In cryptography, WAKE is a stream cipher designed by David Wheeler in 1993.

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WAKE stands for Word Auto Key Encryption. The cipher works in cipher feedback mode, generating keystream blocks from previous ciphertext blocks. WAKE uses an S-box with 256 entries of 32-bit words.

The cipher is fast, but vulnerable to chosen plaintext and chosen ciphertext attacks.^[1]

• TEA, XTEA