Clean up secret in Radix-64

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Aug 6th, 2022
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How to clean up secret in Radix-64

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hello world welcome back to another imaginary CTF 2024 writeup video in this video weamp;#39;ll be walking through the crypto challenge base 64 letamp;#39;s get into it yet another B 64 decoding challenge okay so I have the files that give you downloaded over here letamp;#39;s go ahead and open this in code okay you have a main.py source code and an out.txt file with the secret key scanning through this main.py script we see that we have a Q being assigned the value 64 and then itamp;#39;s opening the flag file and then converting the flag to a long integer then itamp;#39;s initializing the secret key list and then itamp;#39;s looping through our flag integer and then itamp;#39;s appending to the secret key the flag integer mod Q so the remainder of the flag integer divided by q and then it floor divides the flag integer by q and then it assigns the flag integer to the quotient of that operation so itamp;#39;s clear that we need to reverse this so what Iamp;#39;m going

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Base64 encoding is a text encoding string that represents binary data into an ASCII string, allowing it to carry data stored in a binary format across channels.
Since Base64 uses 24-bit sequences, padding is needed when the original binary cannot be divided into a 24-bit sequence. You have probably seen this type of padding before represented by printed equal signs (=).
Base64 is a scheme for converting binary data to printable ASCII characters, namely the upper- and lower-case Roman alphabet characters (AZ, az), the numerals (09), and the + and / symbols, with the = symbol as a special suffix code. The datas original length must be a multiple of eight bits.
Kubernetes Secrets use base64 encoding to ensure that secret values are stored and transmitted in a safe, human-readable format. In this YAML manifest: - `apiVersion` specifies the Kubernetes API version for secrets.
Base64 is used because some systems are restricted to ASCII characters but are actually used for all kinds of data. Base64 can camouflage this data as ASCII and thus help this data pass validation.
Base64 is a method of encoding binary data as ASCII text. This is necessary for sending files via Internet email, which can only handle 7-bit ASCII text. Base64 is the industry standard format for SSL certificate content.
As we stated earlier, base64 is a binary to text encoding scheme that represents data in ACII string format and then carries that data across channels. If your data is made up of 2⁸ bit bytes and your network uses 2⁷ bit bytes, then you wont be able to transfer those data files. This is where base64 encoding comes in.
Threat actors often disguise malicious scripts in email attachments or share documents infected with malware. One particularly elusive approach is to use Base64 encoding to hide malicious code within HTML content. This article details Base64 encoding as a technique to obfuscate HTML smuggled payloads.

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