diff --git a/package.json b/package.json
index f605848..b60a5bb 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
   },
 
   "dependencies": {
+    "log": "git+git@git.pband.ch:typescript/log",
     "result": "git+git@git.pband.ch:typescript/result.git"
   },
   "devDependencies": {
diff --git a/src/pwd.ts b/src/pwd.ts
index 1804fc3..378fdbd 100644
--- a/src/pwd.ts
+++ b/src/pwd.ts
@@ -1,7 +1,16 @@
+import logger from 'log'
+const log = logger('crypto-server:pwd')
+
 export function hash(pwd: string) : Promise<string> {
+    log.debug('hash password')
     return Bun.password.hash(pwd)
 }
 
 export async function verify(pwd: string, hash: string) : Promise<boolean> {
-    return Bun.password.verify(pwd, hash).catch(() => false)
+    log.debug("verify password's hash")
+    return Bun.password.verify(pwd, hash).catch(e => {
+        log.warn('Password verification failed')
+        log.debug(`Error : ${e}`)
+        return false
+    })
 }