SOC1 Caesar Cipher: 

Level 1 (30 mins)

A substitution cipher that shifts the alphabet by a set number.

SOC2 Swizzle Stick: 

Level 1 (30 mins)

A Hebrew cipher that reverses the alphabet for encryption

SOC3 Pigpen Cipher: 

Level 1 (60 mins)

Uses a grid and symbols for substitution.

SOC4 Rail Fence Cipher: 

Level 1 (60 mins)

A simple transposition cipher writing messages in a zigzag.

SOC5 Simple Substitution Cipher: 

Level 1 (60 mins)

Substitutes each letter with another letter.

SOC6 Dot Code:

Level 1 (30 mins)

Uses dots to represent different letters.

SOC7 Invisible Ink: 

Level 1 (30 mins)

Writing with a substance that becomes visible under certain conditions.

SOC8 Knot Code: 

Level 1 (30 mins)

Uses knots in a rope or string to encode messages.

SOC9 Scytale:

Level 1 (60 mins)

An ancient cipher using a rod to transcribe messages on a strip of parchment.

SOC10 Crease Code:

Level 1 (30 mins)

Fold a paper and reveal code along the vertical creases

SOC11 Playing Card Code:

Level 1 (30 mins)

An ordinary deck of playing cards holds the code

SOC12 Telephone Dial Code:

Level 1 (30 mins)

This uses a telephone dial to provide an alphabet key.

SOC13 Checkerboard:

Level 1 (60 mins)

A cipher that uses a checkerboard pattern to encode messages.

SOC14 Triangle Code:

Level 1 (30 mins)

Utilizes geometric shapes to create a coded message.

SOC15 Date Shift Ciphers:

Level 1 (30 mins)

Uses dates as a mechanism to shift letters for encryption.

SOC16 Polybius Square:

Level 1 (30 mins)

The Polybius Square is a 5x5 grid containing all the letters

SOC17 Book Cipher:

Level 1 (60 mins)

Uses a book to encode messages based on page, line, and word number.

SOC18 Bacon's Cipher:

Level 1 (30 mins)

A form of steganography using variations of typeface to hide a message.

SOC19 Vigenère Cipher:

Level 1 (30 mins)

A polyalphabetic cipher using a keyword to create multiple Caesar ciphers.

SOC20 Grille Cipher:

Level 1 (30 mins)

Uses a card with holes cut out to reveal parts of a message.

SOC21 One-time Pad:

Level 1 (60 mins)

A theoretically unbreakable cipher with a key as long as the message.

SOC22 Alberti Cipher Disk:

Level 1 (30 mins)

A polyalphabetic cipher using a rotating disk to shift letters.

SOC23 Null Cipher:

Level 1 (30 mins)

A steganographic technique where the plaintext is hidden within a larger, innocuous-looking text

SOC24 Playfair Cipher:

Level 1 (30 mins)

Encrypts pairs of letters, harder to decipher than simple ciphers.