diff --git a/pySim/esim/saip/personalization.py b/pySim/esim/saip/personalization.py
index 663ba02c..e780516e 100644
--- a/pySim/esim/saip/personalization.py
+++ b/pySim/esim/saip/personalization.py
@@ -131,6 +131,7 @@ class ConfigurableParameter:
     max_len = None
     allow_len = None # a list of specific lengths
     default_value = None
+    default_source = None # a param_source.ParamSource subclass
 
     def __init__(self, input_value=None):
         self.input_value = input_value # the raw input value as given by caller
@@ -346,6 +347,7 @@ class Iccid(DecimalParam):
     min_len = 18
     max_len = 20
     default_value = '0' * 18
+    default_source = param_source.IncDigitSource
 
     @classmethod
     def validate_val(cls, val):
@@ -379,6 +381,7 @@ class Imsi(DecimalParam):
     min_len = 6
     max_len = 15
     default_value = '00101' + ('0' * 10)
+    default_source = param_source.IncDigitSource
 
     @classmethod
     def apply_val(cls, pes: ProfileElementSequence, val):
@@ -411,6 +414,7 @@ class SdKey(BinaryParam):
     key_id = None
     kvn = None
     key_usage_qual = None
+    default_source = param_source.RandomHexDigitSource
 
     @classmethod
     def _apply_sd(cls, pe: ProfileElement, value):
@@ -567,6 +571,7 @@ class Puk(DecimalHexParam):
     rpad = 16
     keyReference = None
     default_value = '0' * allow_len
+    default_source = param_source.RandomDigitSource
 
     @classmethod
     def apply_val(cls, pes: ProfileElementSequence, val):
@@ -604,6 +609,7 @@ class Pin(DecimalHexParam):
     min_len = 4
     max_len = 8
     default_value = '0' * max_len
+    default_source = param_source.RandomDigitSource
     keyReference = None
 
     @staticmethod
@@ -715,6 +721,7 @@ class AlgorithmID(DecimalParam, AlgoConfig):
     algo_config_key = 'algorithmID'
     allow_len = 1
     default_value = 1  # Milenage
+    default_source = param_source.ConstantSource
 
     @classmethod
     def validate_val(cls, val):
@@ -733,6 +740,7 @@ class K(BinaryParam, AlgoConfig):
     algo_config_key = 'key'
     allow_len = int(128/8) # length in bytes (from BinaryParam)
     default_value = '00' * allow_len
+    default_source = param_source.RandomHexDigitSource
 
 class Opc(K):
     name = 'OPc'