diff --git a/services/comm-services-lib/Cargo.lock b/services/comm-services-lib/Cargo.lock
index 4997da04b..ca4187209 100644
--- a/services/comm-services-lib/Cargo.lock
+++ b/services/comm-services-lib/Cargo.lock
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 [[package]]
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  "windows_i686_gnu 0.42.1",
  "windows_i686_msvc 0.42.1",
  "windows_x86_64_gnu 0.42.1",
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 [[package]]
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  "windows_aarch64_msvc 0.48.0",
  "windows_i686_gnu 0.48.0",
  "windows_i686_msvc 0.48.0",
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 [[package]]
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 checksum = "8c9864e83243fdec7fc9c5444389dcbbfd258f745e7853198f365e3c4968a608"
 
 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 checksum = "628bfdf232daa22b0d64fdb62b09fcc36bb01f05a3939e20ab73aaf9470d0463"
 
 [[package]]
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 checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
 
 [[package]]
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 version = "0.42.1"
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 checksum = "447660ad36a13288b1db4d4248e857b510e8c3a225c822ba4fb748c0aafecffd"
 
 [[package]]
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 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
 
 [[package]]
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 [[package]]
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 [[package]]
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5556e6ee25d32df2586c098bbfa278803692a20d0ab9565e049480d52707ec8c"
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diff --git a/services/comm-services-lib/Cargo.toml b/services/comm-services-lib/Cargo.toml
index 93df327eb..16ba0f92d 100644
--- a/services/comm-services-lib/Cargo.toml
+++ b/services/comm-services-lib/Cargo.toml
@@ -1,53 +1,57 @@
 [package]
 name = "comm-services-lib"
 version = "0.1.0"
 edition = "2021"
 license = "BSD-3-Clause"
 
 [features]
 blob-client = [
   "dep:bytes",
   "dep:reqwest",
   "dep:futures-core",
   "dep:futures-util",
 ]
 http = [
   "dep:actix-cors",
   "dep:actix-web",
   "dep:actix-multipart",
   "dep:futures-core",
   "dep:futures-util",
   "dep:http",
   "dep:tokio-stream",
   "dep:actix-web-httpauth",
 ]
+crypto = ["dep:aead", "dep:aes-gcm", "dep:bytes"]
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 aws-config = "0.55"
 aws-sdk-dynamodb = "0.27"
 aws-types = "0.55"
 base64 = "0.21"
 chrono = "0.4"
 derive_more = "0.99"
 rand = "0.8"
 tokio = "1.32"
 tracing = "0.1"
 anyhow = "1.0.74"
 # blob client dependencies
 bytes = { version = "1.4", optional = true }
 futures-core = { version = "0.3", optional = true }
 futures-util = { version = "0.3", optional = true }
 reqwest = { version = "0.11", features = [
   "json",
   "multipart",
   "stream",
 ], optional = true }
 # http dependencies
 actix-cors = { version = "0.6", optional = true }
 actix-web = { version = "4.3", optional = true }
 http = { version = "0.2.9", optional = true }
 actix-web-httpauth = { version = "0.8.0", optional = true }
 actix-multipart = { version = "0.6", optional = true }
 tokio-stream = { version = "0.1.14", optional = true }
+# crypto dependencies
+aes-gcm = { version = "0.10", optional = true }
+aead = { version = "0.5", features = ["bytes"], optional = true }
diff --git a/services/comm-services-lib/src/crypto/aes256.rs b/services/comm-services-lib/src/crypto/aes256.rs
new file mode 100644
index 000000000..c987724ba
--- /dev/null
+++ b/services/comm-services-lib/src/crypto/aes256.rs
@@ -0,0 +1,122 @@
+use aead::{
+  generic_array::GenericArray, Aead, AeadCore, AeadInPlace, KeyInit, OsRng,
+};
+use aes_gcm::Aes256Gcm;
+use aws_sdk_dynamodb::types::AttributeValue;
+use bytes::BytesMut;
+
+use crate::database::{DBItemError, TryFromAttribute};
+
+pub use aes_gcm::Error as AES256Error;
+
+const TAG_LEN: usize = 16;
+const NONCE_LEN: usize = 12;
+
+#[derive(Clone, Debug, derive_more::From, derive_more::AsRef)]
+pub struct EncryptionKey(aes_gcm::Key<Aes256Gcm>);
+
+impl EncryptionKey {
+  /// Generates a new AES256 key.
+  pub fn new() -> EncryptionKey {
+    Aes256Gcm::generate_key(&mut OsRng).into()
+  }
+}
+
+impl Default for EncryptionKey {
+  fn default() -> Self {
+    Self::new()
+  }
+}
+
+// database conversions
+impl From<EncryptionKey> for AttributeValue {
+  fn from(key: EncryptionKey) -> Self {
+    use aws_sdk_dynamodb::primitives::Blob;
+    AttributeValue::B(Blob::new(key.0.to_vec()))
+  }
+}
+impl TryFromAttribute for EncryptionKey {
+  fn try_from_attr(
+    attribute_name: impl Into<String>,
+    attribute: Option<AttributeValue>,
+  ) -> Result<Self, DBItemError> {
+    let bytes = Vec::<u8>::try_from_attr(attribute_name, attribute)?;
+    let key = aes_gcm::Key::<Aes256Gcm>::from_slice(&bytes);
+    Ok(Self(*key))
+  }
+}
+
+/// Encrypts a plaintext with the given key. Returns the sealed data
+/// in the following format: nonce || ciphertext || tag
+pub fn encrypt(
+  plaintext: &[u8],
+  key: &EncryptionKey,
+) -> Result<Vec<u8>, AES256Error> {
+  let cipher = Aes256Gcm::new(key.as_ref());
+  let nonce = Aes256Gcm::generate_nonce(&mut OsRng);
+
+  // Construct an output buffer: nonce || ciphertext || tag
+  // Then split it into nonce and ciphertext || tag,
+  // encrypt and concatenate again.
+  // This is done on contiguous memory to avoid extra allocations.
+
+  let mut output =
+    BytesMut::with_capacity(nonce.len() + plaintext.len() + TAG_LEN);
+  output.extend_from_slice(&nonce);
+  output.extend_from_slice(plaintext);
+
+  let mut buffer = output.split_off(nonce.len());
+  cipher.encrypt_in_place(&nonce, b"", &mut buffer)?;
+  output.unsplit(buffer);
+
+  Ok(output.into())
+}
+
+/// Decrypts a ciphertext with the given key. Expects the sealed data
+/// in the following format: nonce || ciphertext || tag
+pub fn decrypt(
+  ciphertext: &[u8],
+  key: &EncryptionKey,
+) -> Result<Vec<u8>, AES256Error> {
+  if ciphertext.len() < NONCE_LEN + TAG_LEN {
+    return Err(AES256Error);
+  }
+  let cipher = Aes256Gcm::new(key.as_ref());
+  let nonce = GenericArray::from_slice(&ciphertext[..NONCE_LEN]);
+  cipher.decrypt(nonce, &ciphertext[NONCE_LEN..])
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn test_aes256() {
+    let key = EncryptionKey::new();
+    let plaintext = b"hello world";
+    let ciphertext = encrypt(plaintext, &key).expect("Encrypt failed");
+    let decrypted = decrypt(&ciphertext, &key).expect("Decrypt failed");
+    assert_eq!(plaintext, &decrypted[..]);
+  }
+
+  #[test]
+  fn test_aes256_invalid_key() {
+    let key = EncryptionKey::new();
+    let plaintext = b"hello world";
+    let ciphertext = encrypt(plaintext, &key).expect("Encrypt failed");
+
+    let other_key = EncryptionKey::new();
+    decrypt(&ciphertext, &other_key).expect_err("Decrypt should fail");
+  }
+
+  #[test]
+  fn test_aes256_malfolmed() {
+    let key = EncryptionKey::new();
+    let plaintext = b"hello world";
+    let mut ciphertext = encrypt(plaintext, &key).expect("Encrypt failed");
+
+    ciphertext[0] ^= 0xaa; // do the flip
+
+    decrypt(&ciphertext, &key).expect_err("Decrypt should fail");
+  }
+}
diff --git a/services/comm-services-lib/src/crypto/mod.rs b/services/comm-services-lib/src/crypto/mod.rs
new file mode 100644
index 000000000..b0235e340
--- /dev/null
+++ b/services/comm-services-lib/src/crypto/mod.rs
@@ -0,0 +1,2 @@
+/// AES 256 GCM encryption and decryption.
+pub mod aes256;
diff --git a/services/comm-services-lib/src/lib.rs b/services/comm-services-lib/src/lib.rs
index f5575a452..16f9cf947 100644
--- a/services/comm-services-lib/src/lib.rs
+++ b/services/comm-services-lib/src/lib.rs
@@ -1,17 +1,19 @@
 pub mod auth;
 pub mod backup;
 pub mod blob;
 pub mod constants;
+#[cfg(feature = "crypto")]
+pub mod crypto;
 pub mod database;
 #[cfg(feature = "http")]
 pub mod http;
 pub mod tools;
 
 mod reexports {
   #[cfg(feature = "blob-client")]
   pub use {bytes, reqwest};
 
   #[cfg(feature = "http")]
   pub use {actix_web, http};
 }
 pub use reexports::*;