Discovering the Hashing Algorithm Used: A Guide

Keep in mind that some applications may implement it differently: encode the hashes before saving them (e.g. ) – decoding common schemes can be achieved with on of the many freely available tools e.g. the MD5 hash of “12345” encoded in Base64 is multiple hashing algorithms (e.g. ) – find out one at a time […]

Security measures for the lock bytes of NTAG216

After completing the authentication process, proceed to write the tag page-by-page. You may need to write pages 4 and onwards, which contain the NDEF message wrapped in a TLV structure with the tag. Additionally, you may need to make changes to the capability container on page 3. The four byte data value should be written […]

Data in OpenSSL Exceeding Modulus Length

One possible solution is to use asymmetric RSA keys. However, it is important to note that these keys have limitations in terms of the length of data they can encrypt/decrypt. For instance, the RSAES-PKCS1-v1_5 encryption scheme defined in RFC3447 can only handle messages up to k – 11 octets in length (where k is the […]

Unveiling the Contents of .png and .jpg Files

The website http://calendar.perfplanet.com/2010/png-that-works/ provides more comprehensive guidance and a wider range of png compression and quantization tools than this page. As for Solution 3, it should be noted that PNG does not actually support indexed images with a full alpha channel. Rather, it allows for the inclusion of colors with alpha values in the color […]

Is it possible to use a 192-bit key for DUKPT BDK?

The second solution involves using DUKPT, which has two variations. The first one, 3DES-DUKPT, generates keys using the 3DES algorithm but does not use it for encrypting or decrypting data. The second variation, AES-DUKPT, uses the AES-ECB mode for key generation. It is important to note that every key in this algorithm, including BDK, device […]

Techniques for encrypting a password that is stored in a database and can be decrypted later

Given that the vault is encrypted using a plain master password, you have the flexibility to employ any encryption/decryption technique to encrypt the master password (which will be stored using an API) and decrypt the stored encrypted password (since decryption is necessary to obtain the plain master password for verification). Now, what confuses me is […]

Understanding the Purpose of IPEK in DUKPT

As I explore the DUKPT (Derived Unique Key Per Transaction) system utilized in PIN devices, my focus is on the IPEK and its role. My current project requires the creation of a BDK for POS transactions. Question: As I delve into the DUKPT (Derived Unique Key Per Transaction) approach employed in PIN devices , my […]

How is 4G LTE encrypted?

To prevent legacy authentication, there are two approaches: direct and indirect blocking. The most straightforward method is to set up a Conditional Access policy that targets legacy authentication clients and denies access. Initially, customers can opt to disable basic authentication for specific protocols by implementing Exchange Online authentication policies. Then, when they are ready, they […]