diff --git a/src/extension/background-script/CryptoServices/getMyProveBio.ts b/src/extension/background-script/CryptoServices/getMyProveBio.ts
index b76e16cd14f..692d4bb1ece 100644
--- a/src/extension/background-script/CryptoServices/getMyProveBio.ts
+++ b/src/extension/background-script/CryptoServices/getMyProveBio.ts
@@ -8,6 +8,6 @@ export async function getMyProveBio(whoAmI: PersonIdentifier): Promise<string |
     const myIdentity = await queryMyIdentityAtDB(whoAmI)
     if (!myIdentity) return null
     const pub = await crypto.subtle.exportKey('jwk', myIdentity.publicKey)
-    const compressed = compressSecp256k1Key(pub)
+    const compressed = compressSecp256k1Key(pub, 'public')
     return getNetworkWorker(whoAmI.network).publicKeyEncoder(compressed)
 }
diff --git a/src/extension/background-script/CryptoServices/verifyOthersProve.ts b/src/extension/background-script/CryptoServices/verifyOthersProve.ts
index 2b80204d523..c07645e102a 100644
--- a/src/extension/background-script/CryptoServices/verifyOthersProve.ts
+++ b/src/extension/background-script/CryptoServices/verifyOthersProve.ts
@@ -8,7 +8,7 @@ import { import_ECDH_256k1_Key } from '../../../utils/crypto.subtle'
 export async function verifyOthersProve(bio: string, others: PersonIdentifier): Promise<boolean> {
     const compressedX = getNetworkWorker(others.network).publicKeyDecoder(bio)
     if (!compressedX) return false
-    const key = decompressSecp256k1Key(compressedX)
+    const key = decompressSecp256k1Key(compressedX, 'public')
     let publicKey: CryptoKey
     try {
         publicKey = await import_ECDH_256k1_Key(key)
diff --git a/src/utils/mnemonic-code/index.ts b/src/utils/mnemonic-code/index.ts
index f4ac1593b26..b63386e2d0c 100644
--- a/src/utils/mnemonic-code/index.ts
+++ b/src/utils/mnemonic-code/index.ts
@@ -41,7 +41,7 @@ export async function recover_ECDH_256k1_KeyPair_ByMnemonicWord(mnemonicWord: st
 }
 
 function HDKeyToJwk(hdk: wallet.HDKey): JsonWebKey {
-    const jwk = decompressSecp256k1Key(encodeArrayBuffer(hdk.publicKey))
+    const jwk = decompressSecp256k1Key(encodeArrayBuffer(hdk.publicKey), 'public')
     jwk.d = hdk.privateKey ? Convert.ToBase64Url(hdk.privateKey) : undefined
     return jwk
 }
diff --git a/src/utils/type-transform/BackupFileShortRepresentation.ts b/src/utils/type-transform/BackupFileShortRepresentation.ts
index cba0248e4a4..9db1ac3333f 100644
--- a/src/utils/type-transform/BackupFileShortRepresentation.ts
+++ b/src/utils/type-transform/BackupFileShortRepresentation.ts
@@ -25,8 +25,8 @@ export function compressBackupFile(file: BackupJSONFileLatest): string {
         userId,
         nickname,
         localKey.k,
-        compressSecp256k1Key(publicKey),
-        compressSecp256k1Key(privateKey),
+        compressSecp256k1Key(publicKey, 'public'),
+        compressSecp256k1Key(privateKey, 'private'),
         grantedHostPermissions.join(';'),
     ].join('🤔')
 }
@@ -60,8 +60,8 @@ export function decompressBackupFile(short: string): BackupJSONFileLatest {
                 },
                 network,
                 nickname,
-                privateKey: decompressSecp256k1Key(privateKey),
-                publicKey: decompressSecp256k1Key(publicKey),
+                privateKey: decompressSecp256k1Key(privateKey, 'private'),
+                publicKey: decompressSecp256k1Key(publicKey, 'public'),
                 userId,
             },
         ],
diff --git a/src/utils/type-transform/SECP256k1-Compression.ts b/src/utils/type-transform/SECP256k1-Compression.ts
index d6f1bd35914..7373994f788 100644
--- a/src/utils/type-transform/SECP256k1-Compression.ts
+++ b/src/utils/type-transform/SECP256k1-Compression.ts
@@ -27,12 +27,15 @@ function decompressSecp256k1Point(point: ArrayBuffer): { x: string; y: string }
     return { x: Convert.ToBase64Url(x), y: Convert.ToBase64Url(y) }
 }
 
-export function compressSecp256k1Key(key: JsonWebKey): string {
+export function compressSecp256k1Key(key: JsonWebKey, type: 'public' | 'private'): string {
+    if (type === 'private' && !key.d) throw new Error('Private key does not contain secret')
     const arr = compressSecp256k1Point(key.x!, key.y!)
-    return encodeArrayBuffer(arr)
+    return encodeArrayBuffer(arr) + (type === 'private' ? '🙈' + key.d! : '')
 }
-export function decompressSecp256k1Key(compressed: string): JsonWebKey {
-    const arr = decodeArrayBuffer(compressed)
+export function decompressSecp256k1Key(compressed: string, type: 'public' | 'private'): JsonWebKey {
+    const [compressedPublic, privateKey] = compressed.split('🙈')
+    if (type === 'private' && privateKey.length < 1) throw new Error('Private key does not contain secret')
+    const arr = decodeArrayBuffer(compressedPublic)
     const key = decompressSecp256k1Point(arr)
     return {
         crv: 'K-256',
@@ -41,5 +44,6 @@ export function decompressSecp256k1Key(compressed: string): JsonWebKey {
         y: key.y,
         key_ops: ['deriveKey'],
         kty: 'EC',
+        d: type === 'private' ? privateKey : undefined,
     }
 }