00586pam a2200205 a 4500 1478979 20250122000151.0 871109s1988 enk b 001 0 eng 9780198532873 (pbk.) DLC DLC DLC 652.8 WEL Welsh, Dominic Codes and cryptography / Dominic Welsh Oxford, Oxford University Press, 1998. ix, 257 p. ; 24 cm. Ciphers. Cryptography. ddc BK 122607 122607 0 0 ddc 0 0 SIAS SRICITYLIB SRICITYLIB 2025-01-22 Krishna Books - KBD/24-25/15523/06 8871.70 1 652.8 WEL K17840 2026-03-10 21:22:45 2026-03-10 2025-01-22 BK