diff --git a/backend/src/utils/crypto.ts b/backend/src/utils/crypto.ts
new file mode 100644
index 0000000..43acf5e
--- /dev/null
+++ b/backend/src/utils/crypto.ts
@@ -0,0 +1,14 @@
+import { createHash, randomBytes, randomUUID } from 'node:crypto';
+
+export function randomId(bytes = 6) {
+  return randomBytes(bytes).toString('base64url');
+}
+
+export function newUuid() {
+  return randomUUID();
+}
+
+export function sha256(value: string) {
+  return createHash('sha256').update(value).digest('hex');
+}
+