Free Online Security ASN.1 Messages Decoder

This online decoder allows decoding of ASN.1 encoded security messages (PDU). No ASN.1 syntaxes are required. Simply choose the ASN.1 interface you want to use and supply the data.

Available ASN.1 syntaxes are PKCS #1 (RFC 3447), PKCS #10 (RFC 2986), PKCS #15 (RSA), PKIX Certificate and CRL Profile (X.509/RFC 5280), and Cryptographic Message Syntax (RFC 5652).

For other application domains please use another decoder on the right.

Supported ASN.1 encoded inputs are raw (binary), Base64 or hexadecimal format. The generated output is in XML format.

Decode from file upload

Select a security message (*):
Upload the ASN.1 encoded message (max. 500 KB). Only the first PDU from the file will be decoded.
Specify the format of the input file:
Base64
Binary
Hexadecimal

Decode from direct input

Select a security message (*):
Copy below your base64 encoding (max. 100 KB). Only the first PDU will be decoded.
# Below is an example for RFC 5280/PKIX (Certificate) 2008 # Decode this buffer, or choose your own message # with a corresponding base64 encoding # -----BEGIN CERTIFICATE----- MIIFCDCCA/CgAwIBAgISESFhQR7493fnRxmivJ8EucZRMA0GCSqGSIb3DQEBBQUA MFcxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMS0wKwYD VQQDEyRHbG9iYWxTaWduIERvbWFpbiBWYWxpZGF0aW9uIENBIC0gRzIwHhcNMTIx MjAzMTI0OTUwWhcNMTMxMjA0MTI0OTUwWjBSMQswCQYDVQQGEwJGUjEhMB8GA1UE CxMYRG9tYWluIENvbnRyb2wgVmFsaWRhdGVkMSAwHgYDVQQDExd3d3cubWFyYmVu LXByb2R1Y3RzLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAO5n g6qph9vjXPHPqYLAI5q7oqxOI685uakldSc4W/hh4Aku6ACGiN/53znZMPGFcq9e /c654eB3dyjaTk2zeEuoXjEh8WUG5iLdfTjGeTYOYg0b/b4Hg78KMz40LzuM5+5O WerYYPqS4QYewfWqSgqLyt+NnmK8XjnwXE4gVKU//chf+q0/7smo9RL23sAKOb3S KdQy7QbvyZ4u8sP+WjcP7CJ8gbanug85ZTdiVtR/+blPfkVU0aVKo42b1U1K5WKZ f+4hVuTlAwPHVx+N7O1zx80pX+XhPmu8Cb34yVSRO9B0rGt9ocThPJjKxov9UHUV 9Y/spmS7Vb/Ym/mi0NUCAwEAAaOCAdEwggHNMA4GA1UdDwEB/wQEAwIFoDBMBgNV HSAERTBDMEEGCSsGAQQBoDIBCjA0MDIGCCsGAQUFBwIBFiZodHRwczovL3d3dy5n bG9iYWxzaWduLmNvbS9yZXBvc2l0b3J5LzA3BgNVHREEMDAughd3d3cubWFyYmVu LXByb2R1Y3RzLmNvbYITbWFyYmVuLXByb2R1Y3RzLmNvbTAJBgNVHRMEAjAAMB0G A1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjA/BgNVHR8EODA2MDSgMqAwhi5o dHRwOi8vY3JsLmdsb2JhbHNpZ24uY29tL2dzL2dzZG9tYWludmFsZzIuY3JsMIGI BggrBgEFBQcBAQR8MHowQQYIKwYBBQUHMAKGNWh0dHA6Ly9zZWN1cmUuZ2xvYmFs c2lnbi5jb20vY2FjZXJ0L2dzZG9tYWludmFsZzIuY3J0MDUGCCsGAQUFBzABhilo dHRwOi8vb2NzcDIuZ2xvYmFsc2lnbi5jb20vZ3Nkb21haW52YWxnMjAdBgNVHQ4E FgQU5nVzhf71CX/ZenHFpqpmHBIWw1kwHwYDVR0jBBgwFoAUlq36sFu5g2QqdsIc imnaQtz+/SgwDQYJKoZIhvcNAQEFBQADggEBABd1BSpCQRh2Q3/hv30G+kXhQEM9 7oC19iBPdLCJ58sp0icz26LYEMjbBxu9WFcaSBOvrjReW7Cs0mU1cas8yQUh2Ikw SoHAN7yglept8LvjzKsD2gl5pvmlt6h5vRhCDSEFTqOaPZqiwzzRy9xdPt3xjzD8 lwsQs043pOHczlBDlZ05lTCPH1C7yrspa7QQBQwmnuppPb3Dooqm/VJX165zx648 EEcpfMWVwaE3qKCCjmLS6wRBybFdI8MC5RuXePqzN6V+r5D50vqa44Il3Udr+PiU vBt0lxXQLFPsPUxDreVABKCNemAOJqw1jLubYQ9DMO8eTG7JpxabuezwAEw= -----END CERTIFICATE-----

THIS FREE ONLINE ASN.1 DECODER SERVICE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. MARBEN PRODUCTS SHALL HAVE NO LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IN ANY WAY RELATED TO THE USE OF THIS SERVICE, REGARDLESS OF WHETHER THE CLAIM FOR SUCH DAMAGES IS BASED IN CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. IN NO EVENT SHALL MARBEN PRODUCTS BE LIABLE FOR ANY LOSS OF PROFITS OR OTHER SPECIAL OR CONSEQUENTIAL DAMAGES, EVEN IF MARBEN PRODUCTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

(*) We're constantly adding and updating the ASN.1 interfaces. Do not hesitate to contact us if you need other ASN.1 interfaces.