Tag: security

smartcard world

smartcard steps

admin

creating objects AMR cmd

  • DataAccessRightTemplate
  • creating All enum values for reducing lines of code
  • object with several keys
  • diff data
  • selection of different levels gd and ad
  • exception catcher for not implemented parts
  • authentication squence more or less unclear
  • changing access rights for according hex tag hex hex

steps contd

  • remove try catch blocks
  • remove pragma directives
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smartcard world

smart card encryption FAQs

admin

see a task, pick it, and start by step 0:

IFD

ICC Reader Device (IFD)

http://pcscworkgroup.com/Download/Specifications/pcsc4_v2.01.01.pdf

general authenticate

The GENERAL AUTHENTICATE command is used to establish a Secure Channel session, according to Secure Channel Protocol '03' described in GPCS Amendment D [Amd D].

symmetric key

ISO/IEC 11770-2:2018
https://www.iso.org/standard/73207.html

apdu

https://en.wikipedia.org/wiki/Smart_card_application_protocol_data_unit

RND

RND.IFD and RND.ICC are each 16 Bytes

A.IFD

A.IFD = RND.IFD || RND.ICC etc

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Uncategorized

tearing smartcard RF power

admin

tearing power from cards during command execution. Keolabs SPulse option triggered by Command PCD_EOF triggers RF_POWER output, cycles parameter to align tearing moment.

keo.Spulse.LoadSpulseCsvFile(filepath, fdt, (uint)eFrameTypeFormat.FRAME_TYPE_SPULSE, (uint)eEmulatorLoadSpulseMode.STAND_ALONE);
keo.Spulse.EnableSpulse((uint)eEmulatorSpulseEvent.SP_PCD_EOF, (uint)eEmulatorSpulseOutput.SP_RF_POWER);
keo.Reader.ISO14443.SendTclCommand(0x00, 0x00, ref txBuffer[0], (uint)txBuffer.Length, out rxBuffer[0], (uint)rxBuffer.Length, out rxBufferLength);
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Uncategorized

homomorphic encryption

admin

https://www.techtarget.com/searchsecurity/definition/homomorphic-encryption

quote: "

Homomorphic encryption is the conversion of data into ciphertext that can be analyzed and worked with as if it were still in its original form.  

Homomorphic encryptions allow complex mathematical operations to be performed on encrypted data without compromising the encryption. In mathematics, homomorphic describes the transformation of one data set into another while preserving relationships between elements in both sets.  The term is derived from the Greek words for "same structure." Because the data in a homomorphic encryption scheme retains the same structure, identical mathematical operations -- whether they are performed on encrypted or decrypted data --  will yield equivalent results.

Homomorphic encryption is expected to play an important part in cloud computing, allowing companies to store encrypted data in a public cloud and take advantage of the cloud provider’s analytic services.

Here is a very simple example of how a homomorphic encryption scheme might work in cloud computing:

  • Business XYZ has a very important data set (VIDS) that consists of the numbers 5 and 10.  To encrypt the data set, Business XYZ multiplies each element in the set by 2, creating a new set whose members are 10 and 20.
  • Business XYZ sends the encrypted VIDS set to the cloud for safe storage.  A few months later, the government contacts Business XYZ and requests the sum of VIDS elements.   
  • Business XYZ is very busy, so it asks the cloud provider to perform the operation.  The cloud provider, who only has access to the encrypted data set,  finds the sum of 10 + 20 and returns the answer 30.
  • Business XYZ decrypts the cloud provider’s reply and provides the government with the decrypted answer, 15.

"

there is a python lib PySEAL

https://gab41.lab41.org/pyseal-homomorphic-encryption-in-a-user-friendly-python-package-e27547a0b62f

https://blog.openmined.org/build-an-homomorphic-encryption-scheme-from-scratch-with-python/

https://bit-ml.github.io/blog/post/homomorphic-encryption-toy-implementation-in-python/

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