): ByteArray {
+            if (!isValidMnemonicCode(mnemonics)) {
+                throw InvalidMnemonicCode(mnemonics.joinToString(separator = " "))
+            }
+            val mnemonicString = mnemonics.joinToString(separator = " ")
             return PBKDF2SHA512.derive(
-                mnemonics,
+                mnemonicString,
                 passphrase,
                 PBKDF2C,
                 PBKDF2DKLen
@@ -32,7 +42,7 @@ final class Mnemonic {
         }
 
         fun createRandomSeed(passphrase: String = "AtalaPrism"): ByteArray {
-            val mnemonics = this.createRandomMnemonics().joinToString(separator = " ")
+            val mnemonics = this.createRandomMnemonics()
             return this.createSeed(mnemonics, passphrase)
         }
     }
diff --git a/base-asymmetric-encryption/src/commonTest/kotlin/io/iohk/atala/prism/apollo/utils/MnemonicTests.kt b/base-asymmetric-encryption/src/commonTest/kotlin/io/iohk/atala/prism/apollo/utils/MnemonicTests.kt
index dbaa5cced..c6009110d 100644
--- a/base-asymmetric-encryption/src/commonTest/kotlin/io/iohk/atala/prism/apollo/utils/MnemonicTests.kt
+++ b/base-asymmetric-encryption/src/commonTest/kotlin/io/iohk/atala/prism/apollo/utils/MnemonicTests.kt
@@ -4,11 +4,20 @@ import io.iohk.atala.prism.apollo.hashing.internal.toHexString
 import kotlin.test.Test
 import kotlin.test.assertContains
 import kotlin.test.assertEquals
+import kotlin.test.assertFailsWith
+import kotlin.test.assertFalse
 
 class MnemonicTests {
+
+    @Test
+    fun testValidateMnemonics() {
+        val invalidMnemonics = arrayOf("abc", "ddd", "inv")
+        assertFalse(Mnemonic.isValidMnemonicCode(invalidMnemonics))
+    }
+
     @Test
     fun testCreateRandomMnemonics() {
-        val mnemonics = Mnemonic.createRandomMnemonics().joinToString(separator = " ")
+        val mnemonics = Mnemonic.createRandomMnemonics()
         val seed = Mnemonic.createSeed(mnemonics)
         assertEquals(seed.size, 64)
     }
@@ -21,24 +30,34 @@ class MnemonicTests {
 
     @Test
     fun testCreateSeed() {
-        val mnemonics = "random seed mnemonic words"
+        val mnemonics = arrayOf("adjust", "animal", "anger", "around")
         val seed = Mnemonic.createSeed(mnemonics)
 
         assertEquals(seed.size, 64)
 
         val privateKey = seed.slice(IntRange(0, 31))
-        assertContains(privateKey.toByteArray().toHexString(), "feac83cecc84531575eb67250a03d8ac112d4d6678674968bf3f6576ad028ae3")
+        assertContains(privateKey.toByteArray().toHexString(), "a078d8a0f3beca52ef17a1d0279eb6e9c410cd3837d3db38d31e43df6da95ac6")
+    }
+
+    @Test
+    fun testCreateSeedInvalidMnemonics() {
+        val mnemonics = arrayOf("abc", "ddd", "adsada", "testing")
+
+        assertFailsWith<Mnemonic.Companion.InvalidMnemonicCode> {
+            Mnemonic.createSeed(mnemonics)
+        }
     }
 
     @Test
     fun testCreateSeedWithPW() {
-        val mnemonics = "random seed mnemonic words"
+        val mnemonics = arrayOf("adjust", "animal", "anger", "around")
         val password = "123456"
         val seed = Mnemonic.createSeed(mnemonics, password)
 
         assertEquals(seed.size, 64)
 
         val privateKey = seed.slice(IntRange(0, 31))
-        assertContains(privateKey.toByteArray().toHexString(), "b3a8af66eca002e8b4ca868c5b55a8c865f15e0cfea483d6a164a6fbecf83625")
+
+        assertContains(privateKey.toByteArray().toHexString(), "815b70655ca4c9675f5fc15fe8f82315f07521d034eec45bf4d5912bd3a61218")
     }
 }