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A cipher is a simple method of modifying messages to make them unreadable except to readers who know the key. Common ciphers are Caesar, Vigenere, Atbash, and several types of substitution cipher. Other ciphers include polygraphic ciphers such as Playfair and Foursquare and numerical ciphers such as Polybius and Nihilist. Cipher puzzles sometimes make use of data encodings like Morse, Binary, or Base64.

10 votes
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Help, what is Sistek saying?

I guess the answer is The cipher Then The deciphering works The decrypted messages are, in order: Day 1 message 1: Day 1 message 2: Day 1 message 3: Day 2: Day 3: How I found …
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21 votes
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Message from deep negative space

Let us giving us the quote
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8 votes
Accepted

The physicist's puzzle

You can find the solution to the nonogram in Anonymous' answer. For the rest
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10 votes
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PSE Advent Calendar 2021 (Day 12): Christmas Confusion

I'm guessing your Christmas present will be Zizy Archer has solved part 1 giving the order Now, these gifts So, now we should have enough information to deduce the arrangement!
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11 votes
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Kind of like a clock, kind of like a path…

The final phrase is Starting with the nonogram
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6 votes
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A sudokey and 14 messages

Parts 1-3 were first solved by Alaiko Part 1 Part 2 Part 3 Part 4 Part 5
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