Take each number mod 41 and find the modular inverse for the result. Then map to the following character set: 1-26 are the alphabet, 27-36 are the decimal digits, and 37 is an underscore.
Wrap your decrypted message in the picoCTF flag format (i.e. picoCTFdecrypted_message)
It is possible to mark resource outputs as containing secrets. In this case, Pulumi will automatically treat those outputs as secrets and encrypt them in the state file and anywhere they flow to. To do so, use the additional secret outputs option.
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By default, configuration values are saved in plaintext. To explicitly denote a plaintext or unencrypted configuration value, pass the --plaintext flag. This flag can be used to indicate that you did not want an encrypted secret.
If you run this command several times, you will notice each invocation returns different values ! That's because, in the absence of the -d flag, openssl enc does encryption and generates a random salt each time. Since the salt varies, so do the key and IV. Thus, the -P flag is not very useful when encrypting; the -p flag, however, can be used. Let's try again; this time, we have the file foo_clear which we want to encrypt into foo_enc. Let's run this:
which will print the same salt, key and IV as above, every time. How so? That's because this time we are decrypting, so the header of foo_enc is read, and the salt retrieved. For a given salt value, derivation of the password into key and IV is deterministic.
Alternatively, you can specify the salt value with the -S flag, or de-activate the salt altogether with -nosalt. Unsalted encryption is not recommended at all because it may allow speeding up password cracking with pre-computed tables (the same password always yields the same key and IV). If you provide the salt value, then you become responsible for generating proper salts, i.e. trying to make them as unique as possible (in practice, you have to produce them randomly). It is preferable to let openssl handle that, since there is ample room for silent failures ("silent" meaning "weak and crackable, but the code still works so you do not detect the problem during your tests").
The process by which the password and salt are turned into the key and IV is un-documented, but the source code shows that it calls the OpenSSL-specific EVP_BytesToKey() function, which uses a custom key derivation function (KDF) with some repeated hashing. This is a non-standard and not-well vetted construct (!) which relies on the MD5 hash function of dubious reputation (!!); that function can be changed on the command-line with the undocumented -md flag (!!!); the "iteration count" is set by the enc command to 1 and cannot be changed (!!!!). This means that the first 16 bytes of the key will be equal to MD5(passwordsalt), and that's it.
Chromium has a similar reader mode to Firefox. In this case it is called DOM Distiller, which is an open source project.It is disabled by default, but can be enabled using the chrome://flags/#enable-reader-mode flag, which you can also make persistent.Not only does DOM Distiller provide a better reading experience by distilling the content of the page, it also simplifies pages for print. Even though the latter checkbox option has been removed from the print dialog, you can still print the distilled page, which basically has the same effect.
In multi-GPU systems, Chromium automatically detects which GPU should be used for rendering (discrete or integrated). This works 99% of the time, except when it does not - if a unavailable GPU is picked (for example, discrete graphics on VFIO GPU passthrough-enabled systems), chrome://gpu will complain about not being able to initialize the GPU process. On the same page below Driver Information there will be multiple GPUs shown (GPU0, GPU1, ...). There is no way to switch between them in a user-friendly way, but you can read the device/vendor IDs present there and configure Chromium to use a specific GPU with flags:
As of 2020.04.20 if you run chromium with --remote-debugging-port=9222 flag for web development, you cannot log in to your Google account. Temporarily disable this flag to login and then you can enable it back.
There are five cosmetic rewards to be earned by completing these Fortnite quests, and as two of them can only be claimed by clearing the encrypted Cipher Quests it pays to know exactly what they mean. If you're ready to crack the code, or just want to read ahead to find the answers, then here's how to decode and complete all of the encrypted Cipher Quests in Fortnite.
The encrypted Cipher Quests in Fortnite are written in a substitution cipher, as hinted in a teaser posted by Epic where "3 18 1 3 11 20 8 5 3 15 4 5" becomes "CRACK THE CODE" if you use 1=A, 2=B etc. However, the actual code used for the encrypted Cipher Quests has additional complexity as it is being offset by the digits 0.3.1.0.2.0.2.3 repeating on a loop, so you need to take those numbers off the digits in the code before converting it back to letters. Using 1.17.23.9.14. 19.19.24.1.21.6 from the first quest as an example to explain this:
Head to Lonely Labs in the northeast corner of the island, then look at the shipping containers next to the Fortnite Capture Point flag. You'll see that one of them (marked below) is sticking into a snowbank, and if you go through it you'll find stairs leading down to a secret bunker. Go down there and interact with any of the computer units to complete the third stage of this quest.
Make your way to the northwest end of Shattered Slabs, where you'll see a series of sections cut into the hill with a small cave-like opening at the top. Enter that to find a small glowing mound on the floor, then hit it with your harvesting tool to pop an arcade machine out of the ground, completing the fourth and final stage of this quest.
By completing Fortnite Cipher Quests, both unencrypted and encrypted, you'll unlock various reward items for your locker, and there's an additional item that will be awarded by beating a specific encrypted Cipher Quest in Faulty Splits. Those rewards are:
There is no simple method or tool to undo this. With some knowledge about how Linux systems work, it can be done. You'd have to move the whole file system (or all files) to another partition (with enough free space) or external HDD. Then, remove the encrypted container, and recreate the file system without encryption. Finally, make sure that the new file system is properly recognized by the boot loader and mount -a before rebooting.
PS: Chances are that you can change the encryption passphrase, possibly to an empty string. Then decrypting only requires to press Enter. Maybe you can go further and supress to (now useless) passphrase prompt. However, this does not disable the encryption. The data would still be encrypted although the encryption would be useless since the key can be trivially guessed.
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