Block Size: 128 bits
Key Size: 128, 192, or 256 bits
Rounds: 32
Network: Substitution-Permutation
Tiny Encryption Algorithm (TEA) CORRECT ANSWERS: Symmetric Block Cipher
Block Size: 64 bits
Key Size: 128 bits
Cryptography CORRECT ANSWERS: Deciphering secret writings, kryptos means hidden and
grafo means write. Must not be readable by interlopers over secure/hidden communications.
Readable by intended recipients only.
Mono-Alphabet Substitution Algorithms CORRECT ANSWERS: Include Ceasar, Atbash,
Affine and ROT13
Caeser Cipher CORRECT ANSWERS: Is one of the oldest methods, was used by ancient
Romans. Shift of letter. Easy to crack to common words like "A" and "The".
Single Substitution Weakness CORRECT ANSWERS: Using common words (A, THE, OO,
EE) in English Lang to brute force single substitution ciphers.
Null Cipher CORRECT ANSWERS: Hidden message in unrelated text
• The sender and recipient have prearranged to use some pattern, taking certain letters from the
message.
Book Cipher CORRECT ANSWERS: Parties agree on a particular book. Simplest
implementation to send coordinates for words
Rail Fence Cipher CORRECT ANSWERS: Widely known Transposition cipher. Plaintext
written in columns and transposed in rows. Recipient reconstructs the original message
Symmetric Key Cryptography uses two processes CORRECT ANSWERS: Substitution (XOR
the PT with key) and transposition (swapping blocks of text)
DES (Data Encryption Standard) CORRECT ANSWERS: Symmetric Block Cipher
Block Size: 64 bit
Key Size: 56 bit
Rounds: 16 rounds
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