Which of the following is the most secure form of triple-DES encryption?

The correct answer is A. DES-EDE3. Triple DES with three distinct keys is the most secure form of triple-DES encryption. It can either be DES-EEE3 (encrypt-encrypt-encrypt) or DES-EDE3 (encrypt-decrypt-encrypt). DES-EDE1 is not defined and would mean using a single key to encrypt, decrypt and encrypt again…

Submitted by olafpl· Apr 18, 2026Cryptography

Question

Options

ADES-EDE3
BDES-EDE1
CDES-EEE4
DDES-EDE2

How the community answered

(30 responses)

A
87% (26)
B
3% (1)
C
7% (2)
D
3% (1)

Explanation

Triple DES with three distinct keys is the most secure form of triple-DES encryption. It can either be DES-EEE3 (encrypt-encrypt-encrypt) or DES-EDE3 (encrypt-decrypt-encrypt). DES-EDE1 is not defined and would mean using a single key to encrypt, decrypt and encrypt again, equivalent to single DES. DES-EEE4 is not defined and DES-EDE2 uses only 2 keys (encrypt with first key, decrypt with second key, encrypt with first key again).

Topics

#Cryptography#Triple DES (3DES)#Symmetric Encryption#Encryption Modes

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