diff --git a/services/commtest/Cargo.lock b/services/commtest/Cargo.lock
index ac0f7bc2c..a36f2e1e7 100644
--- a/services/commtest/Cargo.lock
+++ b/services/commtest/Cargo.lock
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 
 [[package]]
 name = "winreg"
 version = "0.50.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
 dependencies = [
  "cfg-if",
  "windows-sys",
 ]
 
 [[package]]
 name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
 dependencies = [
  "zeroize_derive",
 ]
 
 [[package]]
 name = "zeroize_derive"
 version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.48",
 ]
diff --git a/services/commtest/Cargo.toml b/services/commtest/Cargo.toml
index 5af08eb91..f8528659c 100644
--- a/services/commtest/Cargo.toml
+++ b/services/commtest/Cargo.toml
@@ -1,33 +1,35 @@
 [package]
 name = "commtest"
 version = "0.1.0"
 edition = "2021"
 license = "BSD-3-Clause"
 
 [dependencies]
 comm-opaque2 = { path = "../../shared/comm-opaque2" }
 grpc_clients = { path = "../../shared/grpc_clients" }
 backup_client = { path = "../../shared/backup_client" }
+base64 = "0.21.2"
+ed25519-dalek = "1"
 tonic = "0.8"
 tokio = { version = "1.24", features = ["macros", "rt-multi-thread"] }
 prost = "0.11"
 async-stream = "0.3.2"
 derive_more = "0.99.16"
 bytesize = "1.1.0"
 lazy_static = "1.4.0"
 num_cpus = "1.13.1"
 sha2 = "0.10.2"
 hex = "0.4.3"
 tokio-tungstenite = "0.18.0"
 tunnelbroker_messages = { path = "../../shared/tunnelbroker_messages" }
 url = "2.3.1"
 futures-util = "0.3.28"
 serde_json = "1.0.96"
-rand = "0.8.5"
+rand = "0.7.3"
 reqwest = { version = "0.11", features = ["json", "multipart", "stream"] }
 serde = "1.0"
 comm-lib = { path = "../../shared/comm-lib" }
 uuid = { version = "1.2", features = ["v4"] }
 
 [build-dependencies]
 tonic-build = "0.8"
diff --git a/services/commtest/src/identity/mod.rs b/services/commtest/src/identity/mod.rs
index 2563814b2..47a45bb1a 100644
--- a/services/commtest/src/identity/mod.rs
+++ b/services/commtest/src/identity/mod.rs
@@ -1,2 +1,68 @@
+use base64::Engine;
+use ed25519_dalek::{ed25519::signature::SignerMut, Keypair, Signature};
+use rand::rngs::OsRng;
+use serde_json::json;
+
+use self::olm_account_infos::{
+  ClientPublicKeys, IdentityPublicKeys, DEFAULT_CLIENT_KEYS,
+};
+
 pub mod device;
 pub mod olm_account_infos;
+
+pub struct SigningCapableAccount {
+  signing_key: Keypair,
+}
+
+impl SigningCapableAccount {
+  pub fn new() -> Self {
+    let mut rng = OsRng {};
+    let signing_key = Keypair::generate(&mut rng);
+    Self { signing_key }
+  }
+
+  /// returns device public keys, required for device key upload
+  pub fn public_keys(&self) -> ClientPublicKeys {
+    let default = DEFAULT_CLIENT_KEYS.clone();
+    let signing_public_key = self.signing_key.public.to_bytes();
+    let ed25519 = base64::engine::general_purpose::STANDARD_NO_PAD
+      .encode(signing_public_key);
+
+    ClientPublicKeys {
+      primary_identity_public_keys: IdentityPublicKeys {
+        ed25519,
+        ..default.primary_identity_public_keys
+      },
+      ..default
+    }
+  }
+
+  /// signs message, returns signature
+  pub fn sign_message(&mut self, message: &str) -> String {
+    let signature: Signature = self.signing_key.sign(message.as_bytes());
+    base64::engine::general_purpose::STANDARD_NO_PAD
+      .encode(signature.to_bytes())
+  }
+
+  /// returns value for challenge_response gRPC field
+  pub fn sign_nonce(&mut self, nonce: String) -> String {
+    let message = json!({
+      "nonce": nonce
+    });
+    let message_str =
+      serde_json::to_string(&message).expect("message stringify failed");
+    let message_signature = self.sign_message(&message_str);
+
+    let response = json!({
+      "message": message_str,
+      "signature": message_signature,
+    });
+    serde_json::to_string(&response).expect("response stringify failed")
+  }
+}
+
+impl Default for SigningCapableAccount {
+  fn default() -> Self {
+    Self::new()
+  }
+}