diff --git a/src/auth.py b/src/auth.py
index c1a9dc745d1227920615d3aab727d77c9240b8b0..a557799f18f09f56129c030057a2219fbf1edd64 100644
--- a/src/auth.py
+++ b/src/auth.py
@@ -10,7 +10,7 @@ import os
 
 def auth_method(c):
     if c.contains_switches('auth-scrypt'):
-        return auth_by_scrypt()
+        return auth_by_scrypt(c)
     if c.contains_switches('auth-seed'):
         return auth_by_seed()
     if c.contains_switches('auth-file'):
@@ -59,19 +59,24 @@ def auth_by_seed():
     return seed
 
 
-def auth_by_scrypt():
+def auth_by_scrypt(c):
     salt = input("Please enter your Scrypt Salt (Secret identifier): ")
     password = getpass.getpass("Please enter your Scrypt password (masked): ")
-    scrypt_param = input("Please enter your Scrypt parameters (N,r,p):" +
-                         "default [4096,16,1]: ")
-    if not scrypt_param:
-        scrypt_param = "4096,16,1"
-    scrypt_param_splited = scrypt_param.split(",")
-    n = int(scrypt_param_splited[0])
-    r = int(scrypt_param_splited[1])
-    p = int(scrypt_param_splited[2])
-    if (n <= 0 or n > 65536 or r <= 0 or r > 512 or p <= 0 or p > 32):
-        print("Error: the values of Scrypt parameters are not good")
+        
+    if c.contains_definitions('n') and c.contains_definitions('r') and c.contains_definitions('p'):
+        n, r, p = c.get_definition('n'), c.get_definition('r'), c.get_definition('p')
+        if n.isnumeric() and r.isnumeric() and p.isnumeric():
+            n, r, p = int(n), int(r), int(p)
+            if n <= 0 or n > 65536 or r <= 0 or r > 512 or p <= 0 or p > 32:
+                print("Error: the values of Scrypt parameters are not good")
+                exit(1)
+        else:
+            print("one of n, r or p is not a number")
+            exit(1)
+    else:
+        print("Using default values. Scrypt parameters not specified or wrong format")
+        n, r, p = 4096, 16, 1
+    print("Scrypt parameters used: N: {0}, r: {1}, p: {2}".format(n, r, p))
 
     return get_seed_from_scrypt(salt, password, n, r, p)
 
diff --git a/src/silkaj.py b/src/silkaj.py
index 4e6f0f9a5beec1f2832177d800ce865ef7f710fd..637e382272c937054aeaa398dc45c040dbb5a938 100755
--- a/src/silkaj.py
+++ b/src/silkaj.py
@@ -18,15 +18,19 @@ def usage():
     \n - info: Display information about currency \
     \n \
     \n - amount: Get amount of one account \
-    \n      --pubkey=<pubkey[:checksum]> | --auth-scrypt\
-    \n      --auth-seed | --auth-file | --auth-wif\
+    \n      --pubkey=<pubkey[:checksum]>\
+    \n      --auth-scrypt [script parameters -n <N> -r <r> -p <p>] (default: 4096,16,1)\
+    \n      --auth-seed | --auth-file [--file=<path file>] | --auth-wif\
     \n \
     \n - transaction: Send transaction\
-    \n     --auth-scrypt | --auth-seed | --auth-file [--file=<path file>] | --auth-wif\
-    \n     --amountDU=<relative value> | --amount=<quantitative value>\
+    \n     - authentication:\
+    \n         --auth-scrypt [script parameters -n <N> -r <r> -p <p>] (default: 4096,16,1)\
+    \n         --auth-seed | --auth-file [--file=<path file>] | --auth-wif\
+    \n     - amount:\
+    \n         --amountDU=<relative value> | --amount=<quantitative value>\
+    \n         [--allSources] \
     \n     --output=<public key>[:checksum] \
     \n     [--comment=<comment>] \
-    \n     [--allSources] \
     \n     [--outputBackChange=<public key[:checksum]>] \
     \n     [-y | --yes], don't ask for prompt confirmation \
     \n \
@@ -44,8 +48,8 @@ def usage():
     \n - argos: display currency information formated for Argos or BitBar\
     \n \
     \n - generate_auth_file: Generate file to store the seed of the account\
-    \n      --auth-scrypt | --auth-seed | --auth-wif\
-    \n      [--file=<path file>] \
+    \n      --auth-scrypt [script parameters -n <N> -r <r> -p <p>] (default: 4096,16,1)\
+    \n      --auth-seed | --auth-file [--file=<path file>] | --auth-wif\
     \n \
     \n - id <pubkey> or <identity>: get corresponding identity or pubkey from pubkey or identity.\
     \n      it could autocomplete the pubkey corresponding to an identity with three or four following characters.")