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QCE Digital Solutions Unit 4 · Modules 17–88

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A free printable QCE Digital Solutions Unit 4 crossword with 10 clues, built from the key terms of Digital Methods for Exchanging Data (Modules 17–88) — Gronsfeld cipher, One-time pad, Block ciphers and key size, DES, Triple DES, Blowfish and more. Print it or save it as a PDF — the answer key starts on its own page. No login needed.

QCE Digital Solutions Unit 4 Crossword: Digital Methods for Exchanging Data (Modules 17–88)

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Crossword

Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.

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8

Across

  1. 3. A symmetric block cipher and Blowfish's successor. It encrypts 128-bit blocks with keys up to 256 bits and was a finalist in the competition that chose AES. (7)
  2. 5. Every packet is confirmed as received (acknowledged). Missing or damaged packets are resent so no data is lost, but waiting and resending adds extra delay. Word 2 of: guaranteed ________ (8)
  3. 6. ______ first, then ______, and hash to check integrity. Encrypted data looks random so it cannot be compressed. On receiving, reverse the order: decrypt, then decompress. Word 1 of: ________ then _______ (8)
  4. 8. Word 3 of the term in 6 Across: ________ then _______ (7)

Down

  1. 1. A fast symmetric block cipher with a variable-length key (up to 448 bits) and 64-bit blocks. It is free for anyone to use, as it is in the public domain. (8)
  2. 2. The variation in latency between packets, so they arrive at uneven intervals. Measured in milliseconds, it disrupts voice and video unless a ______ buffer smooths it. (6)
  3. 3. Encryption using a truly random key as long as the message, used only once. Never reused, it is unbreakable in theory, but the pad must be shared securely. Word 2 of: ___-____ pad (4)
  4. 4. Applies DES three times (encrypt, decrypt, encrypt) with two or three keys to lengthen the effective key and strengthen DES. It is slower than AES. Word 1 of: ______ ___ (6)
  5. 5. Data Encryption Standard: an early symmetric block cipher using 64-bit blocks and a 56-bit key. Now insecure because modern computers can brute-force its small key. (3)
  6. 7. Word 1 of the term in 3 Down: ___-____ pad (3)

Answer Key

QCE Digital Solutions Unit 4 · Modules 17–88
1B
L
2J
3T
W
O
F
I
S
H
I
W
T
4T
M
F
T
R
5D
E
L
I
V
E
R
Y
I
E
S
R
6C
7O
M
P
R
E
S
S
H
N
L
E
8E
N
C
R
Y
P
T
Across
3TWOFISH — A symmetric block cipher and Blowfish's successor. It encrypts 128-bit blocks with keys up to 256 bits and was a finalist in the competition that chose AES.
5DELIVERY — Every packet is confirmed as received (acknowledged). Missing or damaged packets are resent so no data is lost, but waiting and resending adds extra delay. Word 2 of: guaranteed ________
6COMPRESS — ______ first, then ______, and hash to check integrity. Encrypted data looks random so it cannot be compressed. On receiving, reverse the order: decrypt, then decompress. Word 1 of: ________ then _______
8ENCRYPT — Word 3 of the term in 6 Across: ________ then _______
Down
1BLOWFISH — A fast symmetric block cipher with a variable-length key (up to 448 bits) and 64-bit blocks. It is free for anyone to use, as it is in the public domain.
2JITTER — The variation in latency between packets, so they arrive at uneven intervals. Measured in milliseconds, it disrupts voice and video unless a ______ buffer smooths it.
3TIME — Encryption using a truly random key as long as the message, used only once. Never reused, it is unbreakable in theory, but the pad must be shared securely. Word 2 of: ___-____ pad
4TRIPLE — Applies DES three times (encrypt, decrypt, encrypt) with two or three keys to lengthen the effective key and strengthen DES. It is slower than AES. Word 1 of: ______ ___
5DES — Data Encryption Standard: an early symmetric block cipher using 64-bit blocks and a 56-bit key. Now insecure because modern computers can brute-force its small key.
7ONE — Word 1 of the term in 3 Down: ___-____ pad

Modules this crossword covers

Every module has its own free printable worksheet with an answer key, and students can practise the same terms interactively on Cloodit.

Part of: QCE Digital Solutions Unit 4 — Digital Methods for Exchanging Data

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