diff --git a/exercise/python/day00/main.py b/exercise/python/day00/main.py
new file mode 100644
index 000000000..0d1167f5d
--- /dev/null
+++ b/exercise/python/day00/main.py
@@ -0,0 +1,8 @@
+from exercise.python.day00.encryption_email.encryption import Encryption
+from exercise.python.day00.tests.utils import load_file, convert_key, convert_iv
+
+if __name__ == '__main__':
+    contents = load_file("EncryptedEmail.txt")
+    key = convert_key('Advent Of Craft')
+    iv = convert_iv('2024')
+    print(Encryption(key, iv).decrypt(contents))
diff --git a/exercise/python/day05/eid.py b/exercise/python/day05/eid.py
new file mode 100644
index 000000000..c2836ef30
--- /dev/null
+++ b/exercise/python/day05/eid.py
@@ -0,0 +1,38 @@
+from enum import Enum
+
+MIN_SN = 1
+MAX_SN = 999
+
+
+class ElvenSex(Enum):
+    SLOUBI = "SLOUBI"
+    GAGNA = "GAGNA"
+    CATACT = "CATACT"
+
+
+class Eid:
+    @staticmethod
+    def generate(sex: ElvenSex, sn: int, birth_year: int) -> str:
+        prefix = Eid.format_sex(sex) + Eid.format_birth_year(birth_year) + Eid.validate_and_format(sn)
+        control_key = Eid.format_control_key(prefix)
+        return prefix + control_key
+
+    @staticmethod
+    def format_sex(sex: ElvenSex) -> str:
+        if type(sex) != ElvenSex:
+            raise ValueError(f"sex {sex} is not an ElvenSex")
+        return {ElvenSex.SLOUBI: "1", ElvenSex.GAGNA: "2", ElvenSex.CATACT: "3"}[sex]
+
+    @staticmethod
+    def format_birth_year(birth_year: int):
+        return "{:02d}".format(birth_year % 100)
+
+    @staticmethod
+    def validate_and_format(sn: int) -> str:
+        if sn < MIN_SN or sn > MAX_SN:
+            raise ValueError(f"sn {sn} is out of range [{MIN_SN}, {MAX_SN}]")
+        return "{:03d}".format(sn)
+
+    @staticmethod
+    def format_control_key(prefix: str) -> str:
+        return "{:02d}".format(97 - (int(prefix) % 97))
diff --git a/exercise/python/day05/tests/test_eid.py b/exercise/python/day05/tests/test_eid.py
index f63a47929..4e7f7f2d4 100644
--- a/exercise/python/day05/tests/test_eid.py
+++ b/exercise/python/day05/tests/test_eid.py
@@ -2,10 +2,74 @@
 
 from assertpy import assert_that
 
+from eid import Eid, ElvenSex
+
 
 class EIDTest(unittest.TestCase):
-    def test_eid(self):
-        assert_that(42).is_equal_to("Universe")
+
+    def generate_and_check_eid(self, *args, **kwargs):
+        eid = Eid.generate(*args, **kwargs)
+        assert_that(eid).is_length(8)
+        try:
+            int(eid)
+        except ValueError:
+            raise AssertionError(f"eid {eid} is not an number")
+        return eid
+
+    def test_eid_sloubi(self):
+        eid = self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=0, sn=1)
+        assert_that(eid).starts_with("1")
+
+    def test_eid_gagna(self):
+        eid = self.generate_and_check_eid(ElvenSex.GAGNA, birth_year=0, sn=1)
+        assert_that(eid).starts_with("2")
+
+    def test_eid_catact(self):
+        eid = self.generate_and_check_eid(ElvenSex.CATACT, birth_year=0, sn=1)
+        assert_that(eid).starts_with("3")
+
+    def test_eid_sex_must_be_elven_sex(self):
+        with self.assertRaises(ValueError):
+            self.generate_and_check_eid(sex="MALE", birth_year=0, sn=1)
+
+    def test_eid_birthyear(self):
+        eid = self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=1950, sn=1)
+        assert_that(eid[1:3]).is_equal_to("50")
+
+    def test_eid_birthyear_has_leading_zero(self):
+        eid = self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=1, sn=1)
+        assert_that(eid[1:3]).is_equal_to("01")
+
+    def test_eid_sn(self):
+        eid = self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=1, sn=123)
+        assert_that(eid[3:6]).is_equal_to("123")
+
+    def test_eid_sn_has_leading_zero(self):
+        eid = self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=1, sn=5)
+        assert_that(eid[3:6]).is_equal_to("005")
+
+    def test_eid_cannot_be_out_of_bound(self):
+        with self.assertRaises(ValueError):
+            self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=1, sn=1000)
+        with self.assertRaises(ValueError):
+            self.generate_and_check_eid(ElvenSex.SLOUBI, birth_year=1, sn=0)
+
+    @staticmethod
+    def check_eid_control_key_match_first_6_digits(eid):
+        prefix = eid[:6]
+        control_key = eid[6:]
+        assert_that((int(prefix) + int(control_key)) % 97).is_equal_to(0)
+
+    def test_eid_control_key(self):
+        for birth_year in range(100):
+            eid = self.generate_and_check_eid(sex=ElvenSex.SLOUBI, birth_year=birth_year, sn=1)
+            self.check_eid_control_key_match_first_6_digits(eid)
+        for sn in range(1, 999):
+            eid = self.generate_and_check_eid(sex=ElvenSex.SLOUBI, birth_year=1, sn=sn)
+            self.check_eid_control_key_match_first_6_digits(eid)
+        for sex in ElvenSex:
+            eid = self.generate_and_check_eid(sex=sex, birth_year=1, sn=1)
+            self.check_eid_control_key_match_first_6_digits(eid)
 
 
 if __name__ == "__main__":