diff --git a/neofs/layer/auth.go b/neofs/layer/auth.go
index 6970290..d6e32fe 100644
--- a/neofs/layer/auth.go
+++ b/neofs/layer/auth.go
@@ -1,6 +1,7 @@
 package layer
 
 import (
+	"crypto/ecdsa"
 	"crypto/rand"
 	"crypto/rsa"
 	"crypto/sha256"
@@ -11,39 +12,101 @@ import (
 )
 
 const (
-	GatewayKeySize = 2048
+	gatewayEncryptionKeySize = 2048
 )
 
-type keyPair struct {
-	PrivateKey *rsa.PrivateKey
-	PublicKey  *rsa.PublicKey
+type (
+	signatureKeyName  byte
+	encryptionKeyName byte
+)
+
+const (
+	_ signatureKeyName = iota
+	// Indicates that the key is a NeoFS ECDSA key.
+	gateNeoFSECDSAKey
+	gateNeoFSEd25519Key
+)
+
+const (
+	_ encryptionKeyName = iota
+	// Indicates that the key is used to encrypt
+	// a bearer token to pass auth procedure.
+	gateUserAuthKey
+)
+
+type (
+	signatureKeyPair struct {
+		PrivateKey *ecdsa.PrivateKey
+		PublicKey  *ecdsa.PublicKey
+	}
+
+	encryptionKeyPair struct {
+		PrivateKey *rsa.PrivateKey
+		PublicKey  *rsa.PublicKey
+	}
+)
+
+type secureEnclave struct {
+	signatureKeys  map[signatureKeyName]signatureKeyPair
+	encryptionKeys map[encryptionKeyName]encryptionKeyPair
 }
 
-type AuthCenter struct {
-	gatewayKeys keyPair
+func newSecureEnclave() (*secureEnclave, error) {
+	// TODO: Get private keys.
+	// TODO: Fetch NeoFS and Auth private keys from app settings.
+	return &secureEnclave{
+		signatureKeys:  map[signatureKeyName]signatureKeyPair{},
+		encryptionKeys: map[encryptionKeyName]encryptionKeyPair{},
+	}, nil
 }
 
-func NewAuthCenter() (*AuthCenter, error) {
-	var (
-		err        error
-		privateKey *rsa.PrivateKey
-	)
-	privateKey, err = pullGatewayPrivateKey()
+func (se *secureEnclave) Encrypt(keyName encryptionKeyName, data []byte) ([]byte, error) {
+	return rsa.EncryptOAEP(sha256.New(), rand.Reader, se.encryptionKeys[keyName].PublicKey, data, []byte{})
+}
+
+func (se *secureEnclave) Decrypt(keyName encryptionKeyName, data []byte) ([]byte, error) {
+	return rsa.DecryptOAEP(sha256.New(), rand.Reader, se.encryptionKeys[keyName].PrivateKey, data, []byte{})
+}
+
+var globalEnclave *secureEnclave
+
+func init() {
+	var err error
+	globalEnclave, err = newSecureEnclave()
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to pull gateway private key from trusted enclave")
+		panic("failed to initialize secure enclave")
 	}
-	if privateKey == nil {
-		if privateKey, err = rsa.GenerateKey(rand.Reader, GatewayKeySize); err != nil {
-			return nil, errors.Wrap(err, "failed to generate gateway private key")
-		}
-		if err = pushGatewayPrivateKey(privateKey); err != nil {
-			return nil, errors.Wrap(err, "failed to push gateway private key to trusted enclave")
-		}
-	}
-	ac := &AuthCenter{gatewayKeys: keyPair{
-		PrivateKey: privateKey,
-		PublicKey:  &privateKey.PublicKey,
-	}}
+}
+
+// AuthCenter is a central app's authentication/authorization management unit.
+type AuthCenter struct {
+	zstdEncoder *zstd.Encoder
+	zstdDecoder *zstd.Decoder
+}
+
+// NewAuthCenter creates an instance of AuthCenter.
+func NewAuthCenter() (*AuthCenter, error) {
+	// var (
+	// 	err        error
+	// 	privateKey *rsa.PrivateKey
+	// )
+	// secureEnclave := &SecureEnclave{}
+	// privateKey, err = secureEnclave.PullGatewayEncryptionPrivateKey()
+	// if err != nil {
+	// 	return nil, errors.Wrap(err, "failed to pull gateway private key from trusted enclave")
+	// }
+	// if privateKey == nil {
+	// 	// TODO: Move this logic to the enclave.
+	// 	if privateKey, err = rsa.GenerateKey(rand.Reader, gatewayEncryptionKeySize); err != nil {
+	// 		return nil, errors.Wrap(err, "failed to generate gateway private key")
+	// 	}
+	// 	// if err = keysEnclave.PushGatewayEncryptionPrivateKey(privateKey); err != nil {
+	// 	// 	return nil, errors.Wrap(err, "failed to push gateway private key to trusted enclave")
+	// 	// }
+	// }
+	zstdEncoder, _ := zstd.NewWriter(nil)
+	zstdDecoder, _ := zstd.NewReader(nil)
+	ac := &AuthCenter{zstdEncoder: zstdEncoder, zstdDecoder: zstdDecoder}
 	return ac, nil
 }
 
@@ -52,7 +115,7 @@ func (ac *AuthCenter) PackBearerToken(bearerToken *service.BearerTokenMsg) ([]by
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to marshal bearer token")
 	}
-	encryptedKeyID, err := ac.encrypt(compress(data))
+	encryptedKeyID, err := globalEnclave.Encrypt(gateUserAuthKey, ac.compress(data))
 	if err != nil {
 		return nil, errors.Wrap(err, "")
 	}
@@ -61,11 +124,11 @@ func (ac *AuthCenter) PackBearerToken(bearerToken *service.BearerTokenMsg) ([]by
 
 func (ac *AuthCenter) UnpackBearerToken(packedBearerToken []byte) (*service.BearerTokenMsg, error) {
 	compressedKeyID := packedBearerToken[32:]
-	encryptedKeyID, err := decompress(compressedKeyID)
+	encryptedKeyID, err := ac.decompress(compressedKeyID)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to decompress key ID")
 	}
-	keyID, err := ac.decrypt(encryptedKeyID)
+	keyID, err := globalEnclave.Decrypt(gateUserAuthKey, encryptedKeyID)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to decrypt key ID")
 	}
@@ -76,35 +139,17 @@ func (ac *AuthCenter) UnpackBearerToken(packedBearerToken []byte) (*service.Bear
 	return bearerToken, nil
 }
 
-func pullGatewayPrivateKey() (*rsa.PrivateKey, error) {
-	// TODO: Pull the private key from a persistent and trusted enclave.
-	return nil, nil
-}
-
-func pushGatewayPrivateKey(key *rsa.PrivateKey) error {
-	// TODO: Push the private key to a persistent and trusted enclave.
-	return nil
-}
-
-func (ac *AuthCenter) encrypt(data []byte) ([]byte, error) {
-	return rsa.EncryptOAEP(sha256.New(), rand.Reader, ac.gatewayKeys.PublicKey, data, []byte{})
-}
-
-func (ac *AuthCenter) decrypt(data []byte) ([]byte, error) {
-	return rsa.DecryptOAEP(sha256.New(), rand.Reader, ac.gatewayKeys.PrivateKey, data, []byte{})
-}
-
-func compress(data []byte) []byte {
+func (ac *AuthCenter) compress(data []byte) []byte {
+	ac.zstdEncoder.Reset(nil)
 	var compressedData []byte
-	zstdEncoder, _ := zstd.NewWriter(nil)
-	zstdEncoder.EncodeAll(data, compressedData)
+	ac.zstdEncoder.EncodeAll(data, compressedData)
 	return compressedData
 }
 
-func decompress(data []byte) ([]byte, error) {
+func (ac *AuthCenter) decompress(data []byte) ([]byte, error) {
+	ac.zstdDecoder.Reset(nil)
 	var decompressedData []byte
-	zstdDecoder, _ := zstd.NewReader(nil)
-	if _, err := zstdDecoder.DecodeAll(data, decompressedData); err != nil {
+	if _, err := ac.zstdDecoder.DecodeAll(data, decompressedData); err != nil {
 		return nil, err
 	}
 	return decompressedData, nil