Procurement process
There is 3 parts in the procurement process of SIM cards. We need a transport key (for encryption) & an input file with production data, SIM card graphics (optional) and a purchase order.
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Encrypt the input file with Smartjac’s Public PGP key [Customer]
- Use Smartjac public PGP key to send an encrypted text file with IMSI range, OP and transport key. OpenPGP uses private and public keys, and only the private Key in our secure possession can decrypt messages encrypted with our public key.
The transport key included in the input file will be used to encrypt the output file containing IMSI, Ki, and other values. The text file can have the content formatted like this before encryption, where T-key is the AES password:
**********************************************
* HEADER DESCRIPTION *
**********************************************
Customer: ACME INC
Quantity: 100
**********************************************
* INPUT VARIABLES *
**********************************************
IMSI: 333222123456789-333222123456888
OP: 00112233445566778899AABBCCDDEEFF
T-Key: AB12#%fg-SdfG598237
- T-key, the transport key is any kind of alphanumeric password
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Encrypting the output file with the transport key [Smartjac]
.
- AES-256-ECB encryption will be used to encrypt the output file with the transport key
The output file will be a simple csv file containing the values required by the customer, for example only:
IMSI,Ki
Or in a more complex scenario:
ICCID,IMSI,Ki,OPc,GPIN,LPIN,PUK,IMPI,IMPU, etc
Openssl , https://www.openssl.org , can be used for encryption and decryption purposes for the output file.
openssl enc -aes-256-ecb -in output.csv -out output.enc
enter aes-256-ecb encryption password: *******
Verifying - enter aes-256-ecb encryption password: *******
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Sending the encrypted output file to the customer [Smartjac]
As the file is encrypted with strong encryption it can be sent with e-mail
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Decrypting the output file with the transport key [Customer]
openssl enc -aes-256-ecb -d -in output.enc -out output.csv
enter aes-256-ecb decryption password: *******
**********
PGP
Attached you'll find our PGP public key
Smartjac Nordic AB <This email address is being protected from spambots. You need JavaScript enabled to view it.> (F5C64982C40417E4)
You may also find and verify/compare our key on these locations:
- https://keyserver.pgp.comsearching for This email address is being protected from spambots. You need JavaScript enabled to view it.
- https://smartjac.biz/index.php/support(our official product site)
You can use this key to encrypt and secure files and messages you send to us.
To start using it, you'll need to install an OpenPGP software on your computer. Below you'll find a list of possible solutions for your operating system:
macOS https://gpgtools.org/#gpgsuite
Linux https://ssd.eff.org/en/module/how-use-pgp-linux
Windows https://www.gpg4win.de/get-gpg4win.html (recommended for ease-of-use)
https://scand.com/products/wingpg/
Please import the public key into your local OpenPGP Key-Manager.
If you require additional security please use a phone to call or use secure messaging with WhatsApp or Signal to exchange the fingerprint of our public Key.
The fingerprint can be retrieved by looking at the details / properties of the public key with the OpenPGP software.
Looking forward to exchange secure messages with you.
Regards
Smartjac Team
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Comment: GPGTools - https://gpgtools.org
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=jOBj
-----END PGP PUBLIC KEY BLOCK-----