Final answer:
To grep a Voyager credit card number ending in a 1 in FTK, one must use a regular expression in the grep command that looks for a string of 12 digits followed by a 1, after knowing the IIN specific to Voyager cards. It is advised to ensure the legality of this operation by respecting data protection laws.
Step-by-step explanation:
To generate an expression of a Voyager credit card number ending in a 1 using FTK (Forensic Toolkit), you need to be familiar with the structure of credit card numbers and regular expressions. Voyager credit cards are not as commonly referenced as Visa, Mastercard, or American Express, so it is important to know that Voyager numbers typically fit into the travel/entertainment category of cards. This could mean that they have a certain pattern similar to these types of cards.
Voyager cards generally follow the industry standard of a six-digit Issuer Identification Number (IIN), followed by a variable length of account number which could go up to 12 digits, making the total length of the card number 18 digits. Since Voyager cards are rare, you might not have a specific regular expression for them. However, if you know the IIN (first six digits) specific to Voyager, you can build a regular expression like so:
grep '[0-9]{12}1' file.txt
This command assumes the IIN plus account number has a total length of 18 digits and searches for any string of 12 digits followed by a 1, which represents a card ending in 1. Make sure to replace '[0-9]{12}1' with the pattern specific to the credit card IIN for Voyager cards if it's known. Also, replace 'file.txt' with the actual file you are searching. Be aware of data protection laws and ensure you have legal authority to search for this credit card information.