diff --git a/Cargo.lock b/Cargo.lock
index 7aa054625702c42aef90a3d063ae39deb6b454ec..69a91e3d7d69f99d5107e4571e388a1bb1e0aed6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,33 +2,32 @@
 # It is not intended for manual editing.
 [[package]]
 name = "aes"
-version = "0.4.0"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f7001367fde4c768a19d1029f0a8be5abd9308e1119846d5bd9ad26297b8faf5"
+checksum = "884391ef1066acaa41e766ba8f596341b96e93ce34f9a43e7d24bf0a0eaf0561"
 dependencies = [
  "aes-soft",
  "aesni",
- "block-cipher",
+ "cipher",
 ]
 
 [[package]]
 name = "aes-soft"
-version = "0.4.0"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4925647ee64e5056cf231608957ce7c81e12d6d6e316b9ce1404778cc1d35fa7"
+checksum = "be14c7498ea50828a38d0e24a765ed2effe92a705885b57d029cd67d45744072"
 dependencies = [
- "block-cipher",
- "byteorder",
+ "cipher",
  "opaque-debug",
 ]
 
 [[package]]
 name = "aesni"
-version = "0.7.0"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d050d39b0b7688b3a3254394c3e30a9d66c41dcf9b05b0e2dbdc623f6505d264"
+checksum = "ea2e11f5e94c2f7d386164cc2aa1f97823fed6f259e486940a71c174dd01b0ce"
 dependencies = [
- "block-cipher",
+ "cipher",
  "opaque-debug",
 ]
 
@@ -81,9 +80,9 @@ dependencies = [
 
 [[package]]
 name = "base64"
-version = "0.12.3"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
+checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
 [[package]]
 name = "bitflags"
@@ -106,20 +105,11 @@ dependencies = [
  "digest",
 ]
 
-[[package]]
-name = "block-cipher"
-version = "0.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa136449e765dc7faa244561ccae839c394048667929af599b5d931ebe7b7f10"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "bs58"
-version = "0.3.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "476e9cd489f9e121e02ffa6014a8ef220ecb15c05ed23fc34cca13925dc283fb"
+checksum = "771fe0050b883fcc3ea2359b1a96bcfbc090b7116eae7c3c512c7a083fdf23d3"
 
 [[package]]
 name = "bumpalo"
@@ -129,9 +119,9 @@ checksum = "63396b8a4b9de3f4fdfb320ab6080762242f66a8ef174c49d8e19b674db4cdbe"
 
 [[package]]
 name = "byteorder"
-version = "1.3.4"
+version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
+checksum = "ae44d1a3d5a19df61dd0c8beb138458ac2a53a7ac09eba97d55592540004306b"
 
 [[package]]
 name = "cbindgen"
@@ -169,6 +159,15 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "cipher"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12f8e7987cbd042a63249497f41aed09f8e65add917ea6566effbc56578d6801"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "clang"
 version = "0.24.0"
@@ -222,9 +221,9 @@ dependencies = [
 
 [[package]]
 name = "cryptoxide"
-version = "0.3.0"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2824e117f942b77e942b14162316711d66f07d14b0f37a44fa4b4cad592b8fa"
+checksum = "46212f5d1792f89c3e866fb10636139464060110c568edd7f73ab5e9f736c26d"
 
 [[package]]
 name = "dart-bindgen"
@@ -261,9 +260,9 @@ dependencies = [
 
 [[package]]
 name = "dup-crypto"
-version = "0.43.2"
+version = "0.44.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5612539417a1204863d10dda1cb313fe7a34da8596d30fa93da8af125c928abb"
+checksum = "e4281497a99e7bb67d54800671558d707c48ca35320f8c5747fb0eda4d8cbc71"
 dependencies = [
  "aes",
  "arrayvec",
@@ -273,7 +272,7 @@ dependencies = [
  "byteorder",
  "cryptoxide",
  "ed25519-bip32",
- "getrandom",
+ "getrandom 0.2.2",
  "once_cell",
  "ring",
  "serde",
@@ -335,7 +334,18 @@ checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
- "wasi",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.10.2+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -425,9 +435,9 @@ checksum = "13bd41f508810a131401606d54ac32a467c97172d74ba7662562ebba5ad07fa0"
 
 [[package]]
 name = "opaque-debug"
-version = "0.2.3"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
+checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
 [[package]]
 name = "ppv-lite86"
@@ -459,7 +469,7 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
- "getrandom",
+ "getrandom 0.1.16",
  "libc",
  "rand_chacha",
  "rand_core",
@@ -482,7 +492,7 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 dependencies = [
- "getrandom",
+ "getrandom 0.1.16",
 ]
 
 [[package]]
@@ -538,18 +548,18 @@ checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
 name = "serde"
-version = "1.0.118"
+version = "1.0.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06c64263859d87aa2eb554587e2d23183398d617427327cf2b3d0ed8c69e4800"
+checksum = "92d5161132722baa40d802cc70b15262b98258453e85e5d1d365c757c73869ae"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.118"
+version = "1.0.123"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c84d3526699cd55261af4b941e4e725444df67aa4f9e6a3564f18030d12672df"
+checksum = "9391c295d64fc0abb2c556bad848f33cb8296276b1ad2677d1ae1ace4f258f31"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -596,9 +606,9 @@ checksum = "1e81da0851ada1f3e9d4312c704aa4f8806f0f9d69faaf8df2f3464b4a9437c2"
 
 [[package]]
 name = "syn"
-version = "1.0.57"
+version = "1.0.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4211ce9909eb971f111059df92c45640aad50a619cf55cd76476be803c4c68e6"
+checksum = "c700597eca8a5a762beb35753ef6b94df201c81cca676604f547495a0d7f0081"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -642,18 +652,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.23"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76cc616c6abf8c8928e2fdcc0dbfab37175edd8fb49a4641066ad1364fdab146"
+checksum = "e0f4a65597094d4483ddaed134f409b2cb7c1beccf25201a9f73c719254fa98e"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.23"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9be73a2caec27583d0046ef3796c3794f868a5bc813db689eed00c7631275cd1"
+checksum = "7765189610d8241a44529806d6fd1f2e0a08734313a35d5b3a556f92b381f3c0"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -717,6 +727,12 @@ version = "0.9.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
+[[package]]
+name = "wasi"
+version = "0.10.2+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.70"
diff --git a/lib/models/generateWallets.dart b/lib/models/generateWallets.dart
index d7947eb1f16f4e194bef844b5bdf848058dc195c..c7b7281d909a799356155d8e012948864e843fe5 100644
--- a/lib/models/generateWallets.dart
+++ b/lib/models/generateWallets.dart
@@ -159,10 +159,10 @@ class GenerateWalletsProvider with ChangeNotifier {
   Future<NewWallet> generateWallet(generatedMnemonic) async {
     try {
       this.actualWallet = await DubpRust.genWalletFromMnemonic(
-          language: Language.french,
-          mnemonic: generatedMnemonic,
-          secretCodeType: SecretCodeType.letters,
-          walletType: WalletType.bip32Ed25519);
+        language: Language.french,
+        mnemonic: generatedMnemonic,
+        secretCodeType: SecretCodeType.letters,
+      );
     } catch (e) {
       print(e);
     }
diff --git a/native/dubp_rs/Cargo.toml b/native/dubp_rs/Cargo.toml
index 8d195985d20449389af32321a0d9f6cf2246d2d2..6468d2e7d093ba5bf1b26a378c834d206a6b007a 100644
--- a/native/dubp_rs/Cargo.toml
+++ b/native/dubp_rs/Cargo.toml
@@ -11,10 +11,10 @@ crate-type = ["rlib"]
 
 [dependencies]
 allo-isolate = "0.1.6"
-dup-crypto = { version = "0.43.2", features = ["bip32-ed25519", "dewif", "mnemonic", "mnemonic_french", "scrypt"] }
+dup-crypto = { version = "0.44.0", features = ["bip32-ed25519", "dewif", "mnemonic", "mnemonic_french", "scrypt"] }
 fast-threadpool = { version = "0.3.0", default-features = false }
 once_cell = { version = "1.3.1", default-features = false, features = ["std"] }
-thiserror = "1.0.23"
+thiserror = "1.0.24"
 
 [build-dependencies]
 cbindgen = "0.14.3"
diff --git a/native/dubp_rs/src/dewif.rs b/native/dubp_rs/src/dewif.rs
index c017d69488f59dc3b2e131e9f31d55a1ce801164..c05ad85d1152027c82861e9aabca096a1f42c532 100644
--- a/native/dubp_rs/src/dewif.rs
+++ b/native/dubp_rs/src/dewif.rs
@@ -42,7 +42,6 @@ pub(super) fn gen_dewif(
     member_wallet: bool,
     secret_code_type: SecretCodeType,
     system_memory: i64,
-    wallet_type: WalletType,
 ) -> Result<Vec<String>, DubpError> {
     let currency = parse_currency(currency)?;
     let mnemonic =
@@ -52,17 +51,10 @@ pub(super) fn gen_dewif(
     let log_n = log_n(system_memory);
     let secret_code = gen_secret_code(member_wallet, secret_code_type, log_n)?;
 
-    let dewif = match wallet_type {
-        WalletType::Bip32Ed25519 => {
-            let keypair = dup_crypto::keys::ed25519::bip32::KeyPair::from_seed(seed.clone());
-            let pubkey = keypair.public_key();
-            dup_crypto::dewif::write_dewif_v4_content(currency, log_n, &secret_code, &pubkey, seed)
-        }
-        WalletType::Ed25519 => {
-            let keypair = KeyPairFromSeed32Generator::generate(seed);
-            dup_crypto::dewif::write_dewif_v3_content(currency, &keypair, log_n, &secret_code)
-        }
-    };
+    let keypair = dup_crypto::keys::ed25519::bip32::KeyPair::from_seed(seed.clone());
+    let pubkey = keypair.public_key();
+    let dewif =
+        dup_crypto::dewif::write_dewif_v4_content(currency, log_n, &secret_code, &pubkey, seed);
 
     Ok(vec![dewif, secret_code])
 }
diff --git a/native/dubp_rs/src/dewif/bip32.rs b/native/dubp_rs/src/dewif/bip32.rs
index 374dcaf87a4c4634915fffda7852e19777919a2b..1fa982cb29938ddf412cde55dcbb9b648ab10ce3 100644
--- a/native/dubp_rs/src/dewif/bip32.rs
+++ b/native/dubp_rs/src/dewif/bip32.rs
@@ -15,12 +15,31 @@
 
 use crate::*;
 
+const MEMBER_ACCOUNT_INDEX: u32 = 0;
+
 pub(crate) fn get_accounts_pubkeys(
     currency: Currency,
     dewif: &str,
     secret_code: &str,
     accounts_indexs: Vec<DerivationIndex>,
 ) -> Result<Vec<String>, DubpError> {
+    if accounts_indexs.contains(
+        &DerivationIndex::hard(MEMBER_ACCOUNT_INDEX).map_err(DubpError::InvalidDerivationIndex)?,
+    ) {
+        if crate::secret_code::is_ascii_letters(secret_code) {
+            let log_n =
+                dup_crypto::dewif::read_dewif_log_n(ExpectedCurrency::Specific(currency), dewif)
+                    .map_err(DubpError::DewifReadError)?;
+            let expected_secret_code_len =
+                crate::secret_code::compute_secret_code_len(true, SecretCodeType::Letters, log_n)?;
+
+            if secret_code.len() < expected_secret_code_len {
+                return Err(DubpError::SecretCodeTooShort);
+            }
+        } else {
+            return Err(DubpError::InvalidSecretCodeType);
+        }
+    }
     let mut keypairs = dup_crypto::dewif::read_dewif_file_content(
         ExpectedCurrency::Specific(currency),
         dewif,
diff --git a/native/dubp_rs/src/error.rs b/native/dubp_rs/src/error.rs
index 379a48c7be90cc0a5280338409fd9e21ea75fbe1..33f60a6a7d563b7fa8974e2dd718e090861f73d6 100644
--- a/native/dubp_rs/src/error.rs
+++ b/native/dubp_rs/src/error.rs
@@ -22,20 +22,24 @@ use crate::*;
 pub(crate) enum DubpError {
     #[error("{0}")]
     DewifReadError(DewifReadError),
-    #[error("I/O error: {0}")]
-    IoErr(io::Error),
-    #[error("{0}")]
-    InvalidDerivationIndex(InvalidDerivationIndex),
     #[error("Digits secret code forbid for member wallet")]
     DigitsCodeForbidForMemberWallet,
     #[error("It is forbidden to retrieve the master public key of an HD wallet.")]
     GetMasterPubkeyOfHdWallet,
+    #[error("I/O error: {0}")]
+    IoErr(io::Error),
+    #[error("{0}")]
+    InvalidDerivationIndex(InvalidDerivationIndex),
+    #[error("Invalid secret code type")]
+    InvalidSecretCodeType,
     #[error("this wallet is not an HD wallet")]
     NotHdWallet,
     #[error("this account index is not a transparent account index")]
     NotTransparentAccountIndex,
     #[error("A given parameter is null")]
     NullParamErr,
+    #[error("Secret code too short: please change your secret code")]
+    SecretCodeTooShort,
     #[error("fail to generate random bytes")]
     RandErr,
     #[error("Unknown currency name")]
diff --git a/native/dubp_rs/src/lib.rs b/native/dubp_rs/src/lib.rs
index 6109089622430353661b6d6e7b8b6c4df20dc9a3..544d1c412bd8d57dc8ee7df90dff159a4577fd3a 100644
--- a/native/dubp_rs/src/lib.rs
+++ b/native/dubp_rs/src/lib.rs
@@ -87,7 +87,6 @@ pub extern "C" fn gen_dewif(
     member_wallet: u32,
     secret_code_type: u32,
     system_memory: i64,
-    wallet_type: u32,
 ) {
     exec_async(
         port,
@@ -97,7 +96,6 @@ pub extern "C" fn gen_dewif(
             let mnemonic = char_ptr_to_str(mnemonic)?;
             let member_wallet = member_wallet != 0;
             let secret_code_type = SecretCodeType::from(secret_code_type);
-            let wallet_type = WalletType::from(wallet_type);
             Ok((
                 currency,
                 language,
@@ -105,18 +103,9 @@ pub extern "C" fn gen_dewif(
                 member_wallet,
                 secret_code_type,
                 system_memory,
-                wallet_type,
             ))
         },
-        |(
-            currency,
-            language,
-            mnemonic,
-            member_wallet,
-            secret_code_type,
-            system_memory,
-            wallet_type,
-        )| {
+        |(currency, language, mnemonic, member_wallet, secret_code_type, system_memory)| {
             dewif::gen_dewif(
                 currency,
                 language,
@@ -124,7 +113,6 @@ pub extern "C" fn gen_dewif(
                 member_wallet,
                 secret_code_type,
                 system_memory,
-                wallet_type,
             )
         },
     )
diff --git a/native/dubp_rs/src/secret_code.rs b/native/dubp_rs/src/secret_code.rs
index 2020b3760c8a97ffb631615bdc35c8e46161e7df..ae42d23366d62b148e361cd9c7289f3b58210178 100644
--- a/native/dubp_rs/src/secret_code.rs
+++ b/native/dubp_rs/src/secret_code.rs
@@ -58,6 +58,14 @@ pub(crate) fn gen_secret_code(
     }
 }
 
+pub(crate) fn is_ascii_letters(secret_code: &str) -> bool {
+    secret_code.len()
+        == secret_code
+            .chars()
+            .filter(|char| char.is_ascii_alphabetic())
+            .count()
+}
+
 fn gen_random_digits(n: usize) -> Result<String, DubpError> {
     let mut digits_string = dup_crypto::rand::gen_u32()
         .map_err(|_| DubpError::RandErr)?
diff --git a/packages/dubp_rs/README.md b/packages/dubp_rs/README.md
index 2c27fe87ee7fc45cb3dfe84d3350fffb487afd59..958eb82c4309552a2a58792ab4fa66385dd953e1 100644
--- a/packages/dubp_rs/README.md
+++ b/packages/dubp_rs/README.md
@@ -144,10 +144,11 @@ NewWallet new_wallet = await DubpRust.genWalletFromMnemonic(
 #### Function signature
 
 ```dart
-static Future<String> sign({
+static Future<String> signBip32Transparent({
+    int accountIndex,
     String currency = "g1",
     String dewif,
-    String pin,
+    String secretCode,
     String message
 });
 ```
@@ -157,7 +158,8 @@ If the wallet is not dedicated to the Äž1 currency, you must indicate the curren
 #### Usage example
 
 ```dart
-String signature = await DubpRust.sign(
+String signature = await DubpRust.signBip32Transparent(
+    accountIndex: 3,
     dewif: "AAAAARAAAAGfFDAs+jVZYkfhBlHZZ2fEQIvBqnG16g5+02cY18wSOjW0cUg2JV3SUTJYN2CrbQeRDwGazWnzSFBphchMmiL0",
     pin: "CDJ4UB",
     message: "toto"
diff --git a/packages/dubp_rs/lib/dubp.dart b/packages/dubp_rs/lib/dubp.dart
index d4d41634b1e185c5cccb38d53bf61d89d6fc3499..ee4ee9bdf16f827aca80d7cc00b4428b36345824 100644
--- a/packages/dubp_rs/lib/dubp.dart
+++ b/packages/dubp_rs/lib/dubp.dart
@@ -156,7 +156,6 @@ class DubpRust {
     Language language = Language.english,
     String mnemonic,
     SecretCodeType secretCodeType = SecretCodeType.letters,
-    WalletType walletType = WalletType.ed25519,
   }) async {
     int ram = SysInfo.getTotalPhysicalMemory();
     print('ram=$ram');
@@ -172,7 +171,6 @@ class DubpRust {
       0,
       secretCodeType.index,
       ram,
-      walletType.index,
     );
     List<String> newWallet = await completer.future;
 
@@ -263,24 +261,6 @@ class DubpRust {
     return completer.future;
   }
 
-  /// Sign the message `message` with `dewif` keypair encryted in DEWIF format.
-  ///
-  /// If you have several messages to sign, use `signSeveral` method instead.
-  static Future<String> sign(
-      {String currency = "g1", String dewif, String pin, String message}) {
-    final completer = Completer<String>();
-    final sendPort =
-        singleCompletePort<String, String>(completer, callback: _handleErr);
-    native.sign(
-      sendPort.nativePort,
-      Utf8.toUtf8(currency),
-      Utf8.toUtf8(dewif),
-      Utf8.toUtf8(pin),
-      Utf8.toUtf8(message),
-    );
-    return completer.future;
-  }
-
   /// Sign the message `message` with `dewif` Bip32-Ed25519 keypair encryted
   /// in DEWIF format.
   ///
@@ -323,33 +303,6 @@ class DubpRust {
     return completer.future;
   }
 
-  /// Sign several messages `messages` with `dewif` keypair encryted in DEWIF
-  /// format.
-  ///
-  /// This method is optimized to sign several messages at once. If you have
-  /// several messages to sign, avoid calling the `sign` method for each
-  /// message. Use this `signSeveral` method instead.
-  static Future<List<String>> signSeveral(
-      {String currency = "g1",
-      String dewif,
-      String pin,
-      List<String> messages}) {
-    final completer = Completer<List<String>>();
-    final sendPort = singleCompletePort<List<String>, List>(completer,
-        callback: _handleErrList);
-
-    native.sign_several(
-      sendPort.nativePort,
-      Utf8.toUtf8(currency),
-      Utf8.toUtf8(dewif),
-      Utf8.toUtf8(pin),
-      messages.length,
-      _listStringToPtr(messages),
-    );
-
-    return completer.future;
-  }
-
   /// Sign several messages `messages` with `dewif` keypair encryted in DEWIF
   /// format.
   ///