DJIGZO S/MIME Email Encryption

DJIGZO S/MIME Email Encryption


(4 stars)


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10,000 - 50,000 downloads

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DJIGZO for Android can be used with your existing Android mail application to send and receive S/MIME signed and encrypted email.


- S/MIME 3.1 (X.509, RFC 3280), email encryption and digital signing
- Can be used with the Android Gmail application
- Compatible with existing S/MIME clients (like Outlook, Thunderbird etc.)
- Message and attachments are encrypted
- HTML email support
- Certificates are automatically extracted
- CRLs supported (LDAP and HTTP)
- Certificate trust lists (CTLs) for black/white listing certificates
- LDAP servers can be searched for certificates
- Can generate self-signed certificates for a 'private-PKI'


- DJIGZO for Android does not provide functionality to retrieve email. An existing Android mail application, for example Gmail, K9 or the default Android email client, should be used to retrieve the encrypted attached smime.p7m message.
- Clear signed digitally signed message can only be verified by opening the message as an .eml file from the sdcard. The complete message is required for validation. Existing mail clients however do not provide access to the complete message.


- The GET_ACCOUNTS permission is required to get the default sender address
- The READ_CONTACTS permission is required to lookup the recipients for the compose page

Some user complain that the app requires the "read call logs" permission. The app does not read the call logs nor does it need access to the call logs. It needs access to the contact list for recipient lookup on the compose screen. The app is built for older Android releases. In older releases of Android there was no "call log" permission (this "permission" was implicitly included with the contact list permission). The call log permission was later added to Android as an explicit permission. To provide backward compatibility, Android implicitly adds the call log permission if the app is built for older Android releases. There is not much we can do about this if we want to support older devices. For more info see


- Quick start guide
- Reference guide

For more information see

For support contact us at


DJIGZO, based in Amsterdam, the Netherlands, provides products for the protection of email. DJIGZO Email Encryption Gateway is an open source centrally managed email server that encrypts and decrypts email at the gateway level.

Installation packages are available for Ubuntu, Debian, Red Hat and CentOS. A Virtual Appliance for VMware and Hyper-V is available. An add-on for BlackBerry is available.

Feedback on some reviews:

DJIGZO is fully functional and has been tested on the Galaxy tab despite Mr Croucher negative and false claims. The reason he could not import the keys was that he didn't understand the difference between private keys and certificates and kept on trying to import a .pfx file with the certificate import wizard (which is only for importing certificates, not keys).

Paula reported that she couldn't find any certificates. DJIGZO cannot "automagically" find all externally used certificates. There are three ways to get certificates for recipients: extracted from digitally signed email, manual import or, a certificate can be downloaded from an LDAP server. If a company uses their own LDAP server, add the LDAP server to the list.

About the integration of DJIGZO and email clients. DJIGZO registers itself as an application to handle S/MIME attachments (smime.p7m). If a mail application can download the smime.p7m attachment, it can be decrypted by DJIGZO. Most Android email clients cannot be extended by external apps. Improved integration between existing email clients and DJIGZO can only be done if the email client supports plugins.

Tags: s/mime signed email, s/mime, smime email, s/mime google, djigzo s/mime email encryption, smime, djigzo errors, djigzo for blackberry 6.0, djigzo exchange, djigzo email encryption.

Recently changed in this version

The previous security fix (see below) did not work on some devices (some devices did not allow writing to /dev/urandom). This will now be handled gracefully.

Important Security Fix:

The default secure random generator provided by Android contains a bug which makes the generated random numbers not random enough. A fix has been added to fix this problem. For more information see:

Comments and ratings for DJIGZO S/MIME Email Encryption
  • (67 stars)

    by Marquise Richardson on 28/06/2014

    The interface really needs a redesign, I also changed the paraphrase timeout and it often resets back to 60 seconds. After a message is sent it should go back to the main screen not stay in compose.

  • (67 stars)

    by Wm Eckert on 19/06/2014

    Whose fault? Comodo? No documentation about Chrome and Android. Google? Chrome doesn't export a certificate on my tablet, the cutesy certificate installer says it installed, but doesn't show up anywhere. Or the app? Comodo is more or less the name of the free cert game, but there is no documentation of how to get their cert and install. Whole afternoon wasted in failure.

  • (67 stars)

    by Mohammed Jowardhar on 26/03/2014

    I'm very pleased with the ease and user friendly secured app. Thanks to the Dev Team.

  • (67 stars)

    by kiti sisi on 06/12/2013

    Work perfect

  • (67 stars)

    by Jim Ryan on 27/11/2013

    So, when installing it asks for permissions to my call logs. Why would an email encryption program need access to call logs?

  • (67 stars)

    by Richard Holmes on 27/10/2013

    But thats cos ive no business using this i guess. If i cant use ill not. I sent one encrypted to my mum but 2nd time i tried to her it said she didnt have an encryption key do i wanna search? Id already made my own and as said used it once to her?

  • (67 stars)

    by Joseph Kocinski on 18/10/2013

    I'd say "read this NSA"! But it uses RSA. Still a very good app and rather easy to config

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